Lexus IS 2014+ :: Momentary Loss Of Acceleration - Collision Detection System
Twice now I've been driving and there was a few second lull where pressing the gas did nothing. The first time I was passing a car on the right, and the other I was pulling out between two cars to make a left on a busy road. Is there some kind of collision detection system that's causing the loss of acceleration? It's odd that the 2 times it happened I was so close to other vehicles. It's concerning since I needed to pull out quickly the second time and I was stuck for a few seconds without acceleration.
View 11 RepliesPassat (B5) :: V6 Tiptronic - Momentary Loss Of Power
2001.5 V6 Tiptronic ... A few times in the last couple of months I've felt what I think is a quick lapse in power, like 1 sec. or less. I say "think" because sometimes a bump in the road, traction related, or some other perceived issue can feel strange, especially when cruising along on a smooth cruise-controlled drive.
Each time this has occurred I've been in cruise control, freeway driving, relatively low speeds (65 MPH) . No other signs of anything wrong, chimes, flickering lights, vibration, nothing.
I can't be sure this time around but it seems in the past it's been on the same stretch of freeway, perhaps the same spot. In other words perhaps just a subtle anomaly in the road ...
Jetta - Volkswagen :: 2011 TDI - Momentary Loss Of Power
I have had the car sense it was brand new and sense I have had it I have had this problem. I mostly notice a problem soon after starting the engine up and come to a stop, but is not limited to that all the times. When I come to a stop the car will feel like it is struggling to maintain an idle as I sit at the light or stop sign and it will actually shake the car a bit. I have noticed when it does do this the fan is on and it might be related to having the alternator trying to keep up with power draw.
I have noticed a loss of power when I am driving down the road it will cut out for maybe a half a second and come back. Usually doesn't happen more than once in one trip. I have brought it to the dealership multiple times to try and see if the can hunt down a problem but it keeps coming back with a clean bill of health. So my question is it something that is normal with diesel engines or is it something that I should take a further look at.
And while on the topic of diesel engines, my uncle a mechanic for diesel engines suggested that I spray a small amount of propane into the air intake to burn up sludge to keep the engine relatively clean. Need to get second opinion of that idea before I try it?
2000 GMC Jimmy - Loss Of Power / Hard Acceleration
I have a 2000 gmc jimmy 300.000 km 4.3 vortec .starts ok, even when cold idle smooth but when I accelerate past 2000 rpm it has a complete loss of power. I bought a fuel pressure tester key on 2 seconds 60 psi when I start the vehicle and running 55 psi. I took it on a road test it stays at 55 psi and has a hard acceleration and will go to 60 psi ,and then starts to break up my first question is how can I block off the return line to the tank, there's no rubber hose in any of the connections just steel lines and hard plastic with push connectors, is there a plug that you can buy or how I can block off the return to see if the pump will build pressure to 75 psi to 80 psi will this will tell me whether the pressure regulator is faulty or the fuel pump needs to be replaced.
I have a manual its a Haynes for chevy blazer gmc from 95 to 2004 it says with central sequential fuel injections (csefi) key on engine not running it should be approx 55-61 psi the engines running at idle it should decrease through 3 to 10 psi according to this manual i am within range but i have read on other posts that it should be 60-65 would you say that my 55 psi reading is okay? or should it be 60-65? also when i blocked the return line should i get a reading of 75 or higher? if the reading goes up does that mean that the fuel regulator is faulty? and if it doesn't go up does that confirm that the fuel pump is the issue?
Santa Fe (CM - 2007-12) :: 2009 - Momentary Power Loss While Driving
The car started rough idling and a few weeks ago while driving "lost power" momentarily. I went to take a look at it and even just idling it will randomly drop 1000 rpm, or when the gas is one in P it does the same thing. also the dash lights dim at the same time.
I pulled these codes (below). I cleared the codes and tried to replicate with no luck. The car had been sitting in a parking lot outside for a few days and it has been -15C. I asked if it seemed to only happen when it was warm (the week before it was +10C) and they said yes. It has been another week (still cold) and the codes have not returned.
Quick google of these codes suggests maybe a throttle position sensor and/or loose battery connection.
Ford - Mustang :: Sudden Momentary Loss Of Power When Accelerating
It did this funny thing about 4-5 times over a span of about 24 hrs before dying and then won't start. It was like hitting the limit on a speed governed car.....sudden momentary loss of power..and it seemed to be when accelerating if that matters. The thing I'm sure of at this point is that the fuel pump is not coming on when the key is turned, I know that sound well, but also checked it at the external connector with a test light for thoroughness. I also found a blown fuse under the hood which coincided with a little smokey smell inside the car when the fuse was replaced and blew again.
There is no spark as well. My Haynes book says that the PCM is behind the passenger kick panel but I only see the eecv and it doesn't smell burnt. The IFS is good. There is power at the coil packs. Fuel pump relay fuse is good. Is it more likely the ccrm since it contains the fuel pump relay and PCM relay or could it still be the eecv? It feels like one part failed but is causing more than one "problem", no power to fuel pump and no spark.
Golf IV / Jetta IV :: 2002 - Acceleration Loss In 5th Gear Around 35 - 45 Mph
I have a 2002 VW jetta 1.8t recently I've noticed that in 5th gear around 35-45 mph its losing acceleration. its a tiptronic so i can just downshift speed up a bit an o to 5th, however I don't want that to be the permanent fix, what this is or why its doing it?
View 1 RepliesChrysler - Towncountry :: 2006 - Hard Starts And Loss Of Power On Acceleration
I have a 2006 town and country with a 3.3 and 220,000 miles.
Last week I was having some hard starts and loss of power on acceleration. My check engine light flashed during one episode so I had autozone check the code and it showed a misfire. I changed out my plugs and wires and that solved my issue. It started and ran like new.
Yesterday, I was running errands and my charging light came on. I was about ten miles from home and I decided to go for it. It was night so the headlights were on. Along the way, everything started to dim. Headlights, dash lights, airbag indicator came on and then the van just died. I walked the final mile and we towed it home.
The alternator and battery were both replaced last year in November making them both one year old. AC Delco battery 660 cca and I had a very reputable alternator shop rebuild the alternator.
So before I towed the van home, I hooked up some heavy duty jumper cables from a running chevy venture and let it charge 15 minutes. After the 15 minutes it was just clicks in rapid succession.
I hooked it up to a trickle charger overnight, 12v 2 amp setting. This morning, the van started, idled fine for about five seconds and then started trying to cut out. I kept it running by giving it gas but after about twenty seconds it stalled. I tried to restart and nothing but the rapid clicks. Three more hours on the trickle charger and the same exact thing happened. It started, began to stall, quit and then wouldn't restart.
I noticed today that the power steering reservoir was leaking a decent amount of fluid down onto everything around it including the coil pack. I replaced this today and used brake cleaner to clean all the surrounding components.
After doing some internet sleuthing, I found a thread with the same problem. For this guy, he had a disconnected ground from the negative battery terminal. I chased mine down (G101) disconnected and wire brushed it all clean. Put it all back together and still the same problem.
Here is what I have discovered:
Trying to jump it from another vehicle only results in the clicks. This is true whether the jumper cables on the dead battery are on both terminals or the negative is grounded on the motor. If the battery were the problem, I should be able to jump through it. If the alternator were the problem, I should be able to start with a jump.
After charging the battery, it will start once but then die soon after. Battery with the key off will read just under 12 volts (11.9, 11.6). With the key on, it will drop to the 8's (8.6, etc.) I have not yet had the battery or alternator bench tested. I plan to start with the battery in the morning.
It seems to me that the alternator wasn't charging the battery or it wouldn't have just killed the battery as those accessories should be powered by the alternator. It shouldn't be a starter issue since it will start after being on the trickle charger.
Lexus SC430 :: 2002 - Intermittent Hesitation Or Stumble / Momentary Power Loss
When I take off from a start it will intermittently stumble or hesitate, seems to be around 1500 rpm. have also noted it at higher speed while cruising. its more like a momentary power cut than a miss fire.
So far I have done the following
new fuel filters
clean MAF
new PCV valve
new spark plugs
check all hoses and plugs etc
injector clean
checked techstream for codes. there is one for a heated O2 sensor but dont think thats it.
2002. SC430
Santa FE SM (2001-06) :: 2004 - Momentary Loss Of Power / Engine Management Light Came On
I have a problem with my 2004 Santa Fe, 2l diesel. Will try to keep this short!
When driving it suddenly 'heaves' (not sure how else to describe it), then it cuts out. I wait about a minute and then it restarts.
At first there was no 'heave' but there would be a momentary loss of power (I thought it was the clutch). Then it progressed to the 'heave' and then cut out, this happened now and then. Very quickly it started to do it every time I drove it. My neighbor mechanic blew down the fuel line, said the fuel pump in tank sounded ok, seemed to do it more when below quarter of tank.
So I kept tank topped up, it seemed ok, then on one 11 mile journey it did it 3 times, the last time the engine management light came on, crawled it home, after which it would not start at all. The computer said it was either fuel rail or coolant sensor. Neighbor replaced coolant sensor, it started ok. Tried it next day - 6 miles and it heaved and cut out again. This time no light coming on.
I've read about cam sensor, crank shaft sensor, fuel pump at back of engine...
Phaeton :: Surging Of Engine / Momentary Loss Of Power At Normal Highway Operating Speeds
The primary electric fuel pump in the fuel tank of my 2004 W12 failed last month, shortly after I had set out on a cross-Canada trip from Vancouver Island to Toronto. The whole process of diagnosing and identifying the cause of the problem, mitigating it so that I could continue the trip, and finally replacing the fuel pump was kind of complex, so, here's the write-up.
The problem presented itself as a surging of the engine - a momentary loss of power - at normal highway operating speeds. The onset was progressive, but it didn't take very long - only about 60 miles of driving - from the first little cough of the engine until total failure of the pump. The first indication was failure of the car to maintain speed (while on cruise control) when climbing hills. That progressed to failure to maintain speed on flat surfaces, and finally led to the car coasting to a stop, engine stalled, at the side of the road.
I soon learned that if I floored the accelerator pedal and held it against the floor, the car would cough and burp for a few seconds, then take off like a rocket. So, for the next 40 miles, I coaxed the car into the next city by flooring it, accelerating to about 80 MPH, then coasting until the speed dropped to 20 MPH, and flooring it once again and accelerating to 80 MPH. Fortunately, I was on a remote road with few other cars, and no police.
I checked the fuses for the two fuel pumps - fuses 34 and 35 in panel C (above the left battery), and they were both OK.
The next day, I visited a VW dealer in the Canadian Rocky Mountains, and together with the parts manager and one of the technicians, we looked at the Self-Study Guides (SSGs) for the Phaeton, and looked at wiring diagrams. Eventually, we came to a tentative conclusion that the primary electric fuel pump in the fuel tank had failed. The SSGs stated that the primary electric fuel pump (the pump on the right side of the car) operates all the time, and the secondary electric fuel pump (the pump on the left side of the car) only operates during starting and during 'periods of high demand'. That made sense to us - the car started fine, and worked OK when the accelerator pedal was held to the floor (high demand). It just didn't work worth a darn at any other time... the engine would stall, or, the car would not accelerate at all.
Here are two illustrations taken from the SSGs that describe how the fuel delivery system works. The first image is taken from the 'Phaeton Overview' SSG, which applies to all vehicles. The second image is taken from the W12 engine SSG. I kind of suspect that all the Phaetons operate in the same way, regardless of engine, because the fuel tank in all the Phaetons has the same shape - two lower lobes, which means two pumps are required.
Descriptions from the SSGs
I think that there may be an error in the description above. My experience suggests that the right hand pump (identified as G6, above) is the primary pump, and the left hand pump (identified as G23) is the one that switches on during starting and periods of high demand. Note also how the identification of G6 and G23 in the illustration above is reversed from what is shown in the illustration below. I believe that the text and illustration below is correct, and the text and illustration above is incorrect.
The 'effects of failure' in the description above would, I believe, make sense if it was the left-hand pump that failed. In my case, the right hand pump failed, and the effects of failure that I experienced were as I set them out in the beginning paragraphs of this post - quite different from the 'effects of failure' of the left hand pump that are described in the SSG above.
After coming to the tentative diagnosis that the primary electric fuel pump (the right hand pump) had failed, we checked the parts stock status in North America. There was one pump in stock, but it was in the United States, and being that it was a Thursday, the pump could not be delivered before the following Tuesday. I didn't want to spend that much time waiting for it, so, we started thinking about other possible solutions.
If we could somehow get the secondary electric fuel pump - the pump on the left side of the car that only operated during starting and heavy demand - to operate, that just might put me back on the road again. So, I removed the plastic cover from the small relay that operates the secondary pump, and wrapped a rubber band around the relay, thus keeping the relay in the closed position. A short test drive proved that this solution worked just fine, the car once again operated normally. The only "problem" was that the last 25% of the fuel in the tank would be unusable, because that fuel would be left behind in the right-hand lobe of the tank - the lobe with the defective primary fuel pump.
Electric Fuel Pump Relays
Here is an illustration from the Phaeton wiring diagrams identifying the various relays above the left battery.
Here you can see the two relays for the electric fuel pumps. They are identical part numbers.
Here you can see the relay for the secondary electric fuel pump, with a rubber band wrapped around it to keep it continually closed.
Aside from the loss of use of the last 25% of the fuel in the fuel tank, the car worked just fine with the secondary electric fuel pump running all the time. There were no problems noted even under heavy acceleration. It was, however, necessary to physically remove the rubber-banded relay from its position in the relay panel whenever the car was shut down for more than half a hour. The power to this relay comes from Terminal 30 (battery direct) - it is not switched on and off with the ignition as Terminal 15 power is. This meant that if the rubber-banded relay was left in position overnight, the left hand battery would totally discharge, because the fuel pump would operate continuously all night. I discovered this the morning after the first night...
So, for the next 8 days, I drove across Canada, removing the relay each night and replacing it each morning. I didn't bother to remove it when I stopped for meals or fuel. The rest of the 3,000 mile trip was uneventful - except once, when I let the fuel tank run down a bit too close to the 1/4 full mark, and the car began surging again because the left hand lobe of the fuel tank (with the functional secondary pump) had emptied out. That was a close call, but I managed to get to a gas station and refuel.
After arriving in Toronto, I called the parts staff at my home VW dealer and ordered a new primary electric fuel pump. I discovered that the left and right hand pumps are slightly different (the various hoses coming out of the pumps are different), and I also discovered that a pump costs about $400. The parts staff suggested I order two seals (one for each side of the tank), because I would have to remove both the right and left fuel tank covers to change the right pump. The seals were not expensive.
Here are two pictures that illustrate where the pumps sit in each lobe of the fuel tank. Note the fuel filler port on the left side of the pictures (as we know, it is on the right side of the car) for orientation.
Phaeton Fuel Tank, showing pumps
Fuel Pump Access Panels
Below is a picture that shows where the access panels to the two fuel pumps are. It's easy to get to these access panels, just remove the carpeted panel from the floor of the trunk.
Here's a close-up of the right side (primary) electric fuel pump access panel.
The instructions (from the VW Repair Manual, or the ELSA / ErWin system) for replacing the fuel pump are quite well written. The repair manual suggests that the fuel tank be drained before replacing a pump. I didn't want to drain the tank, so, I ran the fuel level down as low as I dared (remembering that 1/4 full is effectively 'empty' with a failed primary pump). That proved to be adequate.
There are a heck of a lot of steps involved in disconnecting all the hoses and loosening the various components before the pump can be removed. I strongly suggest that anyone attempting this task have a printed set of instructions before starting disassembly.
The fuel pump has quite a few hoses and connections on it, but fortunately, each connector is unique in design, thus it is not possible to hook things up the wrong way when installing the new pump. It is possible to 'lose' a hose inside the tank... for this reason, I attached a small piece of string to each hose I disconnected from the pump.
The process goes more or less like this:
1) Remove the two 404 relays, to ensure no power is sent to either fuel pump.
2) Lift the rubber cover, and remove the electrical connections from both pumps (left and right).
3) Using a special tool, lift up the three fasteners that hold the cap over top of the access panel (these are NOT threaded fasteners!)
Here is a side view of the three fasteners that hold the plastic cap in place - they are friction fit, not threaded.
4) Now you have a clear view of the access panel. It will probably be dusty and rusty, and should be vacuumed clean before proceeding, to prevent crap from falling into the fuel tank when the cap is removed. The rust is due to condensation forming on the cold metal part whenever the car is filled with cold fuel from an underground storage tank.
5) A special VW tool is used to remove the locking ring from the access panel.
6) After removing the locking ring, I buffed it up with a wire brush to remove surface corrosion.
7) The plastic access cap can now be lifted. There are two electrical connectors on each fuel pump, but three possible fittings on the plastic cap. Fortunately, the three fittings are keyed differently.
8) This is what you see inside the tank after removing the plastic cap.
9) After following all the detailed instructions for disconnecting and stowing hoses, disconnecting the fuel measurement probe from the pump housing, etc., it is possible to lift the pump out. It will be full of fuel.
10) The old and new pumps, side by side. I was very surprised at the amount of crap that was trapped in the filter screen at the bottom of the pump. The car only has 60,000 miles on it, and I have always used premium fuel in it.
11) I was also a bit surprised at the discolouration of the pump components. Below you can see the old and new pumps side by side.
12) It is necessary to get access to the opposite side (in this case, the left side) fuel pump, because hoses from each pump travel horizontally across the tank and connect to the other pump.
13) Here you can see a new hose from the right side pump connecting into a T fitting above the left side pump. It is easy to thread this hose across the top of the inside of the tank.
14) As mentioned earlier, there are three possible fittings on the base of each plastic cap, but only two connectors within the fuel tank. Everything is keyed, thus improper assembly is not possible.
Once the new pump has been installed, the hoses connected, and the fuel measuring probe reset into the side of the new pump, re-assembly of everything is quite straightforward. I replaced the rubber ring around the access panel opening on each side of the tank, and I also buffed up the locking rings using a wire brush (to remove corrosion) on each side.
It was not a pleasant job - your hands get covered in fuel, and there are some hazards associated with working on an open fuel tank with vapour escaping, but it is not a particularly difficult job. It is time-consuming, though.
Golf/GTI VI :: In 3rd Gear Under Hard Acceleration - Fuel Cuts Out
Lately I've been having trouble with my car in third gear under hard acceleration while in tip mode with DSG. I have been Stage 2 since April and it hasn't really been an issue until recently.
The best way I can describe it is when you get into 3rd with your foot on the gas the car stops accelerating and kind of gets stuck. I have to completely let off the gas and before it "wakes up" again. I feel like it's been getting worse in worse, but it only ever happens when I try to push it hard.
No problems in auto mode or sport, it's just a major let down. Could the fuel pump be the culprit? It just feels like the car doesn't want to move for a second or 2, like no response from the gas pedal.
Golf IV / Jetta IV :: GLI 1.8t - Loss Of Power / Misfire Under Acceleration
I have a 04.5 GLI 1.8t, performance mods include, cone filter on the end of my maf, silicone TIP, Forge splitter, 3in custom tbe and unitronics stage 2
I started noticing this problem on the day I got the car tuned, I hadn't noticed it before hand. I replaced the spark plugs and it worked a little, but it continues to do it.
The problem: When I get on it at WOT under full boost, around 2500 rpms, the car loses all torque, misfires spits and sputters throughout the rpm range until about 5300 rpms then it all of a sudden has torque and pulls great.
I don't have any boost leaks that I know of along with vaccum leaks. There is no flashing cel or misfire code for my coil packs. Can this be a faulty n75 valve? if so what could fix it?
Golf/GTI VII :: Loss Of Power Especially After 2nd Gear
About 3 weeks ago I purchased my MK7 GTI SE w/ DSG. About a week ago, I started noticing a very slight rasp around 3.5k and up under heavy WOT. Note the sound was very subtle in the cabin and unsure what it sounded like outside. This past weekend, I started noticing a loss in power, especially after 2nd gear. A strange sound under throttle--almost sounds like a supercharger winding down (hollow with a slight whine)--when giving a good bit of gas around 2.5k and up occurs. At first I though it was road noise from my neighborhoods new roads since the sound only occurs on new roads, but realized that noise never occurred the first few weeks I had the car. No CEL.
I took it to the dealership on a rainy day, so they couldn't see the loss of power with the car breaking loose, but they didn't find anything. I'm bringing it back this Friday to see what they can find. I talked with one of the service guys today and they think it may be a drivetrain problem. Supposedly no loose hoses and is holding boost normally. Any leads to what it may be??
Golf IV R32 :: Fluid Boiling And Loss Of Power In Hard Cornering
Have some issues with my power steering pump. When I purchased the car i discovered it had brown fluid in it. Replaced it with green type and tough the pump had taken no damages from it. Did a track day with slicks (Toyo R888) and got problems with fluid boiling and loss off power in hard cornering.
My first thought was that the pump was damages by the wrong fluid. Before I got around replacing it the pump started making more and more whining sounds while driving on normal road with road tires.
Therefor I replaced the pump but the sound still continues. I changes the belt tensioner as well since the bearing could cause some issues like this as well. But the pump still struggle on normal road usage.
Could the steering rack be damaged with some internal leakage from the wrong fluid on it when purchased? I run DLI engine mounts, I can't see how but would that affect the sound from the pump?
Could there be any bearing on the belt (water pump/ac/alternator?) causing this issue? When running idle the belt runs fine with out any typical shot bearing sound.
Ford Escape / Hybrid :: 2001 XLS - Momentary Loss Of Steering
A couple weeks ago I had to have both lower ball joints replaced on my '01 XLS 4WD with the 6 cylinder engine. The garage's alignment machine was on the blink, so the mechanic told me to it woudl be fine to drive, and to bring it back this week when the machine was fixed.
The Escape seemed to drive fine until today, coming home from work, the Escape veered slightly to the right, and there was a brief sensation in the steering wheel as if it had been disconnected, as if something slipped. Then the steering was back, and although I was tracking straight down the highway, I noticed the steering wheel was turned to the left. It seemed to steer fine, although I had slowed way down.
Ford 6.0L Power Stroke Diesel :: Torque Shift Trans / 4 - 5 Gear Shift Under Hard Acceleration
I have been having an issue with my 4-5 gear shift under hard acceleration and know that a rebuild is due soon but I was wondering if any high performance kit available with all the clutches and friction discs needed to rebuild.
View 6 RepliesSonata I45 (YF - 2011+) :: Acceleration Loss When Going Into 2nd Gear From Stop
I noticed twice yesterday when I was accelerating from an intersection, going into 2nd gear (or 3rd depending on how short 1st is) it feels like it slips into neutral and I lose acceleration. If I take my foot off the gas and coast for a moment then re-apply acceleration, it goes on as normal without any problems.
66k miles... Owned it for 2 years and have had no other issues and have only taken it in for oil changes.
Am I correct in assuming the ATF is supposed to be good for the life of the vehicle?
Passat (B5) :: Hard To Get Car Into Second Gear Under Normal Acceleration From A Stop
my wife has a 03 wagon 1.8t with a manual, lately she and i have been having problems getting car into second under normal acceleration from a stop.
Clutch is good no slippage problems.