Ford - Escape :: 2001 - Engine Misfires Under High Load And Low RPM
I have an 2001 Ford Escape V6 3.0, about 130,000 miles. When the engine gets under high load and low RPM, before downshifting, it will shudder (misfire?). Local shop couldn't reproduce it, but they thought it might have to do with slightly cracked vaccume hose, which they gouged me to replace. No improvement. Next they wanted $700 to replace Valve Cover Gaskets. I decided to become a mechanic and learn how to do that one myself. Sure enough, there was a little oil dripping onto one plug. I replaced the gaskets and all 6 spark plugs successfully. Still didn't fix the problem though.
Symptoms will occur reliably when driving at 45-50 MPH with the transmission in overdrive (1500 RPM), and I begin a slight incline. The vehicle will kind of chug forward (feels like sporatic misfires) in overdrive, getting down to 1200 RPM before deciding to downshift. Generally, I can just give a little more gas to force downshift and avoid the nasty-feeling misfires. Some days, however, it is much worse, and will misfire at idle, and make me feel like I have to treat the gas as an on/off switch to keep the engine from dying. (It has never actually died.)
During a really bad day, I got a flashing check engine light. I did not check codes in time - they've all cleared.
I now have an ODB2 reader logging real-time data. All I can do is prove the conditions that cause the symptom: high engine load at low RPM is the recipe. Nothing seems to show a cause... I may just not know what I'm looking at :-/ . I haven't monitored long enough to record a 'bad' day.
I've read about ignition coil issues on this engine, and weather might explain why this is worse some times than others. However, I wouldn't expect that to be load dependant.
Most of the time it feels like the transmission just isn't shifting when it's supposed to, but on the bad days it seems more than transmission related. When stopped at a light in Drive, this can still occur.
Yukon :: 1999 - GMC Suburban K1500 5.7L Misfiring / Lopes At Idle / Stumbles Under Load
I had to choose the Yukon, as there is no Suburban?
Anyway, I have a very bad misfire in my truck. Lopes at idle stumbles under load. Through substitution, I have tested: module, coil, and crank sensor. I have replaced: plugs, wires, cap, rotor, air filter, fuel filter and upgraded from SCFI to MFI (can you say "expensive best guess"?).
Still getting P-0300, P-0302 and mostly P-0304, using a Snap-on Modis scanner.
Compression tested today: all cylinders between 160- & 170 psi. After this, leak-down seemed redundant.
Back pressure test: 0.5 psi at 2500 RPM, both banks.
Steady fuel at about 60 psi.
I am going to pull distributor (175K miles) and examine drive gear. Not too sloppy at rotor bearing. However, how do I set baseline timing when I re-install distributor? If the distributor is OK, what test or part should I look at next?
Chevrolet - Suburban :: 1996 - Dry Start Only When Engine Warm
My Burb starts right up when the engine compartment is cold. Can barely touch the key and the thing fires right up.
Once engine compartment is hot (operating temp), I shut off the motor, let it sit for a few minutes and I get about 3-5 seconds of dry start each time I start it. It fires right up, runs great after that dry start period.
The dry-start behaves as if it's starved for fuel for those 3-5 seconds.
It's a K1500 with a stock 5.7l (350 ci). 180,000 miles and the entire drivetrain runs like a top. Only mod I've made is a K&N cold air intake.
Here's what I've done/changed recently (i.e. within the past 5k miles):
Fuel pump, OEM installed by dealer.Fuel filter.Ignition control module, BWD.Ignition coil, BWD.Crankshaft position sensor, GM OEM.Engine coolant temp sensor, BWD.Oxygen sensors (all four), GM OEM.Catalytic converter, replaced one of the two.Plug wires, BWD.Plugs, Delco OEM.Distributor cap and rotor, BWD.Cleaned ground connection (bolts to frame) for fuel pump.Alternator, new not reman.PCV valve.Battery.
Full diagnostics by a very qualified shop two weeks ago, no bleedback from injector spider, fuel pressure solid and holds perfectly. After 90 minutes of troubleshooting, the mechanics finally gave up.
One last thing with potential that I can think of is that I started running ethanol-free gas around the same time this issue surfaced. Not at the exact time, but at a relatively similar time. Gas mileage has increased by 40% and power increased, hard to blame "bad gas."
Nissan - Altima :: 1999 - When Idling It Misfires On Cylinder 3
The car crank up normally, but when idling it misfires on #3 cylinder. When start to drive it will drive at 45 mph at full revolution but when I stop at a light the engine begins to vibrate and shakes the entire car. When moving off again, it continues to vibrate and hesitate and will not get up back in speed 25-30 mlp and now start to backfire in to the manifold. While stepping on the gas it also makes a popping sound. If I try to get the speed up any higher it will violently makes a popping sound and backfiring constantly into the manifold and struggles to go. The engine is also getting very hot although the engine gage said it normal and not overheating. If the car is sitting in a grassy area while idling it will completely burn dry the grass underneath.
View 12 RepliesTiguan :: 2.0 VW Engine - Breather Valve Stuck Causing Oil To Enter The Cylinder / Misfires
We have a 2009 2.0 Tiguan with approximately 60,000 miles. About 6 months ago, the check engine light came on so we took it in and found out the breather valve was stuck causing oil to enter the cylinder and causing misfires. Had this fixed an about a week later, the car acted up again. Took it in and removed & reinstalled the intake manifold. Both pricey fixes. The dealership said it was a problem with the 2.0 engine design. Now we have taken it in again to a local shop who is now informing us we will need to replace the intake manifold. He said the same thing about the engine design. Our concern is that this problem will need to be fixed on a fairly regular basis. We really love the vehicle but cannot afford the cost of this maintenance if it becomes routine and are considering trading it in for a Passat.
View 3 RepliesFord Super Duty (1999-2016) :: 2003 F250 4x4 - Misfires On Cylinder 1 / 3 / 6 And 7 - Knock P0325
2003 F-250 SD 4x4 w/5.4L engine and 4R100 trans (pic in sig) . Truck has 280K on it with about 40K on a partial rebuild on the top end.
Took the truck out offroading and got about 4" from the top of the 33" tire in water (not mud.. water) . Someone with 6' tractor tore through the puddle.....
Well the truck survived through it ... albeit dirty as all hell and developed some issues soon thereafter. Codes for misfires on cyl 1,3,6,7, general ignition coil, etc etc etc
Power washed the underbody , washed the mud off the engine bay (yeah... with water but given it was caked with mud and water to fill the plug wells... no additional harm) .
Replaced all 8 COP and 4 plugs ( easier ones to reach), oil change, oil filter, new paper cone filter. checked most all the harness connections and cleaned with alcohol also. Reset the PCM/ECU and drove the truck for about 100miles and finally just after putting a full tank of gas (92 Octane) I throw a P0325...
The engine runs very clean, no hesitation, smooth idle, smooth acceleration on both light and hard acceleration. Just the damn code. Is it the gas I just topped off? After 100+ miles with new COP and plugs it threw nothing until this and runs great. Dont hear any knock/ping/detonation by ear and feels silky smooth at idle.
I really dont want to have to tear the intake off to replace bank 1 knock...
Ford Super Duty (1999-2016) :: Spark Plug On Cylinder 4 Is Sitting Level With Hole - Misfires
2001 Ford F350 V10, 220K in crap condition
First of all on the left side 2 of the coils were so withered the rubber separated from the bolt and were loose. Without any tools I was able to remove 2 coils. Typically there is the hole and several inches inside hole is where the spark plug sits.
On cylinder 4 the spark plug is on a funny angle and is level with the hole or possibly poking up above the hole. Tried sticking the ignition coil over the spark plug but it wasn't correct. Leaving it alone until my cousin can take a look. Spark plug was tight but I didn't put a ratchet on it.
Wondering, is this the infamous spark plug blew threw the cylinder thing. Wish I would have taken a picture (I will next time I'm with truck).
Had codes for misfires on 4 cylinders but that was with 2 coils unplugged (way I got truck at auction)....I replaced 3 of them (1/2/6).Cleared codes...4th cylinder remained unplugged....And the only code I got after letting truck idle for 10 minutes was something about ignition coil D (which would line up with cylinder 4 I think).
Ford Super Duty (1999-2016) :: 2001 F250 - Slight Bucking Under Load
I have a 2001 Ford F-250 5.4L V8. 117,000 miles. The problem I have been relentlessly trying to diagnose is a slight bucking that occurs under load when the truck is in overdrive. When the truck bumps up to higher RPM's it is fine but when it is around 1500-1700 RPMs on the highway it does a small buck like I'm hitting a bump in the road. I know there are many threads on this but none of them have gotten me any closer to a resolution. It also seems to have a bit of power loss when accelerating. Things I have done so far.
-Spark plugs and COP replaced about 1000 miles ago
-New fuel filter
-Cleaned MAF sensor
-Cleaned throttle body
-New PCV
-Seafoam treatment in gas and through brake booster.
Golf IV R32 :: Lumpy Idle And Misfires Under Load
I've got a R32 with nearly 100K miles on it. Several days ago I was adjusting my shifter cables and am not sure if i accidentally leaned up against any sensors or their associated connectors that are in that vicinity. I took the car for a drive to feel how the shifter adjustment had turned out. I was building engine RPM from 2500-4000 RPM, I let off the acceleration pedal and felt a small and new kick as if something got loose, popped off, or backfired. Not sure what it was but my engine started to misfire in what seemed to be in several cylinders. It idles rough but the needle doesn't exceed 1000 RPM during idle. When driving calmly, there is sporadic misfire. If pushed hard to build RPM, it will misfire heavily.
I scanned the vehicle and got the following codes,
P0300
P0301
P0303
P0305
I've checked
- Every hose I can see and feel for Vacuum leaks
- Checked all my fuses
- Swapped coils from banks 1,3,5, with 2,4,6
- Disconnected, cleaned and reconnected camshaft hall sender sensors and tightened the bolts.
- Have erased the coded and the same codes are back.
Ford F-150 (2004-2008) :: 2005 - Strong Misfires Under Load
I have a 2005 F150 with 5.4 and have been having increasing random misfires. This is MUCH more pronounced when the engine is warm, and I can certainly count on it to happen when under load, either accelerating or whatever. If I am forced to remain stopped for any extended period of time, such as waiting in line at a drive through, then start to drive again, the problem seems to increase exponentially, and is most pronounced in the 1300 - 1900 RPM range. If I take the overdrive off in order to put the rev's above 2000, it eases the problem, but does not eliminate it. The issue is much LESS pronounced when first starting driving, it seems to be most prominent only after it warms up.
So far, the only codes I have ever seen is random misfires, and only once has the code gone solid in the ECM. Usually, if I back off load for a minute, it clears up on it's own and the flashing code light clears .... If I attempt to accelerate hard, even when cold, the misfires get really bad and I can always expect a hard code soon afterwards ...... needless to say, I have no real power at any time, and my fuel efficiency is beyond bad (best I can get is about 11 mpg) ....
Jeep - Cherokee :: 1993 - Engine Softly Stutters And Misfires While Driving And CEL Came On
My inline 6 engine softly stutters and misfires while driving and has the check engine light on whenever this happens. It's becoming more frequent now - 20% of the time I'm driving I'd say. The codes are 11, 12, 27, 34. I've looked up the meanings of the codes and I'm leaning towards its bad fuel injectors or a bad connector leading to the fuel rail. I have lots of bad wiring on my 93 Cherokee haha. I've fixed so far: a bad head light connector, and an exposed wire that connects to my distributor - it would swing and touch my engine block causing the engine to die.
But now I am struggling on how to fix my small stuttering engine problem. So the problem only occurs after I make a strong left hand turn such as a 90 degree or a uturn so that means a connection is being pulled to the right. It doesn't have an issue turning to the right though. I don't have sway bars on my 6" lift so there's a reasonable amount of body roll to pull on the wires etc. When I open the hood with the engine running smoothly I can touch and wiggle the front fuel injectors and sometimes I hear it softly misfire or sputter. What connectors lead up to the fuel rail?
Suburban :: 99 Engine Died And Wouldn't Start When Driving At 50mph
I am working on a99 2500 4x4. 7.4 Replaced 230,000 engine with 90,000 engine.I had to fix a bad oil leak from the oil pressure sensor. Replaced it and delivered it.
Ran great Gal was driving at 50mph. Engine died and wouldn't start. She fried starter trying. Replaced starter, has no codes. 59-60 lbs fuel pressure with key on then holds 50 lbs. 60 lbs while cranking. Has spark at plug. NO security light staying lit or flashing. flashes then goes out. Smell of unburnt fuel is strong. Also no oil pressure at gauge when cranking and her key fob doesn't work.
Golf IV R32 :: Misfires On Cylinder 5 And 6
How the cylinders are numbered as your facing the car from the front left to right (forgot the order) so I can replace coil packs on cyl 5&6 (238 misfires in 2min is not good).
View 4 RepliesPrius (2004-09) :: Misfires On Cylinder 1 And 3, Now 2 And 4
2005 Prius 195k miles, oil changes every 5k +/- 500 (usually minus), new plugs at about 187k, TSBs for coolant loop done, coolant valve for ICE replaced on my dime, replaced aux battery in 2010. Transaxle fluid changed at 100k and 190k due to noise, but that is another post.
I mostly do my own work because, in general, I find dealerships to charge too much (like one hour to change the aux battery) or not competent (like changing the traction battery under warranty but leaving the seat belt behind the panel or not resetting the maintenance light during 5k Toyota covered maintenance)
Chevrolet - Suburban :: 2007 - Misfire After Working On Engine / SES Light Flashing While Driving
I replaced the oil pressure switch on an '07 Suburban 5.3L because the oil pressure was showing low once the engine warmed up. That did nothing, then I found out about that little filter/screen under the sensor. I intended to remove and clean the filter then reinstall it. While I was pulling it out, I dropped it back behind the engine and couldn't find it. I checked online and found a few people in other forums that said to just remove the screen as a "fix", so I left it out and put the sensor back in, just to get the vehicle drivable. It started right up and ran fine for me, parked it, and a after sitting for a few hours it started popping while driving with the SES light flashing on the drive home.
Code P0300 was set, no cylinder specific misfire codes were present. I checked the misfire data and cylinder #6 showed tens of thousands of misfires, #5 showed several hundred, but I think it was just picking them up from #6 since #5 is right after #6 in the firing order. I disabled each injector with a scan tool, all changed the idle except #6, it did absolutely nothing. #6 fuel injector had good pulse to it, I connected a fuel pressure gauge and put power/ground to injectors #6 and #4, both dropped the same fuel pressure. I did the "cylinder deactivation" test on the scan tool for the four cylinders that have it, they all did the exact same thing - the engine bogged way down for a couple seconds and then died. Is that normal? I can't say I've ever seen a V8 engine die before when running on 6 or 7 cylinders. I checked compression on cylinder #6, it showed very low, almost zero, but I tried it a few times and it would show just a little compression at times... valves staying shut? I'm thinking when I opened the pressure relief valve on the gauge and the piston was near the bottom of the cylinder may be when it showed some compression. I also switched the coil/wire/plug from #6 to other cylinders and the miss did not follow.
Could having that screen out cause this problem? Having the engine die when deactivating the cylinders makes me wonder if maybe it's commanding all four at the same time, although the test shows each cylinder being controlled separately. Using a MODIS, not a TechII. I just got done putting in a new filter/screen to see if it would make any difference, and of course it didn't.
Chevrolet - Suburban :: 2001 - Engine Severely Lacking In Torque For The First Minute Or So Of Driving
I have here a 2001 3/4 ton Suburban. It arrived last fall with 280K miles and a 6.0L V8 that was on its last leg (low to no oil pressure). I dropped in a 5.3L that I had handy, and had been happily driving it throughout the brutal Minnesota winter.
A couple months ago I noticed an issue developing. After a cold start, the engine would be severely lacking in torque for the first minute or so of driving. You could reach any RPM you wished, but the truck could barely accelerate. Once a minute or so had passed in this fashion, the issue would suddenly disappear... you'd be thrown back in your seat a bit if still attempting to accelerate, and the truck would take off. For the remainder of the trip, things would be fine.
Recently I went to drive the truck after it had sat for some weeks. It started fine, but the issue was now more persistent. When trying to accelerate, the gutlessness would continue for a good 15-20 seconds until finally and suddenly disappearing. Let off the gas, wait a moment, try to accelerate again, and it was the same thing all over again. Eventually I also noticed very obvious stumbling/missing when trying to get moving from a dead stop. Idle remained smooth.
The plugs and wires are only a few months old. The fuel filter is new. I checked for vacuum leaks (none that I could find). Fuel pressure is consistently around 50psi, even while the issue is happening.
The MIL was not on. I checked with my scantool, and found that P0101C was set, with P0101 pending. Visually examined the MAF harness and sensor; all looked fine. Swapped in a used working MAF; no change. (I suspect these codes may be due to the fact that I'm running a 5.3 with a stock, unmodified 6.0 PCM.)
My scantool is a Genisys running System 2.0. I'm by no means an expert with it, but I did know enough to try watching the miss counts while the symptom occurred. All cylinders seemed to be missing equally as much as the others, more or less.
Normally I'd be suspecting the fuel pump and/or associated wiring was going bad, but the pressure seems fine. What I might be missing?
Suburban :: 1999 - RPMs Shoot Up To 2000 Then Back Down To 1500 While Driving
So the other day I was driving to my storage locker about 30 miles away. All of a sudden my rpms would shoot up to 2000 rpms then back down to 1500 . Slowly they would go up higher every time. On my way back I was about 2 miles away and I lost 3rd and 4th a presume. I would be going 20-25 and it felt like it would be shifting up to third but would shift down to 2nd running 3500 rpms. I had to go 20 the rest of the time. Finally I got home and realized my dipstick tube wasn't in the tranny and must have lost oil. So I got it back in and added more. Thought it was the filter and oil so dropped the pan and replaced it. Still nothing.
View 2 RepliesHyundai - Elantra :: 2002 - Misfires On Cylinder 1
I have a 2002 Elantra that has been in shop 3xs for same thing. The car says it is missfiring on 1 and I have changed wires, coil pack and spark plugs with no success.
View 2 RepliesFord - F150 :: 2004 - Cylinder 5 And 6 Misfires?
I have a 2004 f-150 5.4 Trition v8 and recently i had misfires on 5 and 6 come up. After I changed out the coils and injectors on all the cylinders the misfire would still come up.
View 4 Replies