Sonata I45 (YF - 2011+) :: Uneven Acceleration / Idle Rough
My 2011 Sonata 2.4L GDI has already 76k miles. Spark plugs were replaced around 75K miles, Air filter was replaced. Fuel treatment was done several time since ownership, Intake CRC for GDI was used once about 2K miles ago. The car is doing good until recently. When I accelerate the car acceleration goes uneven. It is not like hesitating but you feel like the car is taking it in steps. Sometimes the first run in the morning, the car idle feels a little bit rough but that's only in the morning. It has been like that for a month now. What do you think it can be? No Check engine light, no pending codes and nothing major except that. I really suspect a bad upstream oxygen sensor (Air fuel ratio sensor). What do you think?
A look through the intake shows a very clean intake. No signs for any carbon deposit. A Hyundai dealer checked the car and told me there is nothing to worry about. Just told me to buy more Hyundai fuel treatment (AKA Chevron Techron) which was done and still I feel uneven acceleration.
Golf IV R32 :: Uneven Idle / Slight Surges Under Acceleration
OEM plus. 93k. Um tune. Evoms intake.
Did the plugs and coil packs, fuel filter, cleaned throttle body (Did a vagcom alignment) as well as some other insignificant maintance.
Car ran fine for weeks after, but recently it has started to bounce around randomly at idle. Like 650rpm(normal) for a few seconds. Then it will Slowly climb to 800rpms, hold there for a few seconds. Then back down to 650ish for a few seconds, then back up to 800 for a few seconds. And so on. It's very subtle and very random. Then sometimes when accelerating, I can feel it in the gas peddle. Like a slight pulsing power loss. Very slight and of a similar rhythm to the idle issue.
I do have a check engine light for Load Calculation cross check-p1143-001 upper limit exceeded. But that has been a battle I have been fighting for a year or so, and I think that is some kind of vacuum leak, but this rpm issue just started a few weeks ago. The only thing I was thinking so far is that when I was doing the plugs and coil packs, I noticed that there was a slight bit of what looked like dielectric grease on each coil pack already from the factory. So I didn't put any more in the coil packs sleeve part that fits over the plug. So was that a mistake? And if it was a mistake would this be a symptom of that?
Accord :: 88 LXi - Uneven Acceleration When RPM Is In Range Of About 2200 - 2800
The car accelerates unevenly when the rpm is in the range of about 2200 - 2800 rpm. Above that engine speed, it quickly smooths out. I replaced the distributor in it in Jan. 2010 and I'm wondering whether the distributor and/or vacuum advance is the cause of this behavior. I don't know whether the distributor also has a centrifugal advance. If it does, then I guess that could another possible cause.
Could I test the vacuum advance by disconnecting the 2 vacuum lines from the vacuum advance control? How to troubleshoot this behavior?
The distributor was bundled with the vacuum advance control, so I presume I'd be replacing the whole assembly if I can verify that the distributor or vacuum advance control is the problem.
Alero :: 2002 V6 Engine Idles Roughly When Parked / Hesitation On Acceleration
Lately I have been having some trouble with 2002 Oldsmobile Alero v6. When the car is sitting in park I have noticed that the engine idles roughly, And when I try to drive it, the car hesitates on the acceleration every now and then. Also the emissions light (the orange one) will come on for awhile and then dissapear. At first I though it was dirty fuel injectors so I added some Fuel injector cleaner, but that has not fixed the problem. I was thinking the park plugs may need replacing?
View 1 RepliesFord 6.0L Power Stroke Diesel :: Squeal Under Hard Acceleration At 3000 RPM With Roughly 20 Lbs Of Boost
Experiencing a squeal under hard acceleration at 3000 rpm with roughly 20lbs of boost, not present before and not present after 3000 rpm. light acceleration to 3000 rpm does not create sound, as well as turning 20lbs at a lower rpm (higher gear with throttle input). Truck has an EGR delete, EGR delete up pipe. EGR valve is still in place and plugged in. Truck did come with a banks six gun, so does not have EGR delete tune, however no trouble codes are present. What to check?
View 9 RepliesMazda - Protege :: 2000 - Idle Roughly - CEL Comes On?
I have a 2000 Mazda Protege ES (1.8L) with 120k+ miles and an automatic transmission. The car drives well at speed, but when sitting at stops it will shake a little, sometimes worse than others. Often the RPMs drop to below the lowest tick for a split second before recovering, very much like when driving a manual transmission and not pressing the clutch in enough. Even when the RPMs are steady at a stop, it shakes enough to rattle a couple of the plastic parts in the dashboard.
Recent history (some likely unrelated, but I'm no expert):New air hose (one from the air filter to the engine) in September. RPMs were falling at idle more often than they are now, there was a decent sized crack in the hose. RPMs stopped falling as often, but has idled roughly before and after.New radiator and thermostat in April (overheated on the interstate and cracked open).New spark plugs and wires last fall after one cylinder wasn't firing.For the last couple years every fall when it starts to get cold, the alternator belt squeaks and I tighten the bolt a little each morning until it stops (usually after 2 days, maybe 3 - the alternator itself is on a long bolt that adjusts the belt tension).Every 5k miles I have the oil changed with high mileage oil and tires rotated/balanced.
I took it to a garage a couple weekends ago after the check engine light had come on earlier in the week. I reset the computer and the light never came back on, so I lost the chance to have the code read, but there weren't any other symptoms beyond what I'm used to. The mechanics at the shop said they couldn't find anything specific causing the rough idle and suggested replacing some or all of the motor mounts, which are weak. They didn't seem confident that would fix the problem, and neither am I, as I don't see how weak motor mounts would explain the low RPMs as well as the shaking.
Passat (B5) :: Lumpy Idle / Smooth Acceleration And Misfires - CPS Error
I am trying to track down a problem for a friend with a 2001 Passat, 1.8L. The car has 150k and had a timing belt about 50k ago. About 3 weeks ago, it started misfiring badly on idle. In gear driving around, it purrs like a kitten. I scanned for codes and got:
Address 01: Engine
Controller: 4B0 906 018 CL
Component: 1.8L R4/5VT G 0001
Coding: 16551
9 Faults Found:
[Code] ....
At first I thought it might be a vacuum leak, but it looks like when he took it in 2 weeks ago they replaced all the vacuum hoses. It is unclear when he last had sparks and coils. I understand the likely culprits are:
sparks
coils
ICM
I am hesitant to blame sparks/coils if he is getting misfires on all 4 cyl. It seems like they might have screwed up the timing belt install given the camshaft sensor error, but he's been running for 50k miles since the change, and this idle issue just appeared recently.
Malibu :: 2003 - High Idle At Roughly 2500 RPM
I have a 2003 Malibu with 57000 on it. It recently started to high idle at roughly 2500 RPM. Could the throttle position sensor have gone bad? It will do this after it warms up.
View 3 RepliesS-10 :: 1995 Blazer Cranks / Idle Very Roughly And Usually Die Shortly
I have been given a 95 S10 Blazer 2dr because the owner could not afford to have it put into the shop. Literally, GIVEN. Anyways, to start off the battery was as dead as it could be so I gave it a good 2 day charge and started troubleshooting. Here are some symptoms:
Problem cranking (acts like its not getting proper fuel, or maybe too much? However, I don't smell fuel like its flooding out)
IF, it cranks, it will idle very roughly and usually die shortly after
IF it doesn't die shortly after cranking, any attempt at using the gas pedal causes a rough/irregular throttle response usually followed by it dying.
The VERY first time I cranked it after charging the battery, it cranked perfectly and drove/idled as smooth as ice. I let it idle for about 30 minutes making sure it wouldn't overheat or anything else. Everything did fine, I killed it and cranked it again later THEN encountering the problems described above. It's been the same since.
So, some of my guesses (keeping in mind I'm not very familiar with these vehicles) some type of sensor (crank/idle), bad vacuum leak or a loose connection somewhere in the electronics. Looking for some type of confirmation before I waste money throwing parts at it.
Also, included a short video of what it's like trying to crank and running. [URL] ....
Ford F-150 - 1997-2003 :: Idle Roughly - Shakes?
Truck seems to have a rough idle not bad I had kid in back seat and ran into store came out and he asked why my truck was shaking. Plugs been changed dunno anything else I could do.
View 8 RepliesGolf IV / Jetta IV :: When Startup It Often Dies Soon After And Idle Really Roughly Until Warm Up
I have a 1999.5 jetta vr6, the CEL is on (p0102 MAF sensor circuit low or something like that...). When i start it up, it often dies really soon after and until its warm it will idle really roughly. I'll have to start it up between 5 and 15 times... Once its warm and about 190 F oil temp it runs just fine, but still has a slightly rough idle.
I have a new MAF sensor coming in, or if there are any other things i should check that might contribute to the problem.
Lincoln - Towncar :: 1996 - Idle Roughly After Sitting For 10 Months
Bought a car that has been sitting for 10 Months. Starts up really easy, idles ruff. Should I drive it to clear it out? or ? 1996 Lincoln Towncar left in great shape just over 100,000 miles.
View 5 RepliesDodge - Ram - 1500 :: 1997 - Idle Roughly At Warm / Accelerating
I have a 1997 dodge ram 1500 4x4 with the 318ci engine. 140,000 miles. Fall 2009 I replaced the CAT (old one had broken loose and was rattling around inside) and both o2 sensors. A few months later, when I'd start the truck cold it would idle fine then as it warmed at idle it would run rough almost quit then idle up and run fine all by itself. When started warm it would idle fine then hesitate while acclerating a few times then run fine. No check engine light. Now, about 10 months later check engine light is on (P0138 o2 circuit high voltage bank 1 sensor 2). I have put about 5,000 miles on the new CAT. I checked the wires and connections for damage and found none. Also, new cap,rotor,plugs and wires.
View 3 RepliesHyundai - Accent :: 2002 - Idle Roughly After Clutch Replacement
The problem started when my clutch fluid began leaking a couple of months ago. I first noticed that it would take an unusual amount of effort to shift into gear and, after checking, found the clutch fluid completely gone and I filled it up immediately. Three weeks later, the fluid was gone again, so I took it in to a reputable mechanic, who said I needed my slave cylinder replaced. A week after replacement, I start to notice that my car increasingly had trouble "catching" into gear (my engine was accelerating, but not moving very fast; soft clutch). I thought maybe something went wrong with the slave cylinder repair and took it back to the same place, but the news came back that I needed a new clutch.
At 143,000 miles on the original clutch, I wasn't surprised it was time for a new one. Immediately after picking up my car with the new clutch--and by immediate, I mean right after I pulled out of the mechanic's parking lot--I noticed my car was driving horribly. The engine was idling extremely rough and it felt gritty when pressing the gas pedal during acceleration. I took it back to my mechanic the next morning to explain the problem, but they treated me like I was an idiot, didn't detect anything wrong with my car, and clearly didn't know what I was talking about even though I personally showed them my steering was shaking pretty badly while idling.
A few more days of the rough idle/gritty acceleration and I went back, but they just suggested getting my fuel injection system cleaned. I personally checked to make sure that the wires in my car were connected properly, as well as making sure the hose connecting to the air filter was on there correctly. Today on a whim, I took my car to Autozone to have them check the computer, even though I don't have a check engine light on, and sure enough the only code read was P0302--Cylinder 2 misfire.
My question is, what is the most likely cause of the cylinder 2 misfire (given my car's very recent history) and most importantly, could the mechanic have caused the problem I am experiencing? How should I handle this situation with them from here? I will no longer be using their services after I get this problem sorted out, as I feel like my car did not receive the best service.
Ford Super Duty (1999-2016) :: Idle Roughly At 60 To 75 MPH?
Truck runs and rids smooth up to about 60 MPH between 60 and 75 it gets bouncy really bouncy. Feels like the right front is whats bouncing. The not as bad on a good smooth highway but still bouncy.
I've replaced the Ujoints, Center Support Bearing on the rear drive shaft and had hit balanced. I had the front drive shaft completely rebuilt and balanced. I have new tires.
Shop said suspension needed done. Could that be the cause of the bounce or is it a CVJ on the front (feels like the front bouncing)
Side note, when the hubs are locked in there's a knocking when i turn hard right.
Ford - Explorer :: 2005 - Idle Roughly - Hard Start?
I have a 2005 Ford Explorer 4wd with 4.0 SOHC 6 cyl Flex Fuel. For months the vehicle has idle rough and increasingly becoming difficult to start. I decicded to replace the spark plugs and wires hoping to solve this issue! gap set to 052. When I started the vehicle it went into engine fail safe mode and wrench light came on. I then replaced the TPS on the throttle body and had no diference (I may have installed incorrectly! when I put it on the armature felt like it broke free inside the sensor). DTC codes read P0223, P2106, P2110 and with P0122 pending, P0223 pdg, P2106 pdg, & 2110 pdg.
With the old tps installed and wiring harness disconnected the truck will start in fail safe mode, but will not start at all with wire harness connected. A volt meter reads at computer end of wire plug 3.69 volts at pin one (gray/red wire +) and pin three (gray/white wire -) with key to on but not running.
Lexus RC F 2015+ :: Idle Seems To Always Be Uneven / Fluctuating A Couple Hundred RPMs
I've been noticing that my 15 RCF idles a bit weird. Regardless if AC is on or not, the idle seems to always be fluctuating a couple hundred rpms - almost barely noticeable. Usually 500-700rpm back and forth. Doesn't really bother me but I wonder if it's just my car or if all the RCF has the same issue and if it was a sign of a bigger issue.
Doesn't matter which mode I'm in either. Of course it's only noticeable when there is the actual needle stick on the RPM gauge (eco mode and the gauge with the yellow doesn't show well).
Honda - Accord :: 1999 - Rough / Uneven Idle - Stalled In The Past
My v4 99'accord 4cyl with 152K miles had stalled a few months back.*the idle was rough/uneven.. *in stop-and-go traffic sometimes when i would hit the gas pedal, engine would almost skip a beat or two, and sometimes stall..
The car shop changed the ignition switch..they cleaned out the EGR valve which had plenty of carbon build up.after cleaning out the EGR valve the idle was much better.. But over time the idle has gotten worse. i fear another stall is around the corner. Is the EGR valve bad?
Another thing i noticed while test driving in the parking lot, i stop and start again by applying low but uniform pressure on the gas,the engine picks up, then drops, and then picks up and drops a few times before the car finally picks up speed..
Accent LC (2000-05) :: 2001 Engine Cuts Out Intermittently - Idle Roughly
Been having a fair bit of trouble with my accent, at first my car sometimes would hesitate on acceleration in 1st gear. Now it has a rough idle and the engine just completely cuts out at random. It does however start straight back up. It makes an odd noise whilst idling almost like a misfire from the exhaust. On start up it blows a lot of white smoke. And when you do get driving it is really jerky. It's been serviced every 5000ks. I've changed spark plugs, map sensor and throttle body sensor, put a fuel injector cleaner through and still no improvements. It's been booked into the mechanics for next Tuesday.
View 1 Replies