Questions tagged [rough-idle]

Questions about troubleshooting and solving rough idle problems

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13
votes
2answers
9k views

Rough idle @ stoplights - O2 sensors reading zero voltage

I have an '05 4.7L Dodge Dakota that has had an issue with rough idle for over a year now. It seems to only happen after coming to a stop at a traffic light. It seems to happen more often after having ...
11
votes
2answers
16k views

My Ignition Timing is Retarded, no seriously, it's really screwed up

I logged some test data to try and help me figure out why my 98 Mazda 626 GF 2L ATX has a rough idle and is suffering from hesitation. (Speed k/h),(TPS_v),(MAF g/sec),(RPM),(SparkAdvance),(EngineLoad)...
11
votes
2answers
2k views

2001 Infiniti QX4 rough idle - leaking fuel damper vacuum port

I have a bit of an involved problem, so I’ll break it down a bit and try to provide as much detail as possible. My main problem: I have a rough idle on my 2001 Infiniti QX4. It’s not extremely rough,...
9
votes
5answers
43k views

Car dying at low RPM only after filling up with gas

My question is closely related to one about a Jag dying at low RPM, but is slightly different because it only occurs after refueling and because the problem persists after cleaning the throttle body, ...
9
votes
4answers
41k views

2009 Toyota Camry 2AZFE idle vibration remains after new motor mounts

My wife's Camry went in to the shop 2 months ago for a rough idle. We bought the car used in February with 72K miles. We've put on 10K and decided to have a mechanic look it over and tell us what it ...
9
votes
2answers
628 views

Solstice! Car starts to run rough after hitting the gas, intermittently.

So, after putting the A/C-delete belt on to take my POS A/C compressor out of play, everything works great: No frightening rattle / clanging from the engine bay Idles smooth Sounds like a brand new ...
9
votes
1answer
3k views

Idling issues on 1995 Kawasaki ZZR600

The bike was running rough and could not get a constant idle speed. I checked the air filter and it was pretty well shot (contamination, etc.). As I awaited delivery of the new air filter, as a test I ...
8
votes
5answers
91k views

How to trigger an idle throttle position re-learn?

My Toyota Vitz 2007 idles roughly and I got advice to clean the throttle body and make the vehicle re-learn the idle by starting the engine and let it idle for some time. My question is, is it ...
8
votes
3answers
2k views

My BMW 325xi smells like gas

It is difficult to start my BMW it runs rough and smells like raw gas from the exhaust pipe. My check engine light is on. What could be the problem? I just had the engine replaced I am over 8,000 ...
8
votes
2answers
9k views

Is it healthy to drive with a bad IAC? [closed]

My IAC is bad and in order to keep my car running while a stop sign/light is to have one foot on the brake and one foot on the gas. Is this an effective fix to travel until I get it fixed? Or ...
8
votes
3answers
90k views

Rough Low Idle and Engine Shakes, Hesitation and Lack of Power

On a 98 Mazda 626 GF 2L I'm working on the engine seems to shake / wobble for about a second / second and a half when going to WOT from any starting rpm. It also almost sounded like maybe one of the ...
8
votes
3answers
11k views

Astra MK6 - when warm, rough idle and shudders while accelerating

Here's a video: https://youtu.be/wYyaW9wRt6U For a couple of months now my car has had a rough idle and shudders while accelerating - Vauxhall Astra J Exclusiv MK6, 4 years old 61k miles spark plugs ...
8
votes
1answer
4k views

Engine hesitates and stalls when warm

My car is a Toyota Vitz 2007 and it has 80k KM on it. I usually drive short trips (about 5km) most of the time in a low traffic road. Car drives mostly fine in these short trips. But, if I drive for ...
8
votes
1answer
1k views

Rough idle only under load

I'm going to describe the symptoms with a very short history, some preliminary theories ( based on past work I've done on this car ), the data I've gathered and what, if any, conclusions I might draw ...
7
votes
2answers
19k views

2005 Honda Accord 4cyl revving idle when warm

My 2005 Honda Accord I4 is idling fine when cold but once warm it begins "revving" on its own between 1200-2000RPM at about 0.5Hz. The vehicle initially threw a DTC P0507 ("Idle Air Control System RPM ...
7
votes
2answers
2k views

1996 Chevy K1500 Silverado ZZ4 5.7L - Rough Idle, Plug Damage, Overheating, EGR

I'm having some serious problems with my truck. It started out as rough idling and then it got worse. I have replaced all 4 O2 sensors, temperature sensor, knock sensor, distributor wires, ...
7
votes
2answers
4k views

Startup problems: low idle RPM and stall on pressing the accelerator

My sister has a nice first generation Nissan Micra 4-speed automatic (I think it's the naturally aspirated, non-electronic carburetor version) . However, when starting it from a cold start (not ...
7
votes
3answers
79k views

RPM fluctuation while idling

I have a 2003 Ford Explorer that hasn't been idling well lately. It normally idles around 800 or 900 rpms, but lately it will slow down to 400 or 500, then burst up to 1100 and repeat the process ...
7
votes
1answer
773 views

2015 Honda Mobilio - Car shakes when started

I have a 2015 Honda Mobilio with a manual transmission. I have had this car for 6 months and have not experienced any problems until yesterday morning. When I start my car, the engine shakes badly. ...
7
votes
2answers
3k views

Rough idle problems on 93 Miata

The engine idles fine when cold then drops to about 800 and I have no problems at all except maybe inconsistent idle (goes up and down but not by much) although when I turn off the engine and then ...
7
votes
2answers
849 views

02 Mustang GT 4.6

I was on my way to work and car started to run rough stumble and check engine light started to flash. Immediately turned around limped home about 3 miles. Changed plugs and swapped some old coils ...
7
votes
1answer
3k views

Engine run-on (dieseling) condition suddenly getting much worse

1995 Chevy S-10 Blazer - 4.3 L Vortec V6 (vin W with PCM) - 230,000 miles original owner. OBD-I (or 1.5) GM transitional year with OBD-II style connector. I've been working on my vehicle a lot ...
7
votes
1answer
48k views

Why does my engine vibrate at idle only when I have the AC on?

2001 Honda Civic EX First noticed this problem when I got the car about a year ago. When the car is idling without the AC on, all is good. When I turn the AC and the clutch engages, it begins to ...
6
votes
11answers
73k views

Honda Accord 2000 V6 intermitently stalls when idling after start. What may cause it?

I have 2000 Honda Accord V6 with 140K miles and which is very well maintained and runs really nicely. However, every once in a while when I start it it would do some erratic rpm changes on idle and ...
6
votes
2answers
12k views

Rough idle + slow acceleration + engine dying after spark plug change

I recently changed the spark plugs and wires on my 2002 Ford Focus SE with Zetec (DOHC) engine. I used NGK TR5IX (7397-4PK) Iridium IX plugs and Motorcraft wires. When I received the plugs, they were ...
6
votes
3answers
15k views

2000 Ford Focus, low idle, stalling at lights, white smoke from exhaust - P0171 Code - problem?

I have a couple of issues which I hope are all related. The car is a petrol Ford Focus 2000 1.8. Seems to be listed as LX, but the engine is Zetec. When stationary, the idle is quite jumpy, and the ...
6
votes
1answer
6k views

08 Silverado 5.3 rough idle and dark cold start exhaust

I recently bought a 2008 Silverado 5.3 with 77k on it. After a couple weeks I noticed that at idle the engine would stumble and my rpms would drop slightly. It eventually set off the check engine ...
6
votes
5answers
49k views

Car turns off due to low RPM, only when starting car

Background: I had my 2003 Infiniti g35 at the mechanic to fix an electrical problem (turns out remote starter wires were rubbing and causing a short) and to fix an oil leak. All in all they changed ...
6
votes
1answer
10k views

Citroen C4 - Poor idle and low rev performance?

I have a Citroen C4 1.4 with 1360cc 16V KFU / ET3J4 petrol engine with 120.000 km. This problem appeared 3 - 4 years ago at around 40.000 km. When the engine is cold / hot there is a flat spot ...
6
votes
1answer
1k views

Do I have a fuel pressure or injector problem Part 2

This is a continuation of my previous fuel pressure / injector question. So the missing part for my fuel pressure gauge came in and I was able to do a few more tests. The first thing I think is that ...
6
votes
1answer
88 views

2004 Tahoe Conking, Glub Glub Glub

My 2004 Tahoe is not running well and conked out on me the other day. I just had it repaired for some other reasons and the repair shop suggested we needed to have spark plugs replaced so it will run ...
5
votes
12answers
32k views

1999 Mazda 626 Shakes when Idle

I've got a 1999 Mazda 626 that shakes really badly when idling. It gets a little better when put into neutral, but not much. I've had two people suggest possibilities: Fuel filter Vacuum hose This ...
5
votes
5answers
18k views

RPM bouncing when in idle, especially when AC in switched on

I have a diesel common-rail 1.5l engined car. Lately I am facing an issue where the RPM needle is bouncing in the tachometer when the car is idling. The normal idling RPM is around 820. When idling, I ...
5
votes
4answers
2k views

Emissions Problem: Lambda AND CO Slightly High on my 98 Mazda 626

I just took my 98 Mazda 626 for it's inspection and they said the carbon monoxide is slightly high. The test is done using a tail pipe gas analyzer while holding the RPMs between 2500 - 2800 for ...
5
votes
3answers
705 views

2002 Jeep Grand Cheerokee Laredo hesitate/jerking + multiple CEL codes

I have a 2002 Jeep Grand Cheerokee Laredo 4.0. I don't know much about cars, and recently had bought this Jeep off of a private owner that had said it had no problems but now after owning it for 2 1/2 ...
5
votes
2answers
12k views

What is an acceptable amount of up/down play in a distributor shaft?

1995 Chevy S-10 Blazer - 4.3 L Vortec V6 (vin W with PCM) - This is the distributor style with vertical cap posts. 230,000 miles original owner. EDIT: Please click on link below to see a photo of ...
5
votes
1answer
4k views

Car engine vibrates vigorously with air conditioning on at idle speed

My Toyota e80 sedan 4 doors having problem when the idling speed was set at 900 rpm. The engine will vibrates when air conditioning turns on and the engine rpm drops to 700 rpm. I need to depress the ...
5
votes
1answer
6k views

Idle speed is wrong after replacing battery (2006 Camry)

I have a 2006 Toyota Camry. I replaced the battery the other day which I noticed was getting weak. The battery was disconnected all of 10 minutes. After, it idles too low. It shudders pretty bad and ...
5
votes
2answers
907 views

Does this harmonic balancer / crankshaft pulley look damaged?

Does this harmonic balancer / crankshaft pulley look damaged? To me it looks like the rubber between the inner and outer parts is at least cracked if not completely separated.
5
votes
2answers
8k views

Why is my car missing, surging, shaking and rpm's idling radically

1999 Toyota Camry 2.2 automatic Car is trying to die. RPM's are jumping from 1-5. Only way to accelerate is very slowly when it starts to buck. Have replaced fuel filter, air intake molded piece,...
5
votes
2answers
3k views

'98 Camry has occasional rough running / low speed idle problem

My '98 Camry (with the four-cylinder engine) usually starts, idles and drives like a dream. About a year ago I had the entire exhaust system replaced (including cat) due to corrosion. Since then it's ...
5
votes
2answers
14k views

2005 Honda Accord 4cyl low idle and stalling when warm

Yesterday my 2005 Honda Accord was running at a low idle when cold and stalling out when warm. Today I resolved the issue but I'm not sure what exactly I did that resolved it or what the original ...
5
votes
1answer
350 views

Revving Hyundai Elantra GT

I have a 2001 Hyundai Elantra GT. As of late when I start it up it idles rough for a few seconds, then revs up to 4000RPM and back down to 1000RPM. This continues until the ignition is switched off. ...
5
votes
1answer
51 views

Idle doesn't hold on 2006 Toyota pick up truck after giving a jump, actually failing to give a jump.

We have a 2006 toyota pick up truck and a 2000 mustang with a dead battery. Cable's have been Properly connected. 1, I can get no current flow, no jump from the toyota, yet it starts the pick up ...
5
votes
1answer
13k views

Automatic: revs dropping then stalling when stopped at lights

Kia Sedona 2012 automatic. Drove 180 miles on a full tank of fuel without any problems. Started the car the next day and it didn't start cleanly but did eventually. Was waiting on the drive with the ...
5
votes
2answers
2k views

ford focus 2002 low idle problem varying

I have a ford focus 2002. It has an idle problem. At a stop the idle will vary from normal down to about 500 RPM, almost stalling. It does this variation very cyclically, every 5 seconds or so. ...
5
votes
0answers
279 views

Ford F-150 4x2 4.9l straight 6 misses after lots of work [closed]

Just seems like plug wire, plug, or something missing shakes whole truck. It's acting like it's starving for gas. New plugs, plug wires, MAF sensor, idle control sensor, cleaned and still can't figure ...
5
votes
1answer
2k views

2001 Mercury Sable — Rough Idle/High RPM and Transmission Leaks

I have a 2001 Mercury Sable (24V DOHC V6) that has been having problems with its vacuum system. I live in Florida where the average temperature lately has been in the 80s. I've been experiencing a ...
4
votes
2answers
1k views

1998 Ford Ranger surges when idling

What should I be looking at to diagnose my Ford Ranger which surges when stopped? This typically only happens while the vehicle is warming up. After that, it's fine.
4
votes
2answers
2k views

Single Cylinder 4 stroke misfire at idling rpm

I have a Zongshen 200gy-2 bike, that has of late developed a misfire if there is no throttle, like waiting at traffic lights. It has recently been serviced, but the spark plug has not been replaced. ...