Questions about troubleshooting and solving rough idle problems

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5
votes
4answers
1k 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 ...
7
votes
3answers
17k 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 ...
5
votes
2answers
160 views

Why is my Chevy 2008 Cobalt not acting as though it's getting enough fuel and reading “cylinder 4 misfire?”

I have a Chevrolet 2008 Cobalt (LS) that I've had for about 7 years. No sooner do I have this thing payed off, when it starts giving me the following problem (I've never had any trouble with it ...
4
votes
5answers
2k views

2004 Mercury Sable -Trouble with starting and stalling

I've had my car in and out of the shop for several weeks and I'm really becoming very frustrated. I don't really know ANYTHING about cars, but about a month ago the car would sporadically have ...
3
votes
0answers
23 views

1998 Mazda 626 LX

I have a 98 Mazda 626 LX. About a month ago it suddenly was shaking really bad took it to Midas for the check engine they told me it needed a fuel flush, trotted body cleaning, and fuel system flush ...
3
votes
1answer
129 views

Slight vibration while idling

I just did a change oil and then change spark plugs (from normal copper to platinum if that matters) and high tension wires for my Protégé 2000 Mazda Automatic Transmission. Prior change my idling ...
5
votes
1answer
108 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 ...
9
votes
1answer
188 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 ...
5
votes
0answers
23 views

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

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 ...
8
votes
2answers
139 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 ...
6
votes
3answers
261 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 ...
6
votes
2answers
208 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 ...
3
votes
2answers
104 views

2006 Pontiac g6 rough idle and intermittent spongy brake and starting issue

I have a 2006 Pontiac G6 with 160k on the 3.5 motor. Around 155k the brake pedal went hard and spongy. Also, about 1 in every 40-50 times I start it cold, the starter will turn without a successful ...
4
votes
2answers
116 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 ...
1
vote
1answer
281 views

Mk1 VW Golf/Rabbit - Engine idle fluctuates at random times

I have a Mk1 VW Golf/Rabbit with K-Jet mechanical injection. Occasionally when I pull up at stop lights the engine idle will rhythmically dip and climb (between 600 and 1200 rpm). This probably ...
7
votes
2answers
105 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 ...
6
votes
1answer
61 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 ...
2
votes
2answers
37 views

Jeep stalls a lot has trouble idling after battery pulled for a long time?

I've had this a problem a lot with this vehicle. I have a 99 Jeep Wrangler TJ. I believe the car's computer has a battery that is a dead (like a watch battery). For some reason when it stalls or when ...
8
votes
2answers
219 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 ...
2
votes
2answers
254 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 ...
3
votes
1answer
55 views

Rough idle when AC is on

My Toyota Vitz 2007 idles roughly when AC is on. If AC is turned off, the idle becomes much smoother. This vibration is more visible if I suddenly stop in traffic. As soon as I stop, several rough ...
0
votes
2answers
538 views

What will cause my Ford Expedition not to start?

I have a 1999 Ford Expedition. I was having trouble with it idling and now it won't start. What can cause this problem? Yesterday I was driving and had to double foot it to keep it idling. Every ...
0
votes
2answers
49 views

2006 Scion Tc Base - lots of vibration and bad smell from exhaust

2006 Scion Tc base automatic transmission, has 149k miles on it.The car used to vibrate a little at idle. It suddenly started vibrating a lot. It is shaking as if there's an earthquake! Idle rpm at ...
4
votes
1answer
1k 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. For roughly a month now, ...
1
vote
1answer
58 views

How Does a Stuck Purge Solenoid Cause Problems

In the WSM for my car, it lists "purge solenoid valve malfunction" as a cause of both a low idle with excessive shaking and loss of power during acceleration. I'm wondering the exact mechanism / why ...
4
votes
11answers
39k 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 ...
2
votes
0answers
95 views

E46 rough idle with coolant light on

The car is 2001 BMW 330i. I have changed ignition coil, spark and IAC. Last week, my car experienced rough idle. Then I changed the coolant temp sensor today. After adding coolant and bleeding, the ...
4
votes
2answers
612 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 ...
1
vote
3answers
240 views

1998 Honda Accord V6 - Rough Idle/Stalling

My daughters accord idles really rough after driving it for about 10 minutes, but not as you are driving it, only when you stop. Then, when she stops, the car usually shuts off. It normally starts ...
3
votes
1answer
8k views

Hard shuttering and engine dies when A/C is on at idle

When the car is idling and the A/C is turned the engine will shutter hard and/or turn off. I've already replaced the IAC valve; it was working for a little, but now it's back to shutting off. The ...
1
vote
1answer
26 views

Low idle and tacho twitching after electrical cut out

The car is a 93 VW Cabriolet (Mk1 Golf/Rabbit). I was parked with the engine on lowering the hydro/electric roof when the engine and power cut out. I couldn't restart the car so checked the battery ...
6
votes
2answers
23k 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 ...
5
votes
3answers
10k 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, ...
4
votes
3answers
5k 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 ...
5
votes
1answer
657 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 ...
2
votes
2answers
762 views

is there any way to adjust my idle speed - 2003 Cadillac CTS

My 2003 CTS vibrates pretty bad at idle speed (around 600 RPMs) But If I rev up to 800 or so, it's totally smooth. The real problem is partially due to worn motor mounts, but I dont want to spend ...
4
votes
0answers
53 views

2008 2AZ-FE rougher, throatier idle; and growl on heavy accel out of sharp turn

I have a MT Scion TC. Key detail on the heavy acceleration out of sharp turn is this usually only happens when I've been engine braking into the turn, and not every time. I'm not certain on the ...
1
vote
1answer
254 views

cause of Rough / fluctuating RPMs in low RPMs

It's not dying (hasn't yet) but when the car is idling or in low RPMs the car (Mazda Protege 5 2002) is fluctuating in RPMs. Also, the last start was rough. I've had issues with air intake before ...
7
votes
1answer
508 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 ...
0
votes
2answers
3k views

Why does RPM jump between 1000 and 2000 at standstill (2002 Mercedes-Benz CLK 200 K)?

My car has a kind of a rough idle and it's like it gives a bit of gas, meter goes between 1000 and 2000 rpm at standstill. Same if I shift up to 1 or 2nd gear. If I then take it for a drive, car jerks ...
1
vote
1answer
82 views

BMW e46 problems after Lysol in air intake

I was spraying Lysol into the cabin air intake (not the engine intake) right under windshield wipers while running the fans, and after doing this for several minutes (fans on the whole time, Lysol ...
1
vote
1answer
108 views

Irregular Fuel Pressure and a Old Clogged Fuel Filter

I was reading this article on vapor lock regarding my intermittent hot weather idle problems, and was wondering if an old, clogged fuel filter could cause intermittent fuel pressure problems and put ...
3
votes
0answers
114 views

Performing a Cylinder Power Balance Test

In the course of trying to diagnose a hot weather rough idle / stalling problem ( which doesn't occur in winter weather ) on my 97 Mazda 323 I performed a cylinder power balance test eye balling the ...
2
votes
1answer
279 views

Rough idle in neutral

I have a 6-speed 2012 135i, and whenever I idle in neutral, the car vibrates and makes a noise that I can only describe as sort of a faint grinding sound (it doesn't actually sound as bad as that ...
3
votes
1answer
186 views

Engine Turns Over Gets to 500rpm, Shakes, Then Loses Power After Spark Plug & Wire Change

I drive a 1994 TOYT Camry LE 2.2L Coupe. A couple days ago while I was driving, I stopped at a stop light and my engine block started shaking the whole care at low speeds and idle. I replaced the ...
3
votes
2answers
428 views

BMW e36 wont maintain idle

A friend has an e36 that wont maintain idle. The car is driveable but coughs and stops when idling. I've checked the air box and boot and they are in good condition - no leaks. I think spark and ...
4
votes
9answers
18k 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 ...
3
votes
1answer
404 views

Engine sputtering, not accelerating. Left for 20 mins and is now fine?

The car is a Mk1 Golf (1993, 1.8lt, mechanical injection). I was driving up a medium incline and suddenly my car starting sputtering and I lost acceleration. I pulled over and started the engine ...
1
vote
0answers
80 views

98 olds bravada sputters when it warms up [closed]

My 98 bravada is fine in the morning when I first start to drive it but after about 20 min or so it starts to sputter and also sputters while it's idling. Does this sound like it could be a plugged ...
1
vote
0answers
120 views

Missing/rough idle at fist start or when parked for over 4 hours [closed]

I have a 99 Honda Accord. It has a miss/rough idle when its parked for more than 4hrs maybe, but specially in the mornings. It's only at the first start, after that it runs normal. I have changed ...