Question about Cars & Trucks

1 Answer

What could be making engine to have a rough idle?

Had it to dealership a couple of times,they tell me it's the character of the engine because no codes are showing and all cylinders are firing. Now it*s getting worst.

Posted by on

  • 1 more comment 
  • Harold Siegwart
    Harold Siegwart Nov 27, 2014

    Hi charles gindville, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?What is the make and year ,how many miles on the car what part of the USA do you live in ,many factors thanks just need more to go on .

  • charles gindville
    charles gindville Nov 27, 2014

    2011 gmc canyon crew 5 cylinder with 20,000 miles on it. I live in Philadelphia.The truck runs great on the road,but at idle or in gear it vibrates bad.Had it at dealership they tell me notjing is wrong because no codes are showing up.

  • Harold Siegwart
    Harold Siegwart Nov 27, 2014

    Let check the compression on all cylinders & see i f its a head problem ,another thing could be bad gas try some dry gas , also at night go out side under a dark engine and take a spray bottle and spray down the coils with water mist only and look for arks . If you find a bad one replace it .many codes clear them self's.hope for the best



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Expert
  • 37 Answers

A somewhat rough Idle can be usually found in a three cylinder car, thats okay. can it be tuning? does this happen with the AC on?

Posted on Nov 27, 2014

Testimonial: "I have a 5 cylinder and yes it happens when ac is on.the truck rides perfect on road but at idle it is rough more so in drive or reverse,it vibrates really bad ."


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2005 chevy cobalt

I had the same problem. Have it checked at an checkers with one of their computers. I had a multi misfiring. I changed the ignition module on it. It runs great now.

Posted on Dec 03, 2008

  • 1 Answer

SOURCE: P0302 #2 cylinder miss fire code. Replaced plugs

I have a 1999 ford escort 2.0, its got a miss on cylinder 3 and 4. I changed the wires and the coil pack but its still missing. When scanned I get code p1506, p0303 and p0304

Posted on Jan 11, 2010

  • 6 Answers

SOURCE: Engine runs rough at idle and slow speeds.

clean the idle air control with brake cleaner or carb cleaner

Posted on Jun 19, 2010

  • 1311 Answers

SOURCE: Rough Idle 2002 Trailblazer 4.2L could it be the

Clean throttle body first, make sure you disconnect battery foe about 30 minutes so PCM can relearn to cleaned throttle body.

Posted on Sep 11, 2010

  • 8841 Answers

SOURCE: 2000 grand cherokee laredo, 4.7

If your engine light is on, please get a free scan at your local parts chain and send us the trouble codes. Recommend you start by removing the idle air control valve and cleaning the valve and passages as well as the throttle body with carb cleaner. Check the operation of the valve by hooking up the connector and turning on the key (do not start the car) while it is off the engine to see if it actuates. Please let me know if you have questions.

  1. Remove air duct and air resonator box at throttle body.
  2. Disconnect electrical connector from IAC motor (#4 in picture).
  3. Remove two mounting bolts (screws).
  4. Remove IAC motor from throttle body.
  5. clean valve, passages, and throttle body (#2)


Posted on Nov 25, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Rough idol after idling long period ,but smooth's out after cooling off, until another extended idol it a coil breaking down

I don't know year--make--model? The basics for a rough idle is to check for a leak of some kind, fuel--egr--vacuum leak, something of that nature.

Any applicable trouble codes? Also, check and clean the idle air system, see if it helps?

Jul 28, 2015 | Cars & Trucks

1 Answer

Want idle on cold mornings.

Thinking possibly the air temp. sensor (mounted in the
air cleaner housing) Really need to see scan data to tell for sure
but that costs a fortune at a dealership.air temp sensor is fairly

Jan 16, 2013 | 2002 Ford Explorer

1 Answer

Hi, my1997 dakota with a 3.9 engine has a rough idle, has plenty of power i replaced plugs, wires, cap,pcv, rotor and added fuel cleaner. its a little better but still has a rough idle

My uncle worked at a dodge dealership as a head mechanic for over 30 years and he also found all of the 3.9 liter engines to have the rough idle. The rough idle cannot be explained but it can be made worse by buildup on the engine. I have a 2001 Dakota sport with the 3.9 and mine does it too and one of the first times i drove it it stalled and its not a Manuel transmission. But onc I changed the oil and put Lucas oil additive as well as regular additives to my gas every month or so it has reduced greatly and not stalled since. Hopefully you find this helpful.

Feb 28, 2012 | 1997 Dodge Dakota

1 Answer

Rough idle and code po1562

First u have to take it to ur car dealership they have scan tool the scan tool will read the fault code and tell u which part or sensor is in faulty that way it's easy fix

Jan 20, 2012 | 2001 Volkswagen Jetta TDI

1 Answer

2000 Impala:Hard start and couple times Idles extremly high

The car has OBD2 technology, You wont be able to tell without special tools. The ignition components, timing, CKP & CMP sensor, fuel line pressure, misfires, and fuel quality all need to be looked at. But to answer your question, "over 3x cranking' could be timing or fuel pressure. A bad IAC would cause a rough idle, and if the injectors were bad then it would cause a misfire too.

Jun 03, 2009 | 2000 Chevrolet Impala

1 Answer

2002 grand am 4 cylinder rough idle and rough running

Check the ignition control module. Sounds like the exact same problem I have had with mine. Took it to the dealership and the were able to tell me right away. The ignition control module is very easy to replace and is located on the top of the valve cover. Hope this helps!

Mar 18, 2009 | 2002 Pontiac Grand Am

3 Answers

Rough idle and shutting off at stop lights Stalls at stop light and has a rough idle at take off.

I would check the IAC or idle air control valve located in the throttle body of the engine. It looks like a big nut with black plastic in center and a wire on it. They get gummed up with carbon and become erratic remove and spray with carb cleaner. hope this helps please rate me

Jan 12, 2009 | 1994 Chevrolet C1500

1 Answer

1997 Integra Idles Rough

Does the car accelerate normally under heavy acceleration, or does it feel a bit lethargic?
Fuel economy?
Check engine lights?
Engine shaking at idle or other speeds?
Everything work on it (engine wise)?

Jul 08, 2008 | 1997 Acura Integra Type R

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

63 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

80339 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

john h

Level 3 Expert

15148 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides