Rough idle - Pontiac G6 Forum
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post #1 of 23 (permalink) Old 04-26-2012, 07:32 AM Thread Starter
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Rough idle

Hey guys so I have a 2006 Pontiac g6 3.5 4 speed auto, I just replaced my spark plugs and spark plug wire and my car is idle very rough when I come to a stop the rpm needle is jumping from about 700 to 800 and I ran my code reader it said I have a misfire in cylinder 4 so I took out my plug and reinstalled it and it not running the code anymore but it's still running rough any suggestions?
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post #2 of 23 (permalink) Old 04-26-2012, 07:56 AM Thread Starter
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And she's got 194000k on her so warranty is not an option
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post #3 of 23 (permalink) Old 04-26-2012, 09:38 AM
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How was it running before you replaced the plugs and wires? Is it possible you swapped some wires? Maybe a wire is loose on the plug or on the coil, All the plugs are nice and tight and gapped correctly? Also all went in without cracking I hope. I had a cracked spark plug cause quite a bunch of issues.
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post #4 of 23 (permalink) Old 04-26-2012, 10:11 AM Thread Starter
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She was running the same way before I did the spark plugs and wires that why I changed them and I installed them all good and checked all the plugs last night and I bought pregapped plugs and checked them before install as well
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post #5 of 23 (permalink) Old 04-26-2012, 11:58 AM
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very rough idle

There are many possibilities.

So it runs fine except while idling?

Could be an intake air leak that affects #4 more than the others.

Could be a bad/clogged #4 fuel injector.

Ever cleaned the MAF sensor & throttle body?

Did any work occur just prior to the onset of the symptoms?




Last edited by greenman; 04-26-2012 at 12:00 PM.
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post #6 of 23 (permalink) Old 04-26-2012, 12:14 PM Thread Starter
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Yes well driving it's fine and im going to clean the The Maf sensor and throttle body this weekend and I ran a system leakage test and it appears there's no leaks, and no there was no work done prior to the rough idle, and let's say it is an injector how difficult would they be to change? Or is there a cleaner that will really do the job? Mind you I'm in Canada I may not e able to get everything the states has
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post #7 of 23 (permalink) Old 04-26-2012, 01:02 PM
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Quote:
Originally Posted by GoldG6 View Post
Yes well driving it's fine and im going to clean the The Maf sensor and throttle body this weekend and I ran a system leakage test and it appears there's no leaks, and no there was no work done prior to the rough idle, and let's say it is an injector how difficult would they be to change? Or is there a cleaner that will really do the job? Mind you I'm in Canada I may not e able to get everything the states has
Very rough idle but runs fine at higher RPM:

Air:
That sounds a lot like an intake air leak that affects #4 more than the others. A scan tool would tell you what's happening to the fuel trim...unfortunately most folks don't own one.

Fuel:
I wouldn't replace anything until you verify it's condition. Since it's #4 you have it easier. Start with an injector resistance test on #4:

Spark:
Verify you have good spark from plug #4 at idle.



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post #8 of 23 (permalink) Old 04-26-2012, 05:17 PM Thread Starter
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Ok I'm going to run a scan again I'll get the fuel trim numbers, do you know the numbers it's surrposed to be at? And I'll check my spark as well, I'll have to post tomorrow because I do not have service out at my place and thank you for your help so far
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post #9 of 23 (permalink) Old 04-26-2012, 05:39 PM Thread Starter
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It stops Idolling rough when I turn my heat or ac on
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post #10 of 23 (permalink) Old 04-26-2012, 06:10 PM
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Quote:
Originally Posted by GoldG6 View Post
Ok I'm going to run a scan again I'll get the fuel trim numbers, do you know the numbers it's surrposed to be at? And I'll check my spark as well, I'll have to post tomorrow because I do not have service out at my place and thank you for your help so far
What scan tool do you have?



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post #11 of 23 (permalink) Old 04-26-2012, 06:34 PM Thread Starter
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C reader
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post #12 of 23 (permalink) Old 04-26-2012, 06:35 PM Thread Starter
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I can look up everything on it
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post #13 of 23 (permalink) Old 04-26-2012, 07:05 PM
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It stops Idolling rough when I turn my heat or ac on

That's strange. Usually it's the reverse. Is this effect immediate (no time delay between turning ON the a/c & the engine idle smoothing out)?




Last edited by greenman; 04-26-2012 at 07:23 PM.
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post #14 of 23 (permalink) Old 04-26-2012, 07:42 PM Thread Starter
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No it smooths out right away without hesintation and my check engine light came on again so I'll see what it is when I get home and scan it
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post #15 of 23 (permalink) Old 04-26-2012, 07:49 PM Thread Starter
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So it doesn't smooth out completely when I turn on heat or ac but it smooths put in comparison.
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