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'03 Chevy TrailBlazer Runs Rough


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Shedder1
User

Jun 22, 2017, 12:20 PM

Post #1 of 7 (773 views)
'03 Chevy TrailBlazer Runs Rough Sign In

I have a '03 Chevy TrailBlazer 4.2L with 190000 miles on it. I changed the battery 9 months ago and since then noticed that my SUV was running rough and has a miss. When I turn the AC on it really has a hard time keeping an idle, and seems to miss a lot more. Since then it has had a tune up. Plugs, 3 coils where also replaced, fuel filter, air filter were both changed.I don't know what is making it run rough. Help...


(This post was edited by Shedder1 on Jun 22, 2017, 3:42 PM)


Discretesignals
Ultimate Carjunky / Moderator
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Jun 22, 2017, 12:28 PM

Post #2 of 7 (769 views)
Re: Runs Rough Sign In

How does it run when your cruising or accelerating?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jun 22, 2017, 12:29 PM)


Sidom
Veteran / Moderator
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Jun 22, 2017, 12:47 PM

Post #3 of 7 (756 views)
Re: Runs Rough Sign In

Is the check engine on or has come on at any point?....If so pull the codes and post them...


Shedder1
User

Jun 22, 2017, 3:25 PM

Post #4 of 7 (744 views)
Re: Runs Rough Sign In


In Reply To
Is the check engine on or has come on at any point?....If so pull the codes and post them...

I get no check engine light , I even check to see if any codes were there. no codes.


Shedder1
User

Jun 22, 2017, 3:33 PM

Post #5 of 7 (742 views)
Re: Runs Rough Sign In

It runs fairly well, until I put the AC on then you can really tell the difference. It runs a lot rougher and doesn't accelerate as good as it should or did before...


Hammer Time
Ultimate Carjunky / Moderator
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Jun 22, 2017, 3:36 PM

Post #6 of 7 (738 views)
Re: Runs Rough Sign In

If you have no codes, then you likely have no misfire. You might want t0o look into worn motor mounts causing vibration or idle control not keeping the idle steady.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
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Jun 22, 2017, 7:07 PM

Post #7 of 7 (718 views)
Re: Runs Rough Sign In

Have you cleaned the throttle body? If you disconnect the battery, the PCM learns on the dirty throttle body and it will idle low and may stall when ac is engaged.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.






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