Question about 2004 Chevrolet TrailBlazer

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Battery changed on 2004 chevy trailblazer and now it stalls out and idles really rough...any solution

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Sometimes the Computer [PCM] that controls the engine will loose it's memory on how you've driven it when power is removed. It should reset itself after a few miles of driving.

Posted on Mar 17, 2011

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What causes a rough idle on a 2002 chevy TB?


Disconnecting the battery sometimes corrupts the CPU program and it takes the use of a scanner to reprogram it . What you have done sometimes fixes the fault but like all CPU programs it only takes one bit to throw out the program.

Jul 22, 2014 | 2002 Chevrolet TrailBlazer

1 Answer

My 2004 Trailblazer started idling rough today. We changed the battery approx a week ago. How can we fix this? Thank you.


By chance, did it start idling rough while you had the defroster on, or the A/C? This is a very common problem after the battery is disconnected AND the defroster or the A/C is on. The defroster uses the A/C to dry the air. To fix this, spend about $7 on a can of throttle body cleaner. Disconnect your battery again, and clean your throttle body. After finished, reconnect the battery and drive for about 5 miles with the defroster or A/C off, this will allow the computer to reset and relearn the newly cleaned throttle body. When you changed your battery, you computer reset and thought the throttle body was clean, therefore you get rough idling when the defroster or A/C is on.

Jan 01, 2011 | 2004 Chevrolet TrailBlazer

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2004 Chevy Trailblazer idles rough. Idles ok when started up, but after warmed up it idles really rough when stopped.


If it has not pulled any codes (idiot light). Clean your throttle body, and change your spark plugs with A/C Delcos #41-103, most other brands will cause rough idle like Autolites and Bosch. This would be a cheap way to fix this problem.

If by chance you have just recently changed the battery or had the battery unhooked. Let me know, it's an easier fix that costs virtually nothing.

Nov 18, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

2004 Chevy Trailblazer We had to replace the


For the stalling issue, the throttle body needs to be cleaned, grime in this area prevents the throttle plate from closing completely and allowing air to enter, making the air/fuel mixture lean.
The dead speedometer could be a bad stepper motor in the instrument cluster or a bad speed sensor on the transmission. If the cruise control is not working, the problem is most likely the speed sensor.

Oct 15, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

I have a 2002 Chevy Trailblazer. Just replaced


If you unhooked battery it will need to relearn its idle position, should help if you clean throttle blade edge and body of carbon so proper amount of idle air can enter engine.

Feb 28, 2010 | 2002 Chevrolet TrailBlazer

2 Answers

Engine stalls


Assuming you have the correct size battery, this really shouldn't happen! I am assuming the engine is idling at fairly low RPMs, so when the AC kicks on, it kills the engine? It might be that you need to drive the car for a bit so that the engine computer can "relearn" your settings, which disappear when you change the battery. Or, when your battery died, one of your sensors might have gone with it. There is a idle sensor on most cars that raises the idle RPMs when the AC comes on.

Aug 30, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

Chevy Trailblazer 2003 ran the battery down now wont idle


try changing the air filter ,i had a problem ,at ilde in drive my trailblazer would stall, changed the air filter now it's not stalling and got my power back ,there is a secondary air pump that i have to change ,
not sure were it is ? still not running perfect but it's running better .and my service light is on too.
i got it put on scope ,it's the pump .
not sure if this helps ,but i'm start to run in to problems too,i have a 2004 trailblazer.
i like to do fix things myself ,i hope i can.it's the cost if you know what i mean.

Dec 17, 2008 | 2004 Chevrolet TrailBlazer

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