Question about 2004 Chevrolet TrailBlazer

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

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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.

Posted on Jan 01, 2011

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Heater stopped working loss of coolant and rough Idle


I had a similar experience. Finally the car started overheating. Turned out the thermostat went bad and the radiator blew a leak. Had those replaced. Runs great.

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1996 dodge caravan 2.4 code p1294


on dodge motors
fitted a lot of parts and still no better

the fault code clears and comes back as a intermittent problem

could be electrical voltage drop off or heat related failure

i wonder if your 02 sensor ,the catalytic converter
or other related sensors
are causing the fault to come back
if needed .....fit a new air filter...

how the test is determined

P1294-TARGET IDLE NOT REACHED 3.3L/3.8L
When Monitored and Set Condition:
P1294-TARGET IDLE NOT REACHED 3.3L/3.8L
When Monitored: With the engine idling and the transmission in drive, if automatic.
There must not be a MAP sensor trouble code or a Throttle Position Sensor trouble code.
Set Condition: The engine idle is not within 200 rpm above or 100 rpm below the target
idle for 40 seconds. One trip fault.

POSSIBLE CAUSES
INTERMITTENT CONDITION
IAC MOTOR PASSAGES
VACUUM LEAKS
AIR INDUCTION SYSTEM
THROTTLE BODY AND THROTTLE LINKAGE
TEST ACTION APPLICABILITY
images-trsfwikau0d5dnlwn4zno1ix-3-0.jpg

Mar 01, 2017 | Cars & Trucks

1 Answer

Why does my 2004 Trailblazer run rough at stops and AC is on? Doesn't stall and temp. is fine. Also idle gage seems fine. It also sputters when shutting engine off. Just had the motor mounts...


ONe of the "easy" fixes is buy a can of throttle body cleaner. Remove the air intake near throttle boddy and clean the inside of throttle body as best you can this should help it. If it doesnt have it checked out it could be more advanced problem. Good Luck.

Sep 09, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

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


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.

Mar 17, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

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

1 Answer

My 2002 Trailblazer idles rough with the AC or defrost on when stopped. It rides fine while the car is moving. I changed my battery a couple of months ago and then the problem started. Thanks for your help


I would suggest having the Alternator checked for the proper amp output. Although it may be making enough power to keep the battery charged, it may not be making enough to power the vehicle and still be the reason the engine performs rough at low RPM's under accessory load.

Oct 29, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

ROUGH IDLE


Did you replace the plugs with the same plugs (Manufacturer) as the plugs you had in there. Some cars are very picky with plugs. ie: some Japanese cars will only run well with NGK Spark Plugs. Try to use only what Subaru recommends in your engine for the best performance.

Jun 06, 2010 | 1999 Subaru Forester

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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