2002 Trailblazer rough idol - Engine Troubleshooting


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2002 Trailblazer rough idol

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

1sharpguy
New User

Nov 7, 2010, 6:18 PM

Post #1 of 3 (3565 views)

2002 Trailblazer rough idol	Sign In

Vehicle: 2002 Chevy Trailblazer; 6-cylinder; 91,000 miles. Today I replaced the wiper motor on my 2002 Chevy Trailblazer. Prior to doing the work the vehicle idol was fine. After the finishing the work, the vehicle idol was off. Prior to the work the vehicle idoled around 1000 RPM. After the work, the vehicle idol dropped below 500 RPM. While doing the work, I disconnected the negative battery terminal. It was disconnected for about two hours. Could disconnecting the battery terminal have caused a problem for the engine tuning. Is the rough idol problem a coincidence or by disconnecting the battery did I do something to the engine electronics which is playing havoc with the engine idol/tuning? Thanks.
P.S. If the battery disconnection threw the engine electronics out of wack, is this something I can fix myself or do I need to take it to a mechanic or dealer to be repaired?

(Full disclosure...I am not technically savy or experinced in electronic engine tuning!)

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 7, 2010, 6:31 PM

Post #2 of 3 (3559 views)

Re: 2002 Trailblazer rough idol	Sign In

Whenever the battery is disconnected the computer loses all it's "learned" adaptive memory. It has to learn the idle strategy all over. It should be fine after driving it normally for a while.

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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.

1sharpguy
New User

Nov 7, 2010, 6:54 PM

Post #3 of 3 (3555 views)

Re: 2002 Trailblazer rough idol	Sign In

Wow...who would have thought. I'm okay with nuts and bolts, but electronics unnerve me. Awesome forum!! Thanks so much for the help/advice. Nice to get such a quick response.

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