trailblazer not idling - Engine Troubleshooting


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trailblazer not idling

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jfred
New User

Mar 2, 2010, 6:31 AM

Post #1 of 5 (1274 views)

trailblazer not idling	Sign In

2003
chevrolet
trailblazer
vortec 4200
over 80,000 miles
I was driving around one day and made a stop at the store,when I got back in the truck my battery was competley dead.After I replaced the battery ,I noticed that the truck will not Idle properly ,when it warms upthe idle speed drops and then surges. if I let idle on its own ,it will then soon die. I thought maybe the alternator was going bad but all the lights seem to be just as bright as they ever were,and the power windows dont seem to be slowed any.All fuses are good and I havent seen any loose wires or vacumm lines.All suggestions will be appreciated

nickwarner
Veteran / Moderator
nickwarner profile image

Mar 2, 2010, 8:54 PM

Post #2 of 5 (1270 views)

Re: trailblazer not idling	Sign In

is the engine light on?

Sidom
Veteran / Moderator
Sidom profile image

Mar 2, 2010, 10:34 PM

Post #3 of 5 (1268 views)

Re: trailblazer not idling	Sign In

A couple of things you can try. Since you just replaced the battery, sounds like it may be a relearn problem. If you drive it for a day or so it will probably relearn on it's own.

The second & best thing would be to clean the throttle body. If it gets too dirty the comp will compensate for it over time, problem being when the battery is disconnected it goes back to factory default settings which is now too low for the dirty throttle body resulting in dying at idle.

jfred
New User

Mar 3, 2010, 8:02 AM

Post #4 of 5 (1265 views)

Re: trailblazer not idling	Sign In

I appreciate this answer .Took the answer ,applied it and now the engine runs smoother,still had a annoying problem else where but that seems to fixed itself .Again thank you very much

Sidom
Veteran / Moderator
Sidom profile image

Mar 3, 2010, 10:13 PM

Post #5 of 5 (1263 views)

Re: trailblazer not idling	Sign In

Glad to hear you got it going.......Thx 4 taking the time to come back & let us know how it worked out.

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