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Chevrolet TrailBlazer Start Stall and Idle Problems



  • Recently (about a month ago) I purchased a 2003 trailblazer LT with 67000 miles, it had been driving great, until about a week ago. I go to start it and it cranks but will not catch. I leave it alone for about an hour I believe I try again and it starts right up and was fine for about a week. Then same thing happened this time I kept trying over and over to get it to start for about close to an hour and then finally I was able to get home. It just seemed odd that it trying to crank but will not catch almost like it wasnt getting fuel, Im going to have someone look at it but in the mean time was wondering if anyone had any ideas as to what the problem could be? Thank you for any information
  • I am glad to hear that I am not the only one having issues with my 2003 Trailblazer LT, over 100,000 miles. When trying to start the vehicle all of the lights will come on it will try to crank over but won't start, put in a new battery, turn the key and it still won't start on 1st try, may have to try 5 or 6 times before it will catch. and can't step on the gas because it acts like it will flood. When it starts finally, it runs fine. Anyone with any ideas what might be wrong, advice is appreciated.
  • Car would not start, check battery, found to weak to start car, had jumped. When home and removed and replaced with new battery, First start car almost stalled out but RPMs came up and idled fine. This morning started up fine but did same thing with idle. When drive would stall out unless put into neutral, idle still low.
    No check engine light (yet). But did have before (on and off) battery replaced.
  • Mine has the same problem for the last 2 months. When the a/c is turned on at idle it stalls. Just other day it went away and now idles fine with the a/c on. ??????????????????????????????
  • burdawgburdawg Posts: 1,524
    Idle air control valve? Over time, gunk builds up and they get sticky. I haven't had to service or replace the one on out TB, but I have on the Durango with about the same mileage.
  • autoacessgaragautoacessgarag Posts: 1
    edited September 2010
    Disconnecting your battery has allowed the PCM to reset to original factory default settings. Unfortunately, your throttle body is dirty, but you didn't know it until now because the PCM has been altering the way the engine runs to compensate for it.

    Now that the computer thinks everything is great, it's not taking into account how dirty the Throttle Body is, and that's where your getting the bad idle.

    Remove and clean the throttle body as soon as you can, (and yes, disconnect the battery while you do it again), and after it's all clean and you reconnect the battery, all should be well.:

    here's the "how to":
  • Lately every 4 or 5 starts my 2002 Trailblazer won't turn over at all. Power locks don't work, can't pull key out of ignition, and buzzing sound comes through speakers. Also a noise coming from back seat fuse box. (Not sure if it's related, but the temp/compass display went out a couple weeks ago.) I can't manually lock the door when this happens either. I've checked the fuses, DH replaced the ignition switch. Any other ideas? Right now I just want to whack it with a baseball bat. :mad:
  • mykewmykew Posts: 1
    If your still having the problem, replace your ignition switch.
  • engrjamengrjam Posts: 2
    any answer to this I have the same issue!!
  • takincare_1takincare_1 Posts: 1
    edited September 2011
    Does anyone have this problem? turn ign key to start, solenoid clicks, turn key off and try again. Nothing. No dash lights and key stuck in ign. I jiggle wires down by starter and/or remove postive batt terminal, replace postive batt terminal and then dash lights and eventually engine starts. TB does this more often that it used to. If you have had this exp. let me know what to do.
  • I have to tighten the battery terminals every few days. Don't ask me why they always come loose, but that seems to be the problem. :lemon:
  • You may have a bad cell in your battery. I had a similar issue a few years ago and ended up replacing with an Optima battery and have not had any battery related problems since.
  • if your t/b hasn't already "fixed" itself, try disconnecting the negative battery cable for ten minutes. be sure ALL accessories are off. reconnect the negative cable, and let engine idle for at least 10 minutes while all the computers read their sensors and 'talk' to each other. this goes for all posts involving recent battery change outs, or disconnecting for anything over 2 or 3 minutes. hope this helps
  • some others like this were ok after the ignition switch was replaced. heavy keychains can cause damage to the switch. suggest separating keys, etc so you have 2 sets, one for house and car remote, the other for car keys only. this also reduces the possibility of locking your remote in with your keys. part $50, labor $100. new ones at gm have been updated. hope this helps several posters. :)
  • I have an 04 Trailblazer and I had the same problem.. I had to have the battery replaced and it started doing that.. We figured out the problem an 04 doesnt have a memory saver on the battery so the cheap way to fix it is to take the throttle body off and clean it. Because it has no memory saver when we took the battery off it made the car think it was brand new. a memory saver is like $100.. But ever since we cleaned the throttle body we havent had any other problems.. We got this information from a dealership..
  • steverstever Posts: 52,683
    The memory savers I've seen are little 9 volt battery gizmos that plug into a powerport. Haven't looked lately but I remember seeing them for around $15 and up. Good mechanics use them so you won't lose your computer settings or radio settings when the battery is disconnected for whatever reason.
  • ksperleksperle Posts: 1
    My trailblazer is doing the very exact thing you describe...did you ever conclude what the problem was?? HELP
  • I have to clean and tighten the battery terminals often. I keep a wrench in the car for just that reason.
  • I have a 2002 trailblazer and it has had a similar problem for years and no one has been able to solve it. tkazee, did you ever figure this out? My car starts fine when it's cold and fine just after it was shut off. But if the engine is hot and you stop for 10-15 minutes, it acts flooded and won't start. Then I must wait until the engine is cool and it starts. If I can get it started when it acts flooded it will sputter and miss for a bit (as if flooded) until it finally runs right. Anyone have the answer?
  • marko70marko70 Posts: 1
    Air conditioning works well but when slowing down to a stop at idle, it will stall out or idle up and down and try to stall out is this a vaccum or a carbon build up problem?

    Thanks Mark
  • booner10booner10 Posts: 1
    My 2002 trailblazer died while driving and now the engine won't roll over. My starter relay will not kick in but the relay is good and I bypassed the relay with the ignition switch in the run position and rolled the engine over but no fuel or fire, and yes the ignition switch is good. Is it the PCM?
  • c4rc4r Posts: 1
    Did you ever get your problem fixed or did it go over the cliff...?

    I have a 2004 @ 80k that is developing a rough idle.. just changed the air filter and want to change the oil and include some ProLong.. I use in my C-cars.

    Just wondering where we are headed here...
  • We did not solve the Trailblazer problem. We did learn that the compression is a little low, but the wet test compression is normal, so the loss seems to be in the pistons. However, it does not use much oil. I have been adding Marvel Miracle Oil to the gas and it runs better. My solution for now is to keep driving it.

    This car also seems to have a history of a vacuum leak at the top of the gas tank. We replaced all those parts, but the rough idle did not go away.
  • take the throttle body off and clean it, took care of my same problem, I would pull up to a stop light and the engine would die. Now it runs great. 180,000
  • I'm having a similar problem but without the air. I only have the problem when it very cold out. Starts right up, runs, then the idle decrease and stalls. Starts back up and after a few times and once it's warmed up, it runs fine. Only in the winter and when it's below freezing. Had the throttle body cleaned. Have had a vapor code on for years but told it's not connected. Any ideas? 2006
  • wbradbury1wbradbury1 Posts: 1
    edited December 2013

    i have a 1999 chevy trailblazer, crank over but will not fire up ,replaced fuel filter it started right up . drove it 5 or 6 times now it is back to not starting up.

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