Question about 2004 Chevrolet TrailBlazer

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When i turn the heat on my engine revs go so low the truck will stall can you give me an idea what might be wrong

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The idle control valve is faulty common for chevys they know about it. it should be a recall by now. and if not the whole piece is about 500 usd

Posted on Nov 20, 2009

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Posted on Jan 02, 2017

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Replaced fuel pump but still revs up the engine and shuts off?


There is gas, the starter is fine, the battery is good. It doesn't matter what temperature the engine is or how long between starts but if I rev up the engine while cranking it starts okay. Rarely I have to rev at stops or the idle drops too low and stalls. If I punch the gas very quickly it revs and drops quickly and then stalls. Starting has a success rate of about 50% without revving. If it stalls, I must rev the engine to start.

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reg codes only work in UK, use real years..... so ROTW can tell.
please, tell what it does good and bad driving, idling , parked, moviing
hot and cold engine, full power from engine on hills.
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when an engine is cold the RPM is very high (iAC device) and it will not stall cold , if it does that is key.
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I have a 2001 Subaru Outback. Today it stalled on my way home and I was able to restart it. I thought maybe my oil was low so I added some. It stalled again this evening when my husband was driving and we...


I would have the head gasket checked.
When the engine is cold check the rad and overflow bottle.
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You will have to give a little bit of time on this one. The over heating coming up through the vents, sounds like your heater core. Now the temp gauge not working may be a sending unit (which one I am not sure there is three of them). The sports light I have never heard of that before. Now the car stalling and not turning back on could be a few things like, clogged or catalitic converter, or crank shaft sensor just to name a couple. The speedometer working only part of the time is usually the speedometer gauge in the dash but if it don't work at all it's probably a snapped speedometer cable or even a loose one.

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vacuum leak......bad tps.......bad mass airflow meter system........any of those are suspect...... also check for bad ground at battery to be sure all is not computer freak out from bad readings ...good luck

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