Question about 2002 Chevrolet TrailBlazer

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Car will turn off if A/C is running when i stop or in park

I had a similar situation, but i was told something about my idle air control switch..

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Have the battery and alternator checked. Sounds like there is not enough voltage to run everything, therefore the fuel pump ( needs atleast 10 v ) shuts down.

Posted on Jul 29, 2009

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2003 Ford Explorer XLT Wants To Stall At Low Idle,, especially when at a stop light


How does it idle in park , does it run ruff or smooth? Are any lights lit on the dash , check engine etc. ? Could have a partially plugged IAC air passage .idle air control (IAC) valve ! The engine computer uses the IAC to control idle , when under a load such as when put into gear the computer raises the idle ! It does this by allowing more air to by pass the closed throttle into the engine raising the idle ! If these air passages clog they restrict the air flow an cause a idle problem ! Now if it runs ruff at idle in park you could have vacuum leak ! Rough Idle How to Fix Ford Taurus Engine Stalls at Stop Signs

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Symptoms 2000 kia sportage Symptoms 2000 kia sportage does not do all the time. Starts runs well but driving road 50mph almost as if ignition shut off split 2nd. Stop car and while running in drive s


Some makers used Vacuum releases for their emergency brakes which had a Vacuum switch connected to the shift assembly. This would account for a stumble if Vacuum vented out through this switch.

More common for shifting stumble to occur from Park to Drive, engaging a load on the engine, not to stumble to a freewheeling Park position. Sounds like idle speed control is sluggish to stabilize the motor.

You also have idle speed control problem with A/C, kind of shows that A/C was what kept the engine running because when you turned the A/C off, the car died.

I am going to give you some Websites for wiring diagrams. Alldatadiy.com amd Autozone.com with free wiring info upon registering your vehicle.

It seems that the base Idle speed control is not working and the A/C idle speed control is.

Also check for Vacuum leaks on the intake manifold by spraying water from a pumpbottle on the seams of the gaskets.

Check ignition Relay or ignition switch for random cutouts. The fusebox layout is on the Autozone site.

I hope my solution helps.

Sep 09, 2012 | 2000 Kia Sportage

2 Answers

Runs fine in park as soon as you put in reverse or drive it stalls


There are so many things that could be causing this, but I can tell you about the last vehicle that did this to me. It was the idle air control valve (IAC). Some vehicles have something named a little different, but both are for the same purpose. It basically tells the car how many rpms are running, what kind of load is on the engine, etc. It controls the air to fuel mixture in the intake, and if its off, then when you go to put it in gear, the load on the engine alone will cause it to die. It will also do this sometimes when the a/c gets turned on, or you turn the vehicle and your power steering puts load on the engine. I dont know if any of this sounds like your situation, but it was very frustrating for me. Hope this helps out some how.

Dec 31, 2009 | 1994 Ford Taurus

1 Answer

My 1997 lesabre runs fine until Im at a stop then it idles ruff it is less sever when in park but bad when im stop using the brakes


Could be the Idle Air Control if so equipped. The smoother idle is because when in neutral or park, there is no drag on the engine from the transmission.

Aug 13, 2009 | 1997 Buick LeSabre

1 Answer

My 1999 grand am gt 3400 h.o hesitates from idle and stalls if i stop or park on a hill and will do it over and over till i power break it to get out? It starts right back up but is very irritating? Have...


Sounds like a dirty mass air flow sensor but the hill thing is strange...Is the tank full when this happens? Could be a filter and would not hurt to change it (often neglected).

Jul 16, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Engine dies at all speeds


I suspect an IAC (Idle Air Control) valve fault, or it could just be that the idle speed requires adjustment. Have you had a flat battery or a battery replacement recently? This can cause the computer to loose its learned idle settings and bring up these sort of issues. The idle should relearn itself in this situation after a few days, but sometimes requires resetting properly.
A competent auto technician should be able to diagnose and rectify a fault like this quickly, the idle systems are not too complicated on these vehicles.

Mar 03, 2009 | 2001 Ford Taurus

5 Answers

2000 toyota echo dies in gear


Sounds like a vacuum problem with the transmission. Modulator maybe?
Take it to an auto trans specialist.

Jan 07, 2009 | 2001 Toyota Echo

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