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engine stalls

biggs40

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biggs40 New Member

biggs40

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I have a 2002 Avalanche 2500 8.1L 4X4. It has 56k miles. The problem I'm having is odd. While driving, more on wet, cold days, my truck will studder. Sometimes it will stall right out. When this acts up the tach drops (like power loss) and battery light comes on. The trans act like it dis-engages, then re-engages. If it stalls, it usually starts right back up. I keep hearing from the dealer, possible ignition switch, but forums lean to Crank Postion Sensor. How can I tell which to do? :D

I had a remote starter(removed), had Hypertech Power programmer(Removed), and K&N cold air kit(still in). New battery and BCM also replaced.

Wingnut Senior Enthusiast

Wingnut

Posted
Posted

The 8.1s definately have/had a problem with the crank position sensor, it's pretty common for them to just shut the truck off when you're driving down the road...Or it just refuses to start.

 

But that doesn't sound like what yours is doing.

 

I would steer towards electrical system. Things like the battery cable. It may look good on the outside, but can be rotten to the core. When it starts to go, it will do all sorts of funky things with the instrument panel, and the way the truck runs. I've replaced quite a few of them.

 

Just a thought :D

 

Welcome to the forums, by the way :loser:

Haulin' 8.1 Enthusiast

Haulin' 8.1

Posted
Posted

If it's the crank sensor you'll have a code stored in memory, and if it's been doing it as much as it sounds the check engine light would be on.

 

An ignition swith won't leave a clue like that.

 

Vernon

biggs40 New Member

biggs40

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If it's the crank sensor you'll have a code stored in memory, and if it's been doing it as much as it sounds the check engine light would be on.

 

An ignition swith won't leave a clue like that.

 

Vernon

 

 

 

 

 

My concerns with ignition switch being the problem, is that it appears to be weather related. It also is not affected by bumps or taps on the dash or steering wheel area?

jamey777 Enthusiast

jamey777

Posted
Posted

I had 01 silverado z-71 and the same thing happened to it, the engine would stall and the trans would stay in the same gear till I shut it off and restarted it. When this happened the guages would all freak out and drop to 0 and then back on. It's the ignition switch. That fixed it. There were no codes in the computer when they hooked it up, luckily I got a mechanic that had seen this problem before.

  • 2 weeks later...
97gmc2500 New Member

97gmc2500

Posted
Posted
I had 01 silverado z-71 and the same thing happened to it, the engine would stall and the trans would stay in the same gear till I shut it off and restarted it.  When this happened the guages would all freak out and drop to 0 and then back on.  It's the ignition switch.  That fixed it.  There were no codes in the computer when they hooked it up,  luckily I got a mechanic that had seen this problem before.

 

 

 

 

 

I worked for gm dealer its most likely the ignition switch. saw many vehicles with same problems ign. switch was the cause.

 

scott

  • 4 weeks later...
biggs40 New Member

biggs40

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:withstupid: Well it's been a month on a new CPS and my truck runs awesome and doesn't miss a beat. Even feels like I gained some Horsepower. Hope it stays that way.

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