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2002 8.1 Stalls While Driving.

02 8.1 HD

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02 8.1 HD New Member

02 8.1 HD

Posted
Posted

Hey guys, I have a 2002 2500HD Silverado with the 8.1. Lately it's been stalling on me while driving. If you guys could help diagnose the problem I'd appreciate it. While driving any speed, turning, straight line, at a stop, anything, the truck will just randomly stall and i'll lose power steering and everything (obviously). However when I start the truck up again mere seconds after stalling, it fires right up like nothing happened. What could this be guys? I'm clueless, I'm thinking the fuel pump or something along those lines, but I'd assume if it was the fuel pump it would stall ALOT more than it is. Maybe the alternator or something? I'm at a loss, as I'm no mechanic :) . Any help would be appreciated guys.

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

Crank Position Sensor. Common problem on early 8.1's. They went to a new design.

 

DEWFPO

braxx Enthusiast

braxx

Posted
Posted
Hey guys, I have a 2002 2500HD Silverado with the 8.1. Lately it's been stalling on me while driving. If you guys could help diagnose the problem I'd appreciate it. While driving any speed, turning, straight line, at a stop, anything, the truck will just randomly stall and i'll lose power steering and everything (obviously). However when I start the truck up again mere seconds after stalling, it fires right up like nothing happened. What could this be guys? I'm clueless, I'm thinking the fuel pump or something along those lines, but I'd assume if it was the fuel pump it would stall ALOT more than it is. Maybe the alternator or something? I'm at a loss, as I'm no mechanic :) . Any help would be appreciated guys.

 

I had the same symptoms. I just replaced the Crank Sensor tonight. It fixed the issues and fixed the hesitation that I've had since I bought the truck.

yukon25008.1 Senior Enthusiast

yukon25008.1

Posted
Posted

were is the c p s..located? is it easy to change, and is it something i should worry about on an 04 8.1 with 70,000

  • 1 month later...
tim73 Enthusiast

tim73

Posted
Posted

Might want to check fuel pressure first. But itis probably the crank sensor. It is on the back of the engine. Difficult to get to. Has one bolt holding it in...and the theres an oring...maybe two. Just make sure it comes out in one piece.

JF1957 Enthusiast

JF1957

Posted
Posted
Crank Position Sensor. Common problem on early 8.1's. They went to a new design.

 

DEWFPO

 

 

Does 2004 8.1L an early one ?

JF1957 Enthusiast

JF1957

Posted
Posted
Crank Position Sensor. Common problem on early 8.1's. They went to a new design.

 

DEWFPO

 

 

Does 2004 8.1L an early one ?

 

Nobody knows if a 2004 8.1 is in the early ones ?

JF1957 Enthusiast

JF1957

Posted
Posted
Crank Position Sensor. Common problem on early 8.1's. They went to a new design.

 

DEWFPO

 

 

Does 2004 8.1L an early one ?

 

Nobody knows if a 2004 8.1 is in the early ones ?

 

Wander were is DEWFPO, just want to know if i ad to worry about that issue ? :thumbs::cry:

vettelovralexand Enthusiast

vettelovralexand

Posted
Posted
Crank Position Sensor. Common problem on early 8.1's. They went to a new design.

 

DEWFPO

 

 

Does 2004 8.1L an early one ?

 

Nobody knows if a 2004 8.1 is in the early ones ?

 

Wander were is DEWFPO, just want to know if i ad to worry about that issue ? :thumbs::cry:

 

 

They all pretty much have problems, however the only year which was recalled for it was 2001. If I started to have issues with an 8.1 stalling or stumbling, it would be the first thing I would check on. Otherwise they have the same fuel sender problems as most other GM trucks and I would check that next or possibly a fuel filter. Stubby 10mm wrench to get the sensor out from the top of the back of the block on the driver's side (you will want to use penetrating oil on it first). You should do a crank relearn after this but it is not 100% necessary.

Shooter_va Enthusiast

Shooter_va

Posted
Posted
Has anyone ever broke the cps while taking it out, if so how did you get it out.

Mine broke, but was still held together by the three wires. The bottom O-ring got hung up, used some more penetrationg oil and carefully drove it out....got lucky.

Kirkathon25 Enthusiast

Kirkathon25

Posted
Posted

it is behind your starter, very easy to fix i just swung mine out of the way, i cant believe how expensive it was tho it was like 60 bucks for a part the size of a golf ball

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