2001 CHEVY S-10 STALLING, ROUGH RUNNING, LOW IDLE

  • Tiny
  • jasharp
  • 2001 Chevrolet S-10

Engine Performance problem
2001 Chevy S-10 4 cyl Two Wheel Drive Automatic

Truck stalls, has extreme low idle, sometimes stalls as I am driving down the road. When thei happens sometimes it starts up first try, other times it takes 5 or 6 tries. Sometimes it runs as if it is starving for something, fuel, air whatever, like it's gasping for something.

I've replaced the fuel pump, fuel filter, the icm, the ect, the crank shaft sensor, the iac, and I've cleaned the throttle body. Nothing has helped.

What's causing this problem?

Wednesday, December 23rd, 2009 AT 12:07 AM

6 Answers

  • Tiny
  • mmprince4000
  • Expert
  • 8,715 posts

Start by having a back pressure test performed on the convertor, or if bolted on, remove bolts and visually inspect interior.

If you see melted material, then CAT is clogged.

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Wednesday, December 23rd, 2009 AT 8:31 AM
  • Tiny
  • jasharp
  • Member

The cat converter was replaced about 4 months ago. So that's not the problem.

Any other ideas?

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Wednesday, December 23rd, 2009 AT 5:22 PM
  • Tiny
  • mmprince4000
  • Expert
  • 8,715 posts

The low idle is either a timing issue (retarded) or lack of air to engine.

Check throttle body plate. See if it is bent, possibly caused by a backfire.

Next check timing with scanner, if below 20 degrees, then it may be the crank ring that the crank sensor reads.

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Thursday, December 24th, 2009 AT 8:37 AM
  • Tiny
  • mmprince4000
  • Expert
  • 8,715 posts

One other thing that will cause the idle problem is an open EGR valve.

I would remove and clean it and the base, if sticking it will cause a low idle and stalling, poor running.

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Friday, December 25th, 2009 AT 9:05 AM
  • Tiny
  • jasharp
  • Member

This truck, 4 cylinder, doesn't have an EGR valve. There is a place on the side of the motor where it would bolt on if it were on some different vehicle but this one just has a flat plate to cover up that hole.

Would a clogged mufler cause these kinds of problems?

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Saturday, December 26th, 2009 AT 7:52 PM
  • Tiny
  • mmprince4000
  • Expert
  • 8,715 posts

Anything that would restrict exhaust flow would cause driveability problems. Depends on the extent of the restriction.

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Monday, December 28th, 2009 AT 8:48 AM

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