2000 Chevy Suburban 2000 Suburban will not idle or accelera

Tiny
TCONTIC
  • MEMBER
  • 2000 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 105,000 MILES
My 2000 Chevy Suburban with 5.3l engine died today, it had been running great now I can't get it to idle and pressing the gas does not increase the RPM's. No warning signs, went from normal to bad in an instant.

The truck has about 105K no check engine light.

After it stalls I have to wait a few minutes to start it again and it will immediately not hold idle.

With the key on I pressed the value on the fuel rail and got a squirt of fuel so it seems to be getting to the engine.

I've had the truck for about four year, purchased it with 60K. Normal maintenance has included regular oil changes and air filters. Fuel filter has not been replaced.

I don't think my truck has a distributor, the plug wires are very short and each connects to it's own module.

Plugs and wires are new, I changed them this afternoon after the incident occurred because I had them in the garage and figured it couldn't hurt. Made no difference.

I removed the snorkel from the air cleaner to the engine and observed the flap opening and closing with the throttle.

When I turn the key the engine will start but the idle is low, it will stay steady low for about 15 seconds then start to cycle lower until it eventually stalls. Pressing the gas or opening the throttle manually has little effect, it still stalls.

Help!
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Saturday, March 6th, 2010 AT 7:45 PM

6 Replies

Tiny
RASMATAZ
  • MEMBER
Hi tcontic, Welcome to 2carpros and TY for the donation this is what keeps us going to help

Clean out the idle air control valve and EGR valve and test the throttle position and manifold absolute pressure sensor. Test the fuel pressure and also for an exhaust restriction-
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Sunday, March 7th, 2010 AT 2:47 AM
Tiny
TCONTIC
  • MEMBER
Please help me identifu the IAC and EGR valves. What is the cleaning procedure?

How would I test the other sensors mentioned?

I'll be checking the fuel pressure this morning, results will be posted shortly.

Tom
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Sunday, March 7th, 2010 AT 6:46 AM
Tiny
TCONTIC
  • MEMBER
Please help me identifu the IAC and EGR valves. What is the cleaning procedure?

How would I test the other sensors mentioned?

I'll be checking the fuel pressure this morning, results will be posted shortly.

Tom[/quote:53aebef36d]

Fuel pressure is 20psi, should be 40-60 psi. I'm going to replace the filter and see what happens to the pressure, filter is old for sure.

What next if that doesn't fix the pressure problem?

Tom
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Sunday, March 7th, 2010 AT 9:06 AM
Tiny
RASMATAZ
  • MEMBER
If its still low after the fuel filter replacement you have a weak fuel pump
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Sunday, March 7th, 2010 AT 12:16 PM
Tiny
TCONTIC
  • MEMBER
What should the pump sound like? Should it a smoorh whirring sound of a thumping? Mine is thumping.
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Sunday, March 7th, 2010 AT 12:37 PM
Tiny
RASMATAZ
  • MEMBER
Thumping don't sound good-it should be whirring or making a humming noise-
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Sunday, March 7th, 2010 AT 1:20 PM

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