1999 Chevy Suburban 1999 Suburban won't start

Tiny
HEATHERH1999
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 20,900 MILES
Our Suburban will not start. The fuel filter has been changed, the plugs were changed, the fuel regulator pump has been changed, the fuel pump is working and has good pressure, and now yesterday we replaced the coolant temp sensor upon the advice of a guy at our local auto store. We can get it to start if we prime it with gas and it runs great. The problem is if you let it sit for more than an hour it will not restart on it's own. Any thoughts on what to check next?

Heather
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Thursday, November 6th, 2008 AT 10:24 AM

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Tiny
IMPALASS
  • EXPERT
Hello Heather

Have you pulled the codes on the car at all? Go to Auto Zone or O'Reilly's and for free they can pull the codes to the car. Most important. Once they check your codes, if they find something and you don't get it fixed and need to get back with us, please make sure you tell us exactly what the code was, number and all. Example, if the code was E0568 O2 Sensor bad. Then make sure you give us all of that. While there for free also they can bring their tester out and check your battery, alternator and starter.

Next, based off of what you say, you may have fuel injectors bleeding down. You would have to put a pressure gauge, turn the car off and see if the pressure bleeds down.

Also, most important, you may have a recall on the fuel pump. If you would provide me the specific on your vehicle, is it a 1500 or 2500 and I need the specific engine Liter size and type and the 8th digit of your VIN number.
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Friday, November 7th, 2008 AT 4:35 PM
Tiny
HEATHERH1999
  • MEMBER
The Suburban is a 1500, 5.7 liter vortec, and the 8th number in the VIN is an "R"

Thanks for taking the time to give me some advice.
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Friday, November 7th, 2008 AT 7:33 PM
Tiny
IMPALASS
  • EXPERT
Hello -- Heather

The good news is it doesn't look like the recall is for your vehicle. I attached just the top part.

As for your problem....I attached the operation of the fuel system. I think you have injector bleed down. Maybe they are worn out....you do have some good healthy miles on it. To replace them that is about $400 I think just in some parts.

When the key is turned ON with out the engine running, the control module turns a fuel pump relay ON for two seconds. This builds up fuel pressure quickly. If the engine is not started within two seconds, the control module shuts the fuel pump OFF and waits until the engine starts. As soon as the engine is cranked, the control module turns the relay ON and runs the fuel pump. When the engine is cranking or running, the control module receives the Crankshaft Position (CKP) sensor reference pulses which in turn energize the fuel injectors.

You could replace the fuel relay which is about $15.00 and run a can of BG-44K injector cleaner through the engine. I say the relay only because if it is acting up and not coming on correctly you only have 2 seconds then the fuel pump shuts off. The BG will clean the injectors.

Fuel relay location


http://www.2carpros.com/forum/automotive_pictures/248015_1_37.jpg



The only other thing is maybe the Crankshaft sensor. There was a TSB back in 2000 that caused a no start due to bad sensors. You could replace that if you wanted but it they are bad they usually throw a code.

Have you ran by the Zone or O'Reilly's yet for the codes, battery etc yet?

I hate playing let's replace parts since we don't know the exact problem but I am also trying to give you advice on saving the most expensive until last.

Now if that doesn't fix it then you will need to have the injectors tested for bleed down.

I hope this helps.

Recall that doesn't apply to you

MAKE / MODELS: MODEL/BUILD YEARS:

Chevrolet/Suburban 2000-2001

GMC/Yukon XL 2000-2001

MANUFACTURER: General Motors Corp.

NHTSA CAMPAIGN ID NUMBER: 05V155000 RECALL DATE: April 14, 2005

COMPONENT: Fuel System, Gasoline: Delivery: Fuel Pump

POTENTIAL NUMBER OF UNITS AFFECTED: 316508

Technical Service Bulletin on Crank Sensor

Engine - No/Hard/Slow Start/Backfire/Kickback
Notes

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 00-06-04-014

Date: April, 2000

TECHNICAL

Subject:
No, Hard, or Slow Start, Backfire or "Kickback" During
Crank/Start, "Grinding" or Unusual Noises During Crank, DTC P0338
(Replace Crankshaft Position Sensor)
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Friday, November 7th, 2008 AT 8:22 PM

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