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1999 Chevy Tahoe engine won't start

Tiny
KTRIM
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
99 Tahoe wont start. Have spark and fuel. Have good fuel psi. I was told maybe the converters, so I removed the o2's and still nothing?
Saturday, December 29th, 2007 AT 11:08 AM

8 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Will it start up if you spray staring fluid in the throttle body or hold down the gas pedal when cranking it?
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Saturday, December 29th, 2007 AT 11:22 AM
Tiny
KTRIM
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Yes tried starter fluid and small amount of gas also. No change. Removed plugs and they were wet. Left them out overnight to dry things out. Cleaned them reinstalled them pulled o2's and still won't fire. Sometimes it acts like it wants to fire for just a sec but won't.
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Saturday, December 29th, 2007 AT 11:29 AM
Tiny
BLACKOP555
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Has any recent repairs been done?
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Saturday, December 29th, 2007 AT 11:39 AM
Tiny
BLACKOP555
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Also perform a compression test and get back the results to me.
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Saturday, December 29th, 2007 AT 11:41 AM
Tiny
KTRIM
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Yes. Repairs on this truck are needed about every 6 to 8 months. Love the truck Hate it's troubles.
Had to have the fuel pump and filter changed 6 weeks ago for the second time in 2 years. The guy that installed it came over and check the psi and said it was good.
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Saturday, December 29th, 2007 AT 11:44 AM
Tiny
KTRIM
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I don't have a tester available right now. But wouldn't the compression have to be extremely bad for it not to start? Wouldn't there have been signs of trouble. It has been running fine till the other day it just wouldn't start
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Saturday, December 29th, 2007 AT 11:56 AM
Tiny
BLACKOP555
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If it has the first 2 in access the other third thing should be compression
the lowest should be no more than 25%lesss then the highest cylinder.
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Saturday, December 29th, 2007 AT 12:09 PM
Tiny
BLACKOP555
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  • 10,371 POSTS
Your spark should be bright blue and well defined, when you said the plugs were fuel soaked I didnt think much of it, but now im thinking you may be getting too much fuel.

Bleed the fuel system of all fuel and disable the fuel pump from turning on. Then crank it for a bit till there is absolutely no fuel in the lines. Then I would like you to try and crank it while having a friend spray starting fluid into the throttle body, if it fires right up you are getting too much fuel.

But if your spark isnt bright blue and well defined nothing is going to happen.

Its just a thought.

Maybe try pumping the accelerator when cranking before trying all of this.
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Saturday, December 29th, 2007 AT 12:20 PM

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