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1999 Chevrolet Blazer help please!

Tiny
SHANE32WEAVER
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 193,000 MILES
My 1999 blazer will only start if I pour gas into the throttle body. It runs fine after that unless I give it a lot of gas, then it hesitates real bad. Had the fuel pressure checked not too long ago & was told it was good. I have to pour gas in the throttle body every time to get it running. Can you help me please? It's too good of a truck to let go for this reason.
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Tuesday, April 1st, 2014 AT 4:14 PM

3 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
There's two common things to look at. First of all, depending on the type of fuel injection system you have, some GM engines won't start if the fuel pressure is as little as two pounds low. At roughly 50 pounds, that's not much leeway. My vehicles run around 50 pounds and will run fine down to as low as 20 psi. That is common and makes it hard to believe that two pounds can make that much trouble on some GM engines.

The next thing to consider is if the intake air temperature sensor is reading correctly. If it's reading a higher temperature than it should, you won't get enough fuel for starting.
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Tuesday, April 1st, 2014 AT 5:50 PM
Tiny
SHANE32WEAVER
  • MEMBER
  • 2 POSTS
Very helpful. I'll check those 2 things tomorrow. Thank you sir!
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Tuesday, April 1st, 2014 AT 6:24 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
Hahahahaha. I'm not a "sir"! That was my father.

Holler back with the solution if you find it.
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Wednesday, April 2nd, 2014 AT 4:47 PM

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