Will turn over but will not run

Tiny
APRIL043
  • MEMBER
  • 1999 GMC JIMMY
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 118,000 MILES
We've replaced the fuel pump, the plugs, the wires, alternator, etc. It will not run why is that?
Monday, November 25th, 2019 AT 8:45 PM

1 Reply

Tiny
JONNYB1963
  • MECHANIC
  • 252 POSTS
Good Morning April,

To Answer that question we need to understand the full picture here.
For an engine to run it needs to have 4 basic things. Air, compression, fuel and spark.

It sounds to me like you have a good battery as you are able to crank so the battery, alternator and charging system are not of concern at this time.

What we need to find out what you are not getting in order to make the engine run.

Please see this guide to help you get started (no pun intended):

https://www.2carpros.com/articles/car-cranks-but-wont-start

Also can you answer me this question. Remembering how the engine used to sound when you would normally start it.. does the cranking sound funny as if the engine is spinning faster than normal?

Jon
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Tuesday, November 26th, 2019 AT 6:33 AM

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