Cranks but wont start?

Tiny
RICKYBOBBY8902
  • MEMBER
  • 1997 CHEVROLET SILVERADO
  • 100,221 MILES
Have a 97 Chevy Silverado pickup 4.3 lit. Truck cranks but wont start, gas fouls the plug. It has spark, seems to want to start. Truck acts like it wants to start when turning key back off. It gets fuel and fire. Can some one help me please, whats my possibility? Gas fouls out the plugs. Have replaced plugs and wires
Friday, December 23rd, 2011 AT 12:57 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

If you are getting spark and fuel but no start, it could be a issue with low compression. It can also be a faulty crank sensor.

Check your compression. You can use a compression checking tool.
Usually you can get one from your local auto parts store to use.
General rule on a compression is the minimum compression in any one cylinder should not be less than 70 percent of the highest cylinder.
You should not have any cylinder less than 100 PSI

Here are few helpful articles on how to check compression and typical symptoms of having low compression:

https://www.2carpros.com/articles/how-to-test-engine-compression
https://www.2carpros.com/articles/the-reasons-for-low-compression
https://www.2carpros.com/articles/symptoms-of-low-compression

Also check your crank position sensor. It is located on the lower right side of the engine.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

I have attached diagrams for your reference.

Please let me know if you have any questions.

Thank you.
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Sunday, August 8th, 2021 AT 2:36 PM

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