It cranks and cranks takes a while to start but when it starts it runs Super good?

Tiny
ANONYMOUS
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • 120,000 MILES
Sometimes does not want to start in the morning, it cranks and cranks takes a while to start but when it starts it runs super good. I checked the fuel pressure it goes to 60lbs. Right away. Once you are cranking it goes to 40lbs.
Thursday, March 28th, 2013 AT 5:21 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

You could have an issue with the crankshaft position sensor.
As the crank sensor starts to go bad, many times you will have to crank the engine over and over before it will start.
Over time due to heat and vibrations the crank sensor will loose its internal calibration and start to give you intermittent issue. Ultimately it could fail all together and not start the engine at all.
This vehicle also has a crankshaft reluctor wheel which goes on the crankshaft. This can trigger a similar issue as well.
Here are some helpful articles:

https://www.2carpros.com/articles/car-cranks-but-wont-start
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

I have attached diagrams for your reference.

Please let me know of any questions.

Thank you.
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Sunday, August 15th, 2021 AT 12:33 PM

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