How do I fix random misfiring

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June 27th, 2024, 10:57 AM

#41

quartercenturytruckin

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Quote:

Originally Posted by mountainmanjoe

well don't feel bad. without diagnosis, the chances of fixing a problem by throwing darts at the parts dartboard are pretty slim. You could have just as easily been wrong, and still be replacing half the sensors on the engine.

Well...... something is wrong.

Fuel trims are back up and now I have the fun of a starting issue. I crank the engine and It tries for however long I have the key turned but will not start up unless I turn the key to off and crank it a second time.

This happens even when I have pressure in the fuel rail prior to attempting to start.

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June 27th, 2024, 1:25 PM

#42

mountainmanjoe

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https://charm.li/Chevy%20Truck/1999/...s%20Not%20Run/

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quartercenturytruckin (June 27th, 2024)

June 28th, 2024, 6:06 AM

#43

chem_man

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Check and make sure the EVAP system is operating properly.

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June 28th, 2024, 6:35 AM

#44

quartercenturytruckin

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Quote:

Originally Posted by chem_man

Check and make sure the EVAP system is operating properly.

Checked the EGR valve this morning and all looks well. I put the old spark plugs back in and the hard start is gone. Fuel trims are still high. I'm gonna check the O2 sensors and Cat today. I know the downstreams are reading high right now.

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