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8.1L starting problem

8.1L starting problem

Postby Tgreen1013 [OP] » Jul 30 2019, 6:45pm

I have a 2500hd 8.1 that I’m having starting issues with. Will crank and try to start but you have to mash on the gas. Sometimes it takes a few try’s other times it will start right up without touching the gas. Have replaced the crankshaft position sensor, fuel pump and fuel filter. When the truck doesn’t start and you let off the key it backfires. Any info will help. Thanks
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Re: 8.1L starting problem

Postby Rambodog » Jul 30 2019, 7:32pm

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Re: 8.1L starting problem

Postby blessedmess » Aug 03 2019, 6:59pm

I'm far from expert but have you verified your fuel pressure with a pressure tester? Will the engine start if you cycle the key to "on" 2-3 times to prime before cranking it over?
Have you checked the fuel pressure regulator... pull the vacuum line to see if dry- likely good, wet - not good
Also, Cleaning the throttle body and MAF sensor I've read are good practice for regular maintenance

I googled chevy 8.1 hard starting and found quite a few threads on this, you might do some searching and see if you find something helpful...

Good luck n let us know if you find a solution
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