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97 Chevrolet Tahoe LT 5.7L 4x4 hard to start when hot or

Customer Question
warm but starts fine when...
97 Chevrolet Tahoe LT 5.7L 4x4 hard to start when hot or warm but starts fine when cold.
Submitted: 1 year ago.Category: Chevy
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Answered in 3 hours by:
11/23/2016
Chevy Mechanic: Dan, Technician replied 1 year ago
Dan
Dan, Technician
Category: Chevy
Satisfied Customers: 24,965
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Chevy Mechanic: Dan, Technician replied 1 year ago

Have you done any testing or has anything been replaced yet? Thanks.

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Customer reply replied 1 year ago
I have replaced crank sensor, the coolant sensor, I put AC delco spark plugs in. Replaced the distributor cap and rotor. I have replaced the spark plug wires.
Customer reply replied 1 year ago
no CEL
Chevy Mechanic: Dan, Technician replied 1 year ago

Based on symptom alone it sounds like a problem with fuel pump. Check fuel pressure next time it doesn't start and compare to when it does start. If fuel pressure is lower during no start then replace the pump. Let me know if you have more questions or if there is anything else I can do to help. Thanks.

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Customer reply replied 1 year ago
Well I mean would it be a fuel pump if it starts fine when it's cold? It only hesitates when it's warmed up and hot
Chevy Mechanic: Dan, Technician replied 1 year ago

Yes, when fuel pumps first start to fail they usually work fine when cold then act up when warm. Let me know how it goes or if you have more questions, thanks.

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Customer reply replied 1 year ago
Ok will do
Chevy Mechanic: Dan, Technician replied 1 year ago

Sounds good, keep me updated. Thanks.

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