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96 suburban cold start issue
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tinjet
New User
Jun 30, 2010, 5:04 PM
Post #1 of 4
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96 suburban cold start issue
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I am trying to help a friend with her 1996 Suburban with a 5.7 liter engine. The car will not start when it is completely cold (i.e. overnight) unless you give it a shot of starting fluid. Once it starts, it will continue to start fine unless it is again, completely cold. Any ideas?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 30, 2010, 6:46 PM
Post #2 of 4
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Re: 96 suburban cold start issue
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That's a typical symptom of a bad fuel pump on a Vortec engine. That's a high pressure system and it requires a minimum of 55 PSI to run and starting cold is when the problem shows first. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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tinjet
New User
Jun 30, 2010, 7:47 PM
Post #3 of 4
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Re: 96 suburban cold start issue
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Thanks for the info...is there a way to test the line pressure? I,m guessing that the the pump is in the tank and therefore a pain to replace.
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Sidom
Veteran
/ Moderator
Jun 30, 2010, 7:53 PM
Post #4 of 4
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Re: 96 suburban cold start issue
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The best way is to use a fuel pressure gauge. If you don't have a gauge you could try cycling the key from off to on about 4 or 5 times (leaving it in the on position for about 4 seconds each time), then try to start it. If it fires right up you are in the 85 to 90% range of a bad fuel pump.
(This post was edited by Sidom on Jun 30, 2010, 7:54 PM)
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