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Old 02-10-2009, 07:23 PM
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Default 6.0L LQ4 Fuel injection

Okay fuel injection guys I have a question. I have a 99 silverado with a 6.0L factory engine. It has problems starting. The engine sounds like it is starting so I let off the ignition and it dies. Some times it will start and run fine, then I shut it off and try it again and it won't start. The check engine light never comes on at any time. I have checked the fuel regulator on the fuel rail and cleaned around the throttle body with carb cleaner. Does anyone have any ideas?
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Old 02-10-2009, 07:36 PM
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fuel pressure test? spray some carb cleaner in t-body to see if it starts- if i had to guess- fuel pump- pressure drop will cause hard - no start especially cold- if it is put an A/C Delco pump in it- not aftermarket- my 2 cents- Chris
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Old 02-10-2009, 07:39 PM
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when I take the intake ductwork off of the throttle body the engine dies, is this normal?
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Old 02-10-2009, 07:43 PM
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Quote:
Originally Posted by bowtie_nut View Post
when I take the intake ductwork off of the throttle body the engine dies, is this normal?
cant do that- has to run through maf sensor to stay running- i thought it wouldnt start??
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Old 02-10-2009, 07:45 PM
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it will start every once and a while. Once it is running it runs fine. It is just a matter of getting it to start

Last edited by bowtie_nut; 02-10-2009 at 07:49 PM.
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Old 02-10-2009, 07:50 PM
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how old is the fuel filter?? sounds like the pump is weak- hard to start cold??
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Old 02-10-2009, 07:54 PM
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filter has around 5 years on it and the pump was replaced last summer.
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Old 02-10-2009, 07:58 PM
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yep start with the filter (plugged) - it should be replaced more often- check the fuel pressure- there should be a shrader valve on the fuel lines- i can look tomorrow for specs at work or google it - maybe someone can chime in here- but i think it should be all of 50psi- good luck- Chris
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Old 02-10-2009, 08:00 PM
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thanks for the help
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Old 02-11-2009, 07:56 AM
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fuel pressure on any LSx engine which includes the iron truck engines should be 58psi at all times. The engine should crank and run with 50 psi but there's a problem if you've only got 50 psi
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