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2002 gmc sierra fuel in engine oil. Starts fine runs rough.

Customer Question
2002 gmc sierra fuel...

2002 gmc sierra fuel in engine oil

Mechanic's Assistant: Has the vehicle turned into a gas hog? And how does it start -- same as usual?

Starts fine runs rough

Mechanic's Assistant: Are you fixing your Sierra yourself? What have you tried so far?

Fixing myself acft mech for 40 years, replaced injectors

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Started knocking then noticed fuel in oil

Submitted: 3 months ago.Category: GMC
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Answered in 38 minutes by:
3/18/2018
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 3 months ago
david craig
david craig, Owner/[email protected] 3D Atuomotive
Category: GMC
Satisfied Customers: 5,605
Experience: owner/mechanic at 3D Automotive
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Hi my name is ***** ***** I'll be more than happy to assist you, Please allow me a few minutes to review your information. Thank you.

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GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 3 months ago

diesel?

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Customer reply replied 3 months ago
No, gas.
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 3 months ago

you have fuel in oil on a gasoline engine? wow. it's very common for a diesel but not for a gasoline engine. please standby

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GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 3 months ago

what size engine?

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Customer reply replied 3 months ago
5.3 Vortec, one mech thought computer was telling injectors to keep dumping fuel in.
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 3 months ago

could be but Im looking at other possibilites

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Customer reply replied 3 months ago
When I drained the oil, I got about 10 or more qts instead of 6.
Customer reply replied 3 months ago
About 5 of it seemed to be fuel.
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 3 months ago

have you done a fuel pressure leak down test?

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Customer reply replied 3 months ago
No, not sure how. I can check the manual.
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 3 months ago

its a regular fuel pressure test then you turn the key off and see how long it take the pressure to bleed down

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Customer reply replied 3 months ago
the problem would be too high pressure forcing fuel into cyls?
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 3 months ago

well if the pressure is too high, yes, but what I'm looking for is a rapid drop in pressure

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Customer reply replied 3 months ago
If there is a leak, where would it be and how would it get in the cyls?
Customer reply replied 3 months ago
I will do this test as soon as I can.
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 3 months ago

the leak would be through the injectors, but you have replaced them, so that's out of the question. too high of a pressure be the issue, but if the injectors aren't pulsing correctly that could be the issue also. get a noid light and check injector pulse

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Customer reply replied 3 months ago
Ill do the pressure test and get the noid lite as soon as I can. Tks.
GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 3 months ago

ok, and let me know

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GMC Mechanic: david craig, Owner/[email protected] 3D Atuomotive replied 3 months ago

hows it going?

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