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Start engine oil pressure comes up then begins to drop about
start engine oil pressure comes up then begins to drop about 8# ***** sequence down to almost 0 … read more
Gm Tech (Cam)
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Vocational, Technical or Trade Scho
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2006 Envoy Denali 5.3 Engine, 150K miles. Oil changed every
2006 Envoy Denali 5.3 Engine, 150K miles. Oil changed every 3,000 miles with Mobil 1 5W30 synthetic since new from factory. Been having slight engine tapping noise, low oil pressure 0 to 20 at idle, 1… read more
Tyler Henry
Tyler Henry
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I would like the installation procedure for an engine oil
I would like the installation procedure for an engine oil pump 2017 6.2L gmc Denail crewcab… read more
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I need detailed instructions for the removal and replacement
I need detailed instructions for the removal and replacement of the timing chain cover gasket on a '92 GMC Vandura.… read more
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We just got done doing an engine rebuild due to oil pump
We just got done doing an engine rebuild due to oil pump failure. Now with refreshe engine i am still getting low oil alarm when stopped at a light after engine has been running for 30 min on the high… read more
kalamykid
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Why would the oil pressure drop to zero when you accelerate
why would the oil pressure drop to zero when you accelerate but at idle and when you are driving at a constant speed it is fine?… read more
Gary
Gary
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I have a 2002 gmc envoy 4.2***** and I am replacing
I have a 2002 gmc envoy 4.2***** and I am replacing the timing chain cover. I have separated it from the engine without droping the oil pan which was told I can do, but I cant pull it off because ther… read more
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GMC Yukon SLE: Hi Eric, I have a 2002 GMC Yukon SL 2wd with
Hi Eric, I have a 2002 GMC Yukon SL 2wd with 205K. The dealer replaced the oil pan gasket about 3-4K miles ago and a couple days later my motor began tapping from the bottom of the engine behind the d… read more
Eric
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GMC 1500 Denali: I have a 2002 Denali Pickup. My daughter
I have a 2002 Denali Pickup. My daughter was driving it and stated that the steering wheel was hard to move but the engine was still running. Turned off the motor and it would not start. We could not … read more
Gary
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GMC Yukon XL 1500 Denali: 2005 GMC Denali XL AWD 190K Miles
2005 GMC Denali XL AWD 190K Miles been a great vehicle Recently my oil pump seems to loose prime, when it has been sitting more than an hour I have to tap gas to get oil pressure to bounce up, then it… read more
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I have GMC T7500 with a 7.8 liter isuzu engine. It has
I have GMC T7500 with a 7.8 liter isuzu engine. It has started running at 80+psi oil pressure. What would cause this and how can I fix it? If it is a pressure relief valve then where is it located?… read more
tripletauto
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GMC: I have an oil pressure problem with my companys 2004
I have an oil pressure problem with my company's 2004 GMC Topkick, Duramax LLY, 456,600 miles. At a cold-soaked start-up (45F) oil pressure was 78psi. After warm-up to 180F coolant temp, idle pressure… read more
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GMC 1500 sierra: 2005 gmc 1500 sierra 6.0L vortec steel block
2005 gmc 1500 sierra 6.0L vortec steel block with aluminium head. I,ve had low oil pressure upon start up below 20 for about 6 month then after driving the normal operating pressure is 40. the lag tim… read more
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GMC Yukon Denali: I replaced the oil sending unit in my GMC
I replaced the oil sending unit in my GMC 6.0 and the gauge doesn't fluctuate at idle nearly as much as it did before. However just as before, sometimes at idle (500 rpm) it will have 30+ psi and some… read more
tripletauto
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GMC Yukon 4x4: 2001 GMC 5.3l with 200k. Starts fine oil pressure
2001 GMC 5.3l with 200k. Starts fine oil pressure goes to 40 but at cold idle gauge fluctuates and then drops to zero... The lifters start clacking and the oil light comes on. Before you say "put a me… read more
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GMC Envoy Denali: 2005 envoy Denali. 5.3l M code motor. Having
2005 envoy Denali. 5.3l M code motor. Having to replace cam & lifters. Vehicle is 4x4. Appears front diff runs through oil pan. Would like to replace oil pump & timing chain while front is uncovered. … read more
goodwrench9124
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GMC Savana 1500: 1999 GMC Savannah Van with 5.7L. It has no
1999 GMC Savannah Van with 5.7L. It has no oil pressure at idle and less that 20psi at 2000 rpm. Changed oil pump with high volume pump. No change. Other than the engine being worn out is there any ot… read more
Dave Nova
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GM avalanche: 2005 avalanche vortec. 5.3, began making ticking
2005 avalanche vortec. 5.3, began making ticking noise 2 weeks ago, removed belts to eliminate pulleys and driven accessories. did not go away. sounds like front lower engine behind harmonic balancer.… read more
Gm Tech (Cam)
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Vocational, Technical or Trade Scho
1,912 satisfied customers
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Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,912 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,589 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

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JFN1

ASE Certified Technician

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Don - Mo Lurch

Don - Mo Lurch

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GM, GMC, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics

Mike S.

Mike S.

ASE Certified Technician

241 satisfied customers

GMC N.A.I.S.E. Certified Auto-Mechanic

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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