Question about 1991 GMC Sonoma

1 Answer

Loss of oil pressure

My 1977 350cid losses it oil pressure at idle when warmed up, if you just touch the throttle it returns to 30lbs.

Posted by on

  • mayor mack Oct 18, 2008

    thanks, bearing were plastic gauged before install, all were in spec. My thinking has been bypass, missing a reducer in the line somewhere,

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,450 Answers

Main bearings are worn and when heats up they expand even more and oil can blow out these with less pressure.

Posted on Oct 17, 2008

  • TripleTauto
    TripleTauto Oct 19, 2008

    so this is a rebuilt motor? could just be a weak spring in oil pump

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Dodge v10 loss oil pressure ownly win idleing


Old engine tend to wear piston ring in time,if you use wrong viscosity grade oil ,during idling the oil could not reach all moving parts because there is no enough oil pressure in the system,try 30/ 40 oil grade .

Oct 11, 2014 | Cars & Trucks

1 Answer

What should the average oil pressure be for a


at idle and warm oil pressure should be about 15lbs pressure and at 2000 rpms about 30lbs pressure.

Sep 23, 2014 | Cars & Trucks

3 Answers

Low oil pressure reading


check that the oil level is not over the mark as this causes foaming of the oil and loss of pressure. At 80km/hr you will be doing around 3 grand and that will be enough to whip the excess oil into froth.. Too much oil is worse than too little oil.

Apr 05, 2014 | 1988 Toyota Land Cruiser

1 Answer

Loss of oil pressure


have the oil return lines been checked? May have buildup blockage and not allowing for circulation.

Jan 23, 2014 | 2007 Chevrolet Suburban Three-Quarter-Ton...

1 Answer

My 95 tahoe has an occasional ticking noise, loss of oil pressure at idle and loss of power


Prognosis is really bad, hate to tell you. Ticking comes from the valve lifters, losing lubrication due to lack of pressure and running dry. At redlights, when revs are at idle, oil pressure drops a lot, and engine really suffers. Have the vehicle taken immediately to a shop for proper diagnose and to see if engine can still be saved. The loss of power comes from the valves not actuating properly. Hydraulic lifters need oil at a decent pressure to "charge" , and if not charged, they will stay compressed, ruining valve lifting operation.

Apr 05, 2012 | 1995 Chevrolet Tahoe

1 Answer

Oil light flashes on at low idle after engine gets warmed up


if the engine is running fine and no loss of power and no noises i would suggest repplacing the oil pressure sensor,chryslers have had the same problem for years,what happens is the sensor itself starts leaking oil internally and will ebentually start coming out if the connector and that means that the sensor has been compromized,hope this helps

Oct 12, 2010 | 2002 Mitsubishi Montero Sport

1 Answer

Loss of power after and irratic idle after overheating


check your catalytic converter, and check to see if you have oil in the water or visa versa

May 13, 2010 | 1994 Honda Civic Del Sol

1 Answer

Rough idle, power loss while driving


check /replace the fuel filter and check the fuel pump pressure before and after the bleed valve to the throttle injectors

Jan 20, 2010 | 1992 Chevrolet K1500

Not finding what you are looking for?
1991 GMC Sonoma Logo

Related Topics:

206 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

61037 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...