The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.
Resources for the Repair and Maintenance of your 1990 Chevrolet G Series Van (G20)
1990 Chevrolet G Series Van (G20)
1990 Chevrolet G Series Van (G20) Problems
A coolant leak may develop from the water pump. This can result in an engine overheating condition. A leaking water pump will require replacement.
Our technicians recommend flushing the brake fluid every 60,000 miles. Brake fluid that is dirty may cause problems in the brake system.
The fuel pump may fail causing the engine to stall and not restart. Our technicians recommend replacing the fuel filter every 30,000 miles to help prevent undue strain on the fuel pump.
An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.
1990 Chevrolet G Series Van (G20) Recalls (Recent)
Summary: SEAT BACK OF THE REAR BENCH SEAT MAY BREAK AWAY FROM THE SEAT CUSHION IN AN ACCIDENT.Learn more »
1990 Chevrolet G Series Van (G20) Questions and Answers
My Air Conditioner is not blowing Cold Air. This is actually a 1989 g20 chevy conversion van. It blows hot air out of the vents when i cut it on with no funny noises. The van only has 65 thousand ...
I need to know the Head Bolt Sequence and Ft lbs for the 350 engine?
The van will turn over and speed up a little as if it will start and sometimes give a rough, rough idle for 4-5 seconds, but will not start, and sometimes will backfire out of the air intake. 2 we...
Code-15: Replaced coolant sensor-checked wiring to computer-swapped computer with spare--checked grounds-nothing seems to help--rich starting-pull the plug on coolant sensor and motor will begin to...
1990 Chevrolet G Series Van (G20) Reviews
I had the same issue as with the idle, turned out to be a combination of a bad EGR valve and I replaces the pick up coil in the distrbutor for 22.00, just knocked out the dist. gear pin with a punch and hammer, put the new one on and it purred like a G20 kitten. Before you do that though check your fuel pressure to be between 9-13 if its lower that may be the prob.
I had the same thing happen on our 1991 g20. Found a fuse for the fuel pump was all it was!
Hope this helps!
i have a 1990 chevy g20 van and since iv had it i took it for a test drive the first day i have had it and only went about a mile and a half from home and started going up hill is when i had lost power and costed to the side of the road and would start it had sounded like i was out of gas>when i had finally made it home finally after getting it towed i had a mechanic come out and look at it and so far i have replaced the fuel pump and the distributor cap and rotor and the modual all it does it cranks but wont start and i have to keep spraying starter fluid in for it to start and even when i do that it wont stay running itll run for about thirty seconds then shut off could any body help me to figure out what the problem is or what it could be i had gotten the van for my family as it has grown to be pretty big and we have yet not gotten to use it and the only other vehicle we have is a small single size truck PLEASE HELP