engine knock on 1999 GMC Jimmy

i was driving today and the vehicle overheated. i checked the engine oil and it was 3 quarts low! had a problem similiar to this one about a month ago with the same vehicle. i took it to the shop and the mechanic told me that my spark plugs were not proper for this vehicle and of course the engine oil was low at the time too. he replaced the intake manifiold, changed the spark plugs. he also said my engine oil was contaminated with dex-coolant? i am getting very frustrated with this vehicle. it's old but it has only 126,000 miles on it.

by in Page, AZ on June 26, 2011
1 answer
ANSWER by on June 26, 2011
If you have oil in the coolant, or coolant in the oil, then you have internal engine problems which need diagnosis, or if it's really transmission oil in the coolant, then it's due to an internal leak in the radiator, where the trans fluid circulates for cooling. If you want to find a GM specialist, here's our directory link for you: https://repairpal.com/directory?address=86040&car_brand_names=GMC
Related Items:
Service engine soon light is on. Car starts fine and I can reverse. Once I go to avcelerate, the Jimmy crawls. It'll crawl at 10, 20 mph and slowly kick into gear. It "bucks" when it kicks into gea...
Hey guys, i just replaced my clutch, slave, and had my flywheel turned. Bolted everything back...
My car was knocking so i found a rocker arm loose on cylinder 6. The nut was tight to spec 18ft.lb, i tried tightening to 20ft.lb and did not change anything. I put a washer between rocker ball a...
Replacement part BWD esc104. generates error 43 when it fails. manages the spark advance. Mine is jumping all over the place and set error code 43 and then turns on the service engine light. re...