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Originally Posted by savage8190
Hi everyone. I have a 1990 gmc jimmy sittin in my garage and Im a little tired of seein it not move. It has a 4.3l tbi engine which i recently swapped into it. The thing runs pretty good but I have come across three problems that just boggle the mind.
1) I have a mysterious coolant theif running loose. I lose coolant pretty fast from the reserve, but not quite as fast from the rad it seems, and there is not a leak to be found. Theres no coolant in the oil, no smoke from the pipe, and no drips on the ground. Hmmmm...
2) It idles fast. It doesnt idle too too fast, it sits at about 1250. But that is about 500 too high. Seems to be fine in gear, and it even drops a bit sometimes if i drop it from park to drive then back to park, but only sometimes, and the drop is very little. I have no vac leaks, ive replaced the tbi gaskets, most sensors are new, and theres no bad wiring. The only abnormality i could find is that the iac is staying extended (not letting air in). I tried replacing it but the new one did the same thing.
3)And the final problem is a weird one. The vehicle has been sitting for about 8 months, and when I took it out for a little spin this problem appeared. There is a grinding noise(like a muffler dragging on pavement) coming from the rear end. Obviously I looked and there's nothing dragging, so I found this noise odd.
If someone could please, PLEASE help me it would me much appreciated. Im a student and I really cant afford to take this thing into the shop for diagnoses AGAIN, (thats right ive had two mechanics look at it and they couldnt tell me squat, although one was my drunk uncle and the other was a canadian tire flunkie) but ive gotta get this thing workin properly ASAP.
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Ok, the coolant problem. How much goes missing over what time frame?
1250 for idle is really high, it should be around the 500-700 range. I would check for a vacuum leak somewhere. Check all the vacuum hoses and also check the engine timing with the timing wire disconnected. Advanced timing will cause the engine to have a higher than normal idle also.
The grinding noise could be a muffler which is worn out and the interior of it is loose. Also could be the cat. Get under both of them and smack them with the flat palm of your hand and listen for rattling.
Oh, and Crappy tire, don't get me started on those rip off assholes, I don't trust them to do anything. I go in for a tire rotation and they are telling me my brand new shocks are blown. They were 3 days old.
Boy did I ever rip them a new asshole over that one.