Loud Lifter Knock/Missing coolant/Intake Manifold Gasket

I'd run the truck to warm the oil. Then drain the old stuff out. Then add the cheap oil + oil flush and the cheap throw away filter. Then run the engine for the recommended time. Then drain the oil again and replace the oil with good stuff and a good oil filter (k&N makes an oil filter).

FYI, when you look at the oil flush crap, all they are is lighter weight organic liquids. This will thin out your oil a bit and free up crud that forms internally.

is there an echo here?

well, i have a 95 gmc jimmy, that has had buckoos of mechanics look at it, and have put alot of money it...anybody know what would make the truck idle badly...even though after it's run awhile...it seems to be fine? also...there is an overpowering gas fume the whole time it's running...and black watery soot comes from the tailpipe...it has no scent...but literally will coat the ground instantly upon a cold start-up...sorry about my lack of knowledge...i'm a nursing student...who has time for mechanics class too? lol...Kelly

Hopefully you have the problem fixed now but if not I have worked on quite a few of these and the most common problem is the injector and/or the supply lines in the intake. From what you describe and reading your other replys that would be my guess. And those other "mechanics" would know were the fuel smell is coming from if they had any clue. If the injector or supply lines were bad the car would run rich and not idle well and would very likely have a fuel smell. The reason why the engine would run rich if the supply lines were bad is because they are inside the intake. To find out if your injector is bad take the vehicle to a shop and have a fuel pressure test done. The fuel pressure with the engine not running should hold between 50-55psi. If the pressure comes up then drops right away the regulator is bad or one of the fuel lines has a hole in it. The injector can not be rebuilt and it has to be replaced as a unit and cost around $250. The supply lines cost $70 and are only avlable at the dealer. Hope this helps.
Daley
P.S. you should only pay 20-$40 to have the test done, it takes all of 2 minutes

Hopefully you have the problem fixed now but if not I have worked on quite a few of these and the most common problem is the injector and/or the supply lines in the intake. From what you describe and reading your other replys that would be my guess. And those other "mechanics" would know were the fuel smell is coming from if they had any clue. If the injector or supply lines were bad the car would run rich and not idle well and would very likely have a fuel smell. The reason why the engine would run rich if the supply lines were bad is because they are inside the intake. To find out if your injector is bad take the vehicle to a shop and have a fuel pressure test done. The fuel pressure with the engine not running should hold between 50-55psi. If the pressure comes up then drops right away the regulator is bad or one of the fuel lines has a hole in it. The injector can not be rebuilt and it has to be replaced as a unit and cost around $250. The supply lines cost $70 and are only avlable at the dealer. Hope this helps.
Daley
P.S. you should only pay 20-$40 to have the test done, it takes all of 2 minutes

1) Welcome to the forum. :smile:

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3) Why spend $40 to have the fuel pressure tested, when you can buy a gauge for $40, and never have to pay someone to test it again?

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