i bought a 94 GMC with a 6.5 turbo in it in October and only drive it every now and then, mainly for my hunting truck. My question is, a few days ago, it started making a noise and i'm trying to figure out what it is or if I should sell the truck before I dump more money in it. The noise to me sounds like its coming from the pulley under the a/c pulley. What is that? Is that the oil pump or something. Its making sorta like a knocking or loud ticking noise then every once and a while it will squeal. any advice will be apriciated. it has 186,000 on it. I think the owner before me didn't care too much about the truck and didnt take the best care of it but I got it for 1900 and everything but that has been working ok other than the starter and i fixed that.

 

under the a/c pulley would be the vucuum pump

what kind noise it making they will make some noise

 

Its almost like a ticking noise to a thumping noise and every once and a while it will squeal. are those expensive and hard to change??????

 

i did way with mind so it maybe still hanging around and it still good i have look tomorrow see if still have

but i would first pull the belt off and spin pulley buy hand and make sure what pulley bad

 

thank you very much i appriciate all your help

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What do you mean you did away with yours, do you not need it or did you put a different kind on???

 

i put in TM on

Sorry i look this morning for the vacuum pump must have junk it

 

TM ??? What is that

 

turbo master



where your truck is 94 1500 you still going to need vacuum pump to run the EGR or you want gut your intake or fine F intake then you can do away with the vacuum pump

 

oh should also tell you if you run TM you need to run boost and EGT gauges

 

Wow, sounds like I would be getting way in over my head.

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Is there anyway to check the vacuum pump before i replace it, could it be the belt making it squeal? I don't want to replace the pump and then it be just the belt.