My engine makes a sort of light knoking sound It is not coming from the bottom of the engine, it's coming from the top of the engine towards the rear. It doesn't sound like a lifter so what else could it be? The car still has good power and the oil pressure is good its at 65 psi at full throttle and 30 psi at idle. the engine has 158,000 miles on it.
2007-04-18 14:56:05 · 7 answers · asked by CAPTAIN GENIUS !! 5 in Cars & Transportation ➔ Maintenance & Repairs
Its a 3.1L V6 if that means anything.
2007-04-18 15:09:49 · update #1
the slight knocking that you hear is common in the 3.1's i have owned 3 cars with the same engine and they have all made that same sound. don't worry about it. it's a great strong engine.
2007-04-18 15:18:15 · answer #1 · answered by Anonymous · 0⤊ 0⤋
If it is a pronounced and steady knock, that changes with engine rpm, it may be a piston wrist pin knock. Lifters have a higher pitch "tapping" sound, but a knock in the upper end of the engine could very well be a wrist pin...
2007-04-18 15:05:48 · answer #2 · answered by Michael B 6 · 0⤊ 0⤋
properly if its the three.a million V-6 then its prob the intake manifold gasket leak. its leaking coolant in on your oil and arising sludge on your engine. an straight forward frequently happening component. so suitable way is to open your oil cap and seem interior the hollow to make certain in case you spot sludge. or pull the valve conceal to get a good seem. yet thats what it feels like. pull your dip stick out and smell the oil on the stick. if it smells like engine coolaint. then thats what that's a coolaint leak. do a google seek on your engine and contain sludge and you will see a ton of court docket situations.
2016-12-29 08:32:35 · answer #3 · answered by lodge 3 · 0⤊ 0⤋
The cam is probably getting tired, but she still probably has some life to her.
Try some oil treatment, there's all kinds of them out there that may help.
Hope this helped, good luck!
2007-04-18 15:06:13 · answer #4 · answered by Anonymous · 0⤊ 0⤋
It's called "detonation".
Use the next higher grade of gas. 89 octane instead of 87.
2007-04-18 15:04:12 · answer #5 · answered by Mr. KnowItAll 7 · 0⤊ 2⤋
it could be a rocker,come loose.take off the valve pans and see if the rockers are all tight.
2007-04-18 17:34:31 · answer #6 · answered by Anonymous · 0⤊ 1⤋
when in doubt contact GMC
2007-04-18 20:37:15 · answer #7 · answered by smokey 7 · 0⤊ 1⤋