1994 vr commodore executive knock in motor.
just bought a 1994 vr commodore executive when u start it up has a real metallic knock to it how ever when u rev it or the engine is showin high revs its dissapears. a mate of mine said it could be lifters, im hopin its not bearings. while its idling u hear the metallic knock. whats your opinion. what are symptoms of bearing damage and lifter damage. if big end bearings etc are stuffed will it blow smoke form exhaust etc. this is my first commodore. Thanks for nay advice or feedback
Banned
Could very well be a bearing mate.
Perhaps low oil pressure too?
Check the pressure, you might be able to save it by replacing the oil pump.
ok i thought maybe lifters since noise isnt there all the time only when its idling. once u rev it or its underload as it dissapears
Id get the oil pressure tested to see if its within spec..
ok kewl ill get that done im hopin its not bearings. but someone told me if its bearings the noise would be there all the time. has only done 213000
Banned
It'll be the bearing knocking, but whether its knocking because its rooted or because the oil pump is giving up is the question.
If it improves with RPM good chance its the pump.
if thats the case will it be ok to drive its just noisy on idle but then dissapears as the rpm increased or u rev it.
Banned
It sounds like the oil pump isnt pumping the oil fast enough,but once the oil has covered all the components the noise stops.Get the pump checked but in the mean time use a heavy duty oil
is the pump located inside motor as i only bought this car yesterday and takin it in monday for a rwc. so i can register it.
on holiday
pump is part of the front timing cover and will very rarely cause any issues I.E never LOL. the pick up in the sump can become clogged with gasket goo and other foreign debris causeing low oil pressure.so many things can make a knock noise it could be anything does the noise get faster with revs
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
Banned
Nah don't drive it till you sort it.
nah mate no noise when u drive only at idle once the revs go up its good.
Originally Posted by delcowizzid
Banned
pull the injector plugs off one by one untill it stops knocking at idle
if it doesn't stop its not a bearing.
Banned
If it is blowing smoke then it could be the piston and rings,the tapping noise would be the lifters,it sounds like the motor is worn out,how many k's are on it?
213000 km, no the vehicle is not blowin any smoke at all. its just a loud knock on engine start and idle, once u rev it and get the revs up it dissapears. few close friends of mine have said lifters as the noise dissapears with revs. always serviced and maintained by a old lady, one owner vehicle since new, always garaged
Banned
I had the same noise on one of my cars and I just let it go,then one day as I was driving the noise got worse and louder.I then took it to my mechanic he took the covers off it and found one of the lifters had bent,what it looked like was one of those drinking straws that you can bend.He replaced the damaged lifter and the noise was no longer there.
Banned
Try the injector trick and you'll know for sure.
sweet with the injector take them out one by one. do u put the one u pull out straight back in. tehn do th enext and so forth. what will this proove by doing this?
Banned
It'll remove some force off the piston, if its a dead bearing it wont knock any more.
Yes you put them back on after you test it. You don't pull it out, you just take the electrical connector off.
yeah mate that is what i was told baout my VR? did u have nay signs or symptoms to the lead up and did the noise dissapear when u reved it and the rpms went up? its a metallic sound very loud. did ur car stop when the lifter stuffed up copmpletely. im really shoit scared not knowin what to do i am really hopin its not a bearing.
Banned
The car made it to the mechanics but I had to drive it slowly and it sounded like a vw beetle it felt like it was running on 1 cylinder.
Banned
sounds like balance shaft bearings.
im goin with the idea of harmoic balncer even tho the old owners told me they not long replaced it. they said they were sellin the vr cheap as they couldnt be bothered to spend money on the engine knock. im ruling big end bearing out as what i have read on the forum, cause the noise dissapears when u rev it, only at idle u hear this knock. im guessing harmonic balancer.
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