TOOK CAR OUT OTHER WEEK ON A RUN ABOUT 4/5 MILES VERY STEADY(3 THOU REVS MAX) NOTICED VIBRATION ON G/STICK ON T/OVER POPPED BONNET DEFINATE SOUND OF CRANK RUMBLE CRAWLED HOME CHECKED OIL/WATER STARTED BACK UP NOISE STILL THERE CRAWLED TO MATES HOUSE GOT THERE NOISE GONE CAR RAN FINE +QUIET JUST DONE SHEFF TO LONDON + BACK NO PROBS CAME OUT OF WORK T/DAY HAMMERED CAR HOME SAME NOISE AGAIN THEN DISSAPEARED ANY IDEAS ANYONE (sorry car is a 96 uk imprezza turbo)

 

dont hammer your car if its making funny noises would be a good start IMO

 

So you sorted how to post

come on peeps someone must have had something like this happen to them....

By the way Andy take the caps lock off when your typing m8

 

wouldnt have hammered car if noise was present but all was ok plus have another eng to go in and would rather it go pop close to home than miles away plus had to bladder a muppet in a 330ci beemer thanx for your input thou

 

gettin there pal just need to sort the smilin/frownin faces bit

 

Andy YHPM

 

onder2: You sorted yet m8

 

 

Now to find out whats up with the engine

 

Up

 

anybody any ideas before strip to investigate

 

Any difference with the clutch pedal in or out? Clutch bearings can transmit noise through to the bottom end, and make gear stick vibe.

Engine mounts? Get a pry bar in there, and really give them a good work out, check for splits in rubber.

If above is all good, i would fit an oil pressure gauge if i was you, next time it happens check to see if there is any fluctuation in pressure, oil pump could be on it's way out. An oil pressure gauge is a good thing to have in you're cockpit anyhow, and could save you ££££££££££££££.

When was you're oil last changed?

 

replaced clutch last month so no problem there oil pressure gauge is next job and going to change oil to better quality on monday then see if it appears again

 

Was the thrust bearing changed when the new clutch went in? The force of a new pressure plate on an old thrust brg could kill it in no time......just a thought!

Deffo a good plan to have a op gauge though.

 

if it was something mechanical i would have thought it would do it all the time ie bearings etc.it sounds to me like something that can alter and it lends itself to something like the electronic timing drifting retarding/advancing this can have strange effect on the engine sound...i am no expert but its one to think about powerman

 

thrust brg changed with clutch .problem is i know if crank was on way out it would go bang when on boost but it performs fine even hitting rev limiter just to kill it but it still runs ok its very anoying

 

Was thinking along them lines buit how do you find out....

 

I know what you mean, but such as an oil pump on its way out can give intermittent rumbles, ie. when under load, not delivering good pressure and starving vital parts of oil (oil starvation). Hence why i say fitting a op gauge is good insurance, and you can rule out alot of problems by monitoring the pressure when the problem occurs. If its ok then it's time to look elsewhere.

Does it still perform when you hear the rumble? Could it be that it's dropping onto 3 cylinders, that would make it sound rough as a dog. Or perhaps a coil pack intermittently tracking across onto the block, that would make your engine give a bit of a shudder as it temporarily went onto 3 then back onto 4. Does it still perform, thats the question?