Przekop20

So I just got my car back together and it is starting to me a very unconstant rock pebble noise sounds like little rock or something is bouncing around in the motor. the noise only starts to happen after the car is fully warm

First the car starts to idle surge and then make the noise.

At first we thought it was the head but we had a shop check out the head and everything was fine.

The weird part is if we hold the throttle at basically anything higher then idle the noise goes away.

My last guess is it has to something with the oil like the motor is getting enough and im having metal on metal contact some where making the noise.

my oil pressure is reading around 25-35 at idle. so there is pressure there


if anyone has run into this problem or thinks they know whats going on please help!!!

popwars123

iTrader: (1)

Does the engine have forged pistons? It could be piston slap.

Przekop20

Yeah it has cp 9.1 and eagle rods acl bearings

but when we pulled the head there was no marks of piston slap

and when we hold the motor at a higher rpm then idle the noise goes away wouldn't that make a louder slap?

carlos8

commonly sounds caused by vibration in idle disappear when hold the throttle at higher RPM's. Maybe this is your case!! Check for possible vibration sources. i.e. Dumptube, exhaust piping or something real close that make noise when vibrate.

A fully warmed b series at idle 25-35 oil psi is normal.

If you where having issues with low oil and metal friction believe me your engine will not still running.

wantboost

iTrader: (2)

could be the start of rod knock, a motor will still run with spun bearings

Przekop20

Bearings looked good and everything in the whole motor is new never seen and miles yet

Muckman

iTrader: (2)

Its a rattle caused by something rubbing/vibrating. Jack it up in the air, hold it at a steady rpm where the noise is made and start poking your head around until you find the source. Exhaust rattles are very common, squeaky belts, AN hose rubbing, loose bolts can also rattle, I've even had the hood prop rattle before.

Przekop20

Okay let me be more clear its not a rattle its like a tick noise very random and sometime loud and then sometimes not loud

It is for sure coming from the block!

The head was taken apart and checked looked good there was no scoring on the pistons

Bearings looked good, The noise sounds like a little rock bouncing around in the motor but there is no rock in there lol

Timmerrr

I had this problem on my ep3, it turned out that the cat's heat shield was rusted thru and rattling arround. It sounded exactly like what you are describing and it drove me crazy trying to find it haha, I would suggest looking for loose bolts or anything else that could rattle around.

Przekop20

The Noise is for sure coming from the motor nothing is lose or rattling this is not a rattling noise,

the noise sounds like those white things u throw at the ground that make a pop noise when u were a kid lol

but its in the engine..... and it is very inconsistent

Muckman

iTrader: (2)

The fact that its inconsistent would rule out any kind of physical contact inside the block because that should be consistent with each revolution. Ie rod tapping bottom of sleeve or girdle, or thrust bearing, or loose rod bolt etc.

This is one of those things that nobody can help you without actually hearing the car.

Przekop20

Can a bad oil pump make the car idle surge

averyvm

iTrader: (1)

What about the speed or frequency of the tick. Does it speed up with engine speed or does it remain constant. Also the crankshaft rotates twice as fast as camshaft a ticking noise with a higher frequency would most like come from the bottom end. Also monitor oil pressure when the ticking starts. A drop in oil pressure would indicate that clearances are getting larger or oil pump not working correctly.

hondapowaaNZ

I currently have a very similar issue. I recently took my head of my b18c turbo to change the head gasket. Once I put everything back and started the car.. str8 away you could hear this noise on idle. It’s like a rattling noise. But as you give it a bit of gas the noise goes away.