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Tapping Sound Coming From Engine

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hi, i'm new to this forum.

recently i replaced the blown engine out of my r33 gtst skyline with another one that i bought off ebay. everything went in and it starts and everything. however, there it has a few problems.

1) the revs fluctuate betweeekn 500 and 1300 rpm.

2) when driving and coming to a complete stop when you have the clutch in it just wants to stall out.

3)there is this fkn loud tapping sound comming from the bottom of the inlet side of the head. ( a few people have told me that it could be the lifters) personally i think the person who put the timing belt on originally it could be a tooth out but would it cause this problem? and the car goes really shit not smooth at all!!!!!!!

4) when coming on boost, the car just backs off by itself liek it sputters and missfires.

ive nearly had enuf of this car lol.. plz help. Thanks in advance

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1. Check AAC Value - also related to #2

2. I reckon you have a vac leak in a hose somewhere. Go over them all and find it

3. Could be anything fron noisy injectors, to lifters. Get a mech to check if unsure

4. AFM or, again the vac leak causing issues, spark plugs possibly, coils... could be many things

Basically you have common problems that are all trial and error mate.

Just keep checking parts, and have a read of various 'misfire' threads in this section that go over various problems.

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AFM for the idle problem, stalling might be caused by a incorrectly place hose or not sealed like a atmo blow off valve. Also sure its not doing R and R rich and retard. The ticking most likely bad seated exhaust manifold, Check intercooler pipes and what not.

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i mean liek a really loud tapping sound at idle.. and this gets louder the more u rev... it sounds like the cam is hitting the lifters

Sounds like big end bearings to me ..... Is it louder when the engine is hot ???

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I was having a chat with my mechanic the other day and he said the tappet noise may actually be the big end as the sound resonates up through the engine. Go to a mechanic

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Im pretty sure that if it was a spun bearing the engine would be dead by now as once they go, they don't last much longer so i don't think its that.

If it gets louder with revs its obviously something that rotates and increases in speed so check your timing belt, tensioner, cam gears etc. If not then yeah it could have something to do with your cams/lifters.

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I've got the same problem with loud tapping sound on my R34 GTT except that it isn't always there, it's intermittent. I suspect VVT as it's comming from around the same area where VVT is situated on the intake cam. I know that SR20 from S14 and S15 are notorious for noisy VVT so I suspect that RB might have the same problem.

It'd be interesting to know what your mech's verdict would be.

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i had that for a day or 2, turned out to be my radiator fan hitting the intercooler piping :P

Haha, I had the same problem. I removed the insulation from under the bonnet and problem solved. Seems the bonnet+insulation was pushing down on the i/cooler piping and as a result the fan was hitting it. :P

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This may be a few things.. but i think its the oil not getting up the top of engine quick enough? What viscosity oil are you using?

not sure wat oil, i put synthetic oil that was recommended from autobarn

they looked up my car in a book?

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