1986 Toyota Corolla noise at 2k RPM

Tiny
HACHI
  • MEMBER
  • 1986 TOYOTA COROLLA
Engine Performance problem
1986 Toyota Corolla 4 cyl Two Wheel Drive Manual 1xxxxx miles

i've been working on y car l8tly and i've just noticed a odd sound when I rev the engine to about 2k rpm. There seems to be a knocking noise coming from the engine, in fact, it's loudest at the exhaust manifold.

but, this only happens when the engine has reached operating temp and only at 2k-2500 rpm. After that it returns to normal.

I've had this happen to me before but it was on a carburated SOHC version of the current engine( 4AG-E) that is in there now. The SOHC engine ended up having a real bad knock which I do believe ended in a dead hole. But, in the SOHC engine the knocking was constant as for this one is just at 2-2500 RPM.

I pray that this isnt a pre-mature knock that will lead to a dead hole. Can u guys help me diagnose this further.

any help would be greatly appreciated.

thank You
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Thursday, August 7th, 2008 AT 10:27 PM

3 Replies

Tiny
ROB2008
  • MEMBER
It may need the valves adjusted. Is it something like a ticking noise?
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Thursday, August 7th, 2008 AT 10:40 PM
Tiny
HACHI
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Yeah now that u mention it, it is like a loud ticking. Come to think, my cousin had the exact same problem with his engine ( he has the exact same engine that I do in his car '85 MR2 ) but oddly enough the ticking noise that his engine was making went away on it's own.

So if it is the valves then how much would it be to get it fixed? I understand that the price is dictaded by where I live and the labor rate but it also depends on how many hours that job is said to take in the repair/service manual correct?
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Friday, August 8th, 2008 AT 12:11 AM
Tiny
AIRSOFTSOLDRECN9
  • MEMBER
Most likely it is not a valve spring but a sticky hydraulic lifter, which can be cleaned by removing all internals and using some kerosene. You need to make sure pre-ignition is not a possibility so check the spark plugs for burned electrodes/ large gap. OHC and DOHC engines require different tools than OHV engines. It is a bit more costly and tedious so if you plan on doing the removal and installation of the cylinder head yourself I would expect to shovel out 250-400 just for the valves. Depending on the wear of the cam and lifters another 200-300 might be necessary for a cam and lifter kit plus 50 for a timing belt.
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Friday, August 8th, 2008 AT 1:40 AM

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