1997 Toyota Corolla ruff idle

Tiny
MMERTEN
  • MEMBER
  • 1997 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 156,000 MILES
I had just replaced the head gasket, head was warped and had it machined. Lined up timing marks as best as a could very hard to fit in there. Turned over motor nurous tiime to make sure it was right. But on start up I have a ruff idle and lack of power till mmid range. I know there is no adjustment to the distritor any ideas, looked for vac lines but nothing jumping out.

Thanks Again for all your help.
Mike
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Tuesday, October 21st, 2008 AT 11:01 AM

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Tiny
MMPRINCE4000
  • EXPERT
Any valve train noise? Ticking, clanking?

You must replace the valve shims in the exact order they were removed. If not, it is possible yo have a valve not completely closing, or opening.
Also recheck the timing marks on the timing belt side, and I would run a compression test to make sure the headgasket is secure.
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Wednesday, October 22nd, 2008 AT 8:52 AM
Tiny
MMERTEN
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I did not replaced them in order, Damn now what can I do to make it right? Or what is the correct prosedure to do it? Is it in a manual?

Thanks again
Mike
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Wednesday, October 22nd, 2008 AT 3:08 PM
Tiny
MMPRINCE4000
  • EXPERT
You will have to measure valve clearence on each valve (cold engine).

Write down each clearence measurement and record cylinder # and wheather intake or exhaust.

The manual will list the valve clearence range.

Determine which valves are out of range.

You can then use a special tool set to move the shims to correct place, after measuring shim thickness, comparing it to shim thickness of wrong shim, subtracting the measurements and determining if that shim thickness on that cylinder would bring valve clearence within spec.

While you can buy new shims from Toyota, they are about $10 each, sold individually. New shims would be easier but more costly. If you measure valve clearence on #1 intake and it is.002 and spec is.008, you would measure shim thickness of bad shim and get new shim.006 thinner.

You want to get this done ASAP, because if you have a valve too tight, you can damage the camshafts.
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Thursday, October 23rd, 2008 AT 5:54 AM

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