1987 Toyota Corolla rough idle on cold start.

Tiny
SNOWJERK
  • MEMBER
  • 1987 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • MANUAL
  • 245,000 MILES
On a cold start # 4 cylinder is not hitting. It has a good strong spark, new plugs, wires, and intake gasket. Has good compression across all four cylinders. After it warms up # 4 hits fine. It does have a 2 barrel carb. Checked for vacumm leaks with carb cleaner but found none. Could the intake be warped or possible valve adjustment needed?
Sunday, September 27th, 2009 AT 3:15 AM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
If you had a bad valve it should have shown up on the compression test.

If you have good compression and spark, the only thing missing is fuel.

I would try a can of SeaFoam in the tank, see if it helps clean the varnish in the carb.

If a 4ALC engine, valve clearence is relitively easy to set.
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Sunday, September 27th, 2009 AT 7:15 AM

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