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Running rough on 3 cylinders

Tiny
EGAZ11
  • MEMBER
  • 2001 TOYOTA RAV4
Engine Performance problem 4 cyl Two Wheel Drive Automatic 160000 miles

One morning I started my car and it was running on 3 cylinders- rough idle, poor acceleration, hesitating when giving gas. I replaced all the plugs and found a fouled plug in #3 but no improvement in power or idle. The check engine light code read misfire on #3 cyl. I have put two bottles of Lucas fuel injector cleaner in two full tanks and no help. Its not running hot and sometimes runs ok at higher speeds. Coil? F injectors? Cat converter? Plug wires? What can I do?
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Wednesday, April 28th, 2010 AT 4:26 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Yep first check to see if the #3 coil is working here is a guide to help you confirm.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

If it has spark lets check compression and then fuel injector operation here is a guide that will help you walk down the problems using easy tests.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please let us know what you find. We are interested to see what it is.

Cheers

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Wednesday, April 28th, 2010 AT 5:13 PM
Tiny
EGAZ11
  • MEMBER
  • 1 POST
Yep it was low compression my mechanic said it has a burnt exhaust valve and will cost 800.00 to fix. I will need to park it for while. Thanks for the help the guides are great.
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Thursday, April 29th, 2010 AT 5:03 PM

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