2000 Toyota 4Runner Random Misfire Cyl 3

Tiny
KARIURIAS
  • MEMBER
  • 2000 TOYOTA 4RUNNER
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 171,000 MILES
Codes read a random misfire with Cyl's 1, 3 and 4. Changed out all the spark plugs, ignition coils/packs, and downstream o2 sensor, yet the check engine light came back on once the battery was hooked up and the car was driven for a mile. Does check engine light need to be reset? Or does this mean there is still a problem?
Friday, August 20th, 2010 AT 11:42 AM

5 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
What are codes?P0301-P0303-P0304 or P0300
Was MAF cleaned?Fuel pressure verfied? Do you have a scan tool? If yes does it have engine miss and freeze frame functions?
Let me know
Thanks for donate
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Friday, August 20th, 2010 AT 12:55 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
It could have retained memory, try this method to reset the ECM(PCM).
RESET PROCEDURE 2 1. Disconnect the negative battery cable for 5 minutes. 2. Reconnect battery cable. 3. Start the engine and warm it up to normal operating temperatures before test-driving. 4. Perform a thorough test drive with several accelerations from a stop with "light throttle" application until proper transmission shifting is verified. Does it run rough?
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Friday, August 20th, 2010 AT 12:56 PM
Tiny
KARIURIAS
  • MEMBER
  • 2 POSTS
Thanks for the feedback
to answer your questions:

Yes codes read: P0301-P0303-P0304
And yes the idle is rough, but smoother now that the ignition packs were replaced.
Do not have a scan tool, disconnected the battery, let car idle for 5 minutes then took test drive, and light came back on.
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Friday, August 20th, 2010 AT 2:12 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
3 out of four misfiring isnt good, lets check the fuel pressure and the egr valve for stuck open condition.

https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
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Friday, August 20th, 2010 AT 2:31 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
If you have a coil pack setup, did you possibly misroute the wires? Of coil on plug, probably couldn't.
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Friday, August 20th, 2010 AT 2:33 PM

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