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?
Do you
have the same problem?
Yes
No
Friday, August 20th, 2010 AT 11:42 AM

5 Replies

Tiny
DOCFIXIT
  • EXPERT
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
Was this
answer
helpful?
Yes
No
Friday, August 20th, 2010 AT 12:55 PM
Tiny
MERLIN2021
  • EXPERT
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?
Was this
answer
helpful?
Yes
No
Friday, August 20th, 2010 AT 12:56 PM
Tiny
KARIURIAS
  • MEMBER
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.
Was this
answer
helpful?
Yes
No
Friday, August 20th, 2010 AT 2:12 PM
Tiny
MERLIN2021
  • EXPERT
3 out of four misfiring isnt good, lets check the fuel pressure and the egr valve for stuck open condition.

http://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
Was this
answer
helpful?
Yes
No
Friday, August 20th, 2010 AT 2:31 PM
Tiny
MERLIN2021
  • EXPERT
If you have a coil pack setup, did you possibly misroute the wires? Of coil on plug, probably couldn't.
Was this
answer
helpful?
Yes
No
Friday, August 20th, 2010 AT 2:33 PM

Please login or register to post a reply.

Recommended Guides