Question about 2001 Toyota RAV4

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Hi, I have a 2001 rav4 that has all the cylinders misfiring. was running fine for the last 9 years then this. It started while i was on the highway. for 3 of the cylinders the possible problems are weak/missing spark, plugged fuel injector, engine mechanical fault, or large vacuum leak specific to cylinder. for the other two codes that popped up the probable causes were low fuel pressure, faulty MAF/VAF sensor, cylinder misfire condition, faulty HO2S/AF sensor, large vacuum leak, ignition system fault. what is most likely the problem.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 1861 Answers

SOURCE: check engine light is on the code was po300

I respectfully disagree.
A P-0300 will NOT be set in a Corolla by a dirty fuel filter.
Replacing the fuel filter could be a very costly operation, as I have observed that the fuel line threads that connect to the fuel filter easuily get damaged when removing the fuel filter.

In short, don't replace the filter until you are SURE that it is the culpit.
In this case, the fuel filter is NOT the culprit..
Save your money; and your time.
Additionally, premium fuel does not clean fuel injectors. That expense would be a waste of money. The engine will actually run WORSE on premium fuel; the engine is NOT designed to run on premium. 87 or 89 (better choice/89) is the grade to use.

If you really want to track down the P-0300 code, which is a multiple/random cylinder misfire, I would look at the quality of the fuel in the car; ie water in the gas. Second, I would remove the plugs and examine them closely. A worn center electrode will also set the P-0300 code, as will bad/weak plug wires (over 5 years old).

Please feel free to contact me back if you need further assistance. Thanks for choosing FixYa for assistance.

Posted on Mar 05, 2009

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dmsr63
  • 2050 Answers

SOURCE: misfiring

See what cylinder is loosing (if that's it) spark. Use a spark tester if you can, or remove plugs and turn it over with the wires on all of the plugs, grounded!

Posted on Jul 29, 2009

  • 753 Answers

SOURCE: setting code P0300- random multiple

This could be any number of problems in your spark system but most likely your control module for your spark plug coils.

Posted on Aug 22, 2009

  • 58 Answers

SOURCE: 2003 tahoe

For p0300 ,p0240 on chevy tahoe 00- 06 check a wire going along with the battery ground to the engine block thre should be a high resistence on the small wire ,it gets corrode over time ,it should be located on underneath of the driver side engine,

Posted on Feb 19, 2010

  • 1374 Answers

SOURCE: 2006 RAV4 V6 multiple cylinder misfire, VSC, check engine and sli

You need a scanner to pull out the engine light codes.
Use a shopu manual to aid you with the diagnosis and repair.
The slip indicator and vsc light being on means these systems are not working. Once you pull the codes and do the repair and erase the codes the lights will go off.
There will be a code in there for the misfiring.
Good luck and keep me posted.

Posted on Mar 09, 2010

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