Question about 2003 Toyota Highlander

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2003 highlander 4cyl at idle, knocks. Not lifter knocks but a miss as if a cylinder not firing

I have changed plugs, checked for vacuum leak, battery is good...told its not my alternator. Checked and WD 40ed the springs in my coils...stuck help!!! Chris

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  • ckquinn1 Jul 09, 2013

    solved, coil on plugs bad, rewplaced all four runs like a champ



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  • 2,101 Answers

Well never ever spray any fluid in a boot of a coil use only electric grease only

Posted on Nov 06, 2012


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Posted on Jan 02, 2017

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I have a 95 toyota corolla sedan. Put in new rebuilt engine, fired it up, it ran for 5 seconds, then i have no spark? what is it? I changed the igniter, still no spark

Posted on Feb 06, 2009

michigan man
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SOURCE: engine idles rough, misses at 2500-3000 rpm's

i would first check the timing and if that does not fit i would take the cover back off and look at the belt for a bad or missing tooth

Posted on Feb 14, 2009

  • 463 Answers

SOURCE: my 2000 v8 toyota tundra suddenly lost power

Does this motor have the equivalent of crank-trigger ignition? If so, is the sensor A-OK?

Posted on Mar 02, 2009

  • 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

Toyota Guy
  • 42 Answers

SOURCE: 1984 toyota pickup 22r motor. No fire to distributor

At the cost of the igniter i recommend checking your pickup coil.( The 2 wire sensor in side of your distributor. The The igniter will not allow the coil to fire with out reference form the pickup coil. Coil has primary and secondary resistances. when the primary coil powers up and then pulses off, this cause a high voltage due to magnetic degeneration. Check the coils primary and secondary resitances along with the air gap in the pickup coil, and also check the resitances on the pickup coil. If i am right your igniter will be okay.Get a good manual for you truck, It will save you money down the road.
Toyota does not have at test proseger for the ingiter.

Also check the wires in between the pickup coil and the igniter.
I hope this helped.

Posted on May 04, 2009

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My sisters 01 town&country engine light comes on auto store says #5 miss fire so changed all plugs they looked good has new wires nd since only one cylinder miss fire auto store says its mostlikely not...

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At idle the engine misses, off idle very smooth and runs normally computer code multi cylinder misfire. have changed plugs and wires did not help. could it be the coil packs of a fuel problem?

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I just purchased a 96 ford taurus with a 3.0 engine. It's misfiring. I replaced the plugs( autolites ) and gapped the at .044 ( according to autozone). I also replaced the wires, pcv, and air filter. It...

You can go to Autozone or Oreillys for a free scan. Usually the onboard computer will pickup an electrical problem. There may be something recorded that a scan will show.

If not, look for nonelectrical problems like Vacuum leaks. Take a water spray bottle and go around the Intake and Vacuum lines, a change in RPM would indicate a leak. You could have a dirty Injector which is firing Electrically, but clogged. Since each cylinder bank averages all 3 cylinders for RICH and LEAN errors, an Intermittent miss would not show as easily.

If you have the oldstyle Vacuum gauge, it would show fluctuations for problems in Valve action. Like a Valve not closing due to Carbon buildup, a weak Valve spring, a clogged Lifter, all things not electrical. So if the result indicates possible clogs, you can get Professional cleaning of the Injectors or try a gas additive. You may need a product such as an oil additive, like Lubegard to free the Lifters.

Thanks for using Fixya!

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Miss fire in cylinder 1 and 4

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