Quote:
Originally Posted by spp88
'96 4-Runner, V6. 113K miles. I have a check engine light which returns code P0302, misfire on cyl. #2. The first time, there was no strong misfire felt until after several driving cycles. Cleared the code (added some FI cleaner to the tank) and everything was good for a week but then the CE light came on and the misfire was felt. Once again code P0302. My reading so far leads me to an intermittent injector failure, but here are my questions before I dig in.
1. Will the ECU cut off fuel to an injector after a misfire code is detected? I don't know why, after removing the code the engine runs fine for quite a few cycles without a noticeable misfire. Once the "felt" misfire occurred, it would not run right until the code was removed.
2. Is there a way to check the injector function (e.g. resistance) without removing it?
3. Silly as it might be, Can someone confirm that Cyl #2 for code P0302 is the front drivers' side or lead me to the correct one? My reading so far is less than clear on this point.
Thanks.
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1. Not that I know of. The fuel goes to the injectors by way of the fuel rail. All injectors are feed by the same line.
2. You can use a screwdriver or mechanics stethoscope to listen to it. You should be able to hear a difference between other injectors if the number two is not firing correctly. You can check the resistance by unplugging and ohming the leads. The resistance is approx. 13.8 Ω at 20°C (68°F)
3. Yes, #2 is the front driver side.
How long since you did spark plugs and wires? Before digging into injector replacement I would first swap coilpacks to rule that out. Then I'd change the plugs and wires and make sure you use dual ground NGK or Denso. If you can rule out plugs/wires and coilpacks/boots the injector would be the next logical step.
Some may say to check compression as well but in all the threads I've ever read on this issue that has not been the issue.
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