1997 4runner V6
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1997 4runner V6
Need help
Check engine light is on and blinks upon acceleration. I have a friend who is a mechanic and took it to his house checked it with a code reader. Reader came back with P0302 trouble code random misfire #2 cyclinder. We swapped coil packs, install new plugs, new wires, check fuel injectors with stethoscope all were clicking. We then went to the Chilton manual and for that code there can be coolant sensor, mass air flow sensor,fuel system pressure problems. Checked all sensors and replaced fuel filter. I did find the radiator cap broken and replaced that along with a new gas cap. All of this and I still have the same misfire. Has anybody heard of this problem??
Check engine light is on and blinks upon acceleration. I have a friend who is a mechanic and took it to his house checked it with a code reader. Reader came back with P0302 trouble code random misfire #2 cyclinder. We swapped coil packs, install new plugs, new wires, check fuel injectors with stethoscope all were clicking. We then went to the Chilton manual and for that code there can be coolant sensor, mass air flow sensor,fuel system pressure problems. Checked all sensors and replaced fuel filter. I did find the radiator cap broken and replaced that along with a new gas cap. All of this and I still have the same misfire. Has anybody heard of this problem??
Last edited by sgarfield; 12-22-2008 at 07:17 AM.
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Don''t be intimdated about posting this up in the 3rd gen section also to get better response.
You swapped coil packs so is it safe to say that #2 cylinder is still the misfiring one?
How does one check most of those sensors? You mean resistance was measured and it meets factory specs or what ?
I am no mechanic but will gladly help you talk this out.. you seem to have some mechanical knowledge probably much more than I do.
You did clear out the code right? Tell us what you did for that.
(not sure that would still be causing the misfire however)
Also be aware of Ultimate Yota, T4R.org, IH8MUD, pirate 4x4 for more response also.
You swapped coil packs so is it safe to say that #2 cylinder is still the misfiring one?
How does one check most of those sensors? You mean resistance was measured and it meets factory specs or what ?
I am no mechanic but will gladly help you talk this out.. you seem to have some mechanical knowledge probably much more than I do.
You did clear out the code right? Tell us what you did for that.
(not sure that would still be causing the misfire however)
Also be aware of Ultimate Yota, T4R.org, IH8MUD, pirate 4x4 for more response also.
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Did you clear the code? You can just disconnect the negative terminal from the battery for a few minutes to restart the ecu. And a moderator will move the thread if he sees fit.
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OK, so then you are using Denso or NGK double grounded plugs, and a paper filter.
So it should not be the plug, nor is it oil fouling the MAF.
Id give the MAF a clean for s and giggles.
Since you are not getting 2 misfires, and the misfire does not follow the coil, then your coil is most likely ok.
And you said you changed your wires, so they should also be fine.
So it should not be the plug, nor is it oil fouling the MAF.
Id give the MAF a clean for s and giggles.
Since you are not getting 2 misfires, and the misfire does not follow the coil, then your coil is most likely ok.
And you said you changed your wires, so they should also be fine.
Last edited by Godzilla; 01-05-2009 at 03:27 PM.
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thanks guys for giving some input. Hope the bump got it some attention
I am presuming the code has stayed consistent-so it is telling us it is the #2 cylinder
so has to be the plug or the plug pack right guys? or not that simple...?
I am presuming the code has stayed consistent-so it is telling us it is the #2 cylinder
so has to be the plug or the plug pack right guys? or not that simple...?
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Since its an even code, the issue may be plug, wire, coil. But if the code doesnt move around then it should be plug or wire.
When you switched the coil packs did you clear the codes before reading again?
And these are denso or ngk double grounded plugs right?
When you switched the coil packs did you clear the codes before reading again?
And these are denso or ngk double grounded plugs right?
Last edited by Godzilla; 01-06-2009 at 07:50 AM.
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Next time, once you clear the code with the OBD also discon. the negative battery. Apparently from what i have read re: misfires is that clearing the code via OBD wont change the baseline set by the ECM, but discon. the -ve terminal will.
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I will give that a try and let you know. I don't have the truck with me I ride a motorcycle to work. So I will reply tomorrow. Thanks for all your help!
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