HELP! P0301 Code - Misfiring
#1
HELP! P0301 Code - Misfiring
Hey guys, hopefully someone can shed some light on a misfiring issue i am having. I have a 2000 Tacoma Pre-Runner 6cyl and it through a CEL a few times but it ONLY does it after the truck has been driven for a bit, turned off, then started back up in a bit (take it home for lunch from work, then does it when i go back to work). Often times on the way back to work it will go away, the misfiring. It idles rough while its doing it but not bad enough to shut off. I have just replaced all 6 spark plugs with NGK's dual grounded to spec and also have put SeaFoam in the tank and vacuum booster but its still doing it.
I can't seem to figure out why it only seems to do it when its hot and been driven, turned off, then started again. Never does it happen in the morning when its cold.
Any ideas?
Thx
I can't seem to figure out why it only seems to do it when its hot and been driven, turned off, then started again. Never does it happen in the morning when its cold.
Any ideas?
Thx
#4
Registered User
If you swap coil packs with hole 3 and the miss moves, you can rule out the injector and I would then get all 3 new boots and see how it is. If the miss doesn't move when you swap coils, then chances are it's the injector.
Last edited by brian2sun; 07-15-2010 at 03:37 PM.
#5
Ok so I just swapped the coil and boot from Cyl1 and Cyl5. Will see how she fares tommorow.
Btw, while i was in there i checked the resistance on the 1,3,5 injectors and got the following:
#1 = ~1-5M ohms
#3 = 16 ohms
#5 = 16 ohms
...so maybe the injector is the culprit? What causes high resistance vs no resistance in fuel injectors?
Btw, while i was in there i checked the resistance on the 1,3,5 injectors and got the following:
#1 = ~1-5M ohms
#3 = 16 ohms
#5 = 16 ohms
...so maybe the injector is the culprit? What causes high resistance vs no resistance in fuel injectors?
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#8
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Join Date: Feb 2010
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try www.toyotapartszone.com for 15% off list price.
The wire harnesses can be brittle around there. To avoid breaking them, members have found wrapping the wires and the wire loom bundles in electrical tape before manifold removal.
#10
Ok, so I moved the coilpack from #1 to #5 and I still have the problem but I cant get the truck to throw a CEL. Without that I cant see where its misfiring. Is there any way to help it throw a CEL for the misfiring its doing?
#11
BTW, its doing it still at the exact same time. Right at lunchtime midday after having my truck sit for about an hour, then started again to go back to work. The hesitation lasts for about 1 mile then stops. Then the truck runs like a champ from then on.
#12
Registered User
did you use DI-ELECTRIC grease when you changed spark plugs??? this solved the same issue for me!!! that crazy clear gunk in the drop tubes "DI-ELECTRIC" was put there for a reason and many people clean it off and think there is no reason for it but TRUST ME TOYOTA PUT IT THERE FOR A REASON!!!!
#13
Its FIXED!!!
I want to thank everyone for their input. I ended up replacing the #1 fuel injector with an BG replacement one and the ohm readings all match up with the rest, even after driving then letting it sit like I normally did to produce the misfiring on #1. FWIW, I did not have to remove the intake plenum, only the throttle body. It was a pretty easy task. I also replaced the o-rings on all the injectors that got removed from the fuel rails.
Thanks again, perfect troubleshooting guys...
I want to thank everyone for their input. I ended up replacing the #1 fuel injector with an BG replacement one and the ohm readings all match up with the rest, even after driving then letting it sit like I normally did to produce the misfiring on #1. FWIW, I did not have to remove the intake plenum, only the throttle body. It was a pretty easy task. I also replaced the o-rings on all the injectors that got removed from the fuel rails.
Thanks again, perfect troubleshooting guys...
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