02-17-2023, 11:36 PM
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#46
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Quote:
Originally Posted by Langcow1
Well I’ve been going about this bassackwards. My friend suggested that misfiring without the CEL on likely means that the CEL isn’t working. Sure enough, code reader gave me a cylinder 6 misfire. Swapped the ignition coils between 3 & 5, cleared codes, checked again and it’s still a cylinder 6 misfire. I guess it could be the wire or plug but in a roundabout way I am likely back to the #6 injector like the original mechanic said.
(Plugs, wires, coils were all changed with new Densos 14,000 miles ago, and the injectors were changed at the same time with a set from Motorwest, and I do have another set from Motorwest that they sent me a couple of weeks ago under warranty)
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I’d swap the spark plugs and resistance check the wires before going through the effort of changing injectors again. Injectors are not a common failure point.
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02-18-2023, 10:41 AM
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#47
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Quote:
Originally Posted by Langcow1
Well I’ve been going about this bassackwards. My friend suggested that misfiring without the CEL on likely means that the CEL isn’t working. Sure enough, code reader gave me a cylinder 6 misfire. Swapped the ignition coils between 3 & 5, cleared codes, checked again and it’s still a cylinder 6 misfire. I guess it could be the wire or plug but in a roundabout way I am likely back to the #6 injector like the original mechanic said.
(Plugs, wires, coils were all changed with new Densos 14,000 miles ago, and the injectors were changed at the same time with a set from Motorwest, and I do have another set from Motorwest that they sent me a couple of weeks ago under warranty)
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Ah burned out cel.. ok..
Sent from my SM-A536V using Tapatalk
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread: https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer: https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information: https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html
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02-18-2023, 04:09 PM
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#49
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The weird thing is this is the 3rd one that has gone bad. I had one die in late 2020 if I remember right. Had that one replaced; I think it was an odd numbered one. Then another died in Spring 2021 so that’s when I had a friend help me replace the whole set with Motorwest, figuring I wouldn’t have to hear about fuel injectors again for a while!
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02-18-2023, 04:22 PM
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#50
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Could a dirty fuel filter be killing my injectors?
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02-19-2023, 08:37 PM
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#52
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I swapped the #6 and #2 spark plugs and I replaced the wires with a brand new set of NGK’s. Unhooked the battery for a while to reset the codes. When I started the engine it was still idling rough. Driving it around, it seems to be a little better than before but when I got the codes checked, AutoZone still says P0306 but it’s only a secondary Diagnostic Trouble Code. I repeated this a second time to be sure: disconnected the battery, cycled the ignition key 12 times, left the battery disconnected a little longer, and then drove it a good 15 miles on the highway before checking the codes again. Same thing - Secondary DTC Cylinder 6. I’m not entirely clear on the definition of a secondary code. Is it not clearing when I disconnect the battery? Both tests since changing the wires haven’t given a primary code.
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02-20-2023, 05:15 AM
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#53
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Quote:
Originally Posted by Langcow1
Well I’ve been going about this bassackwards. My friend suggested that misfiring without the CEL on likely means that the CEL isn’t working. Sure enough, code reader gave me a cylinder 6 misfire. Swapped the ignition coils between 3 & 5, cleared codes, checked again and it’s still a cylinder 6 misfire. I guess it could be the wire or plug but in a roundabout way I am likely back to the #6 injector like the original mechanic said.
(Plugs, wires, coils were all changed with new Densos 14,000 miles ago, and the injectors were changed at the same time with a set from Motorwest, and I do have another set from Motorwest that they sent me a couple of weeks ago under warranty)
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When you replaced the wires did you also replace the bootie on the coil? All my missfires have been the spark burning through the coil boot.
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02-20-2023, 03:24 PM
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#54
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I didn’t swap those but I’ll double check them. I don’t remember them looking particularly funky. I did swap the #3 and #5 ignition coils a few days ago and the misfire code didn’t move.
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02-21-2023, 06:24 PM
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#55
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Quote:
Originally Posted by Langcow1
I swapped the #6 and #2 spark plugs and I replaced the wires with a brand new set of NGK’s. Unhooked the battery for a while to reset the codes. When I started the engine it was still idling rough. Driving it around, it seems to be a little better than before but when I got the codes checked, AutoZone still says P0306 but it’s only a secondary Diagnostic Trouble Code. I repeated this a second time to be sure: disconnected the battery, cycled the ignition key 12 times, left the battery disconnected a little longer, and then drove it a good 15 miles on the highway before checking the codes again. Same thing - Secondary DTC Cylinder 6. I’m not entirely clear on the definition of a secondary code. Is it not clearing when I disconnect the battery? Both tests since changing the wires haven’t given a primary code.
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Many codes are two-trip codes. First time it shows up, the error is stored on the ECU's memory but does not display the light. Second time it shows up the CEL lamp illuminates on the dash. It prevents unnecessary codes showing up from one-time situations that are not really problems, just flukes. This is one of those codes. Some readers will call it a "Pending" code.
Also, if pulling the battery is messing up anything else you have connected you can reset the codes and fuel trims by pulling the EFI fuse (fuse, not relay) in the engine bay fuse box. I find myself having to do the same about every 6 months or so because of this or that and it means less things have to be reset or re-learned.
Last edited by gamefreakgc; 02-21-2023 at 06:36 PM.
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02-22-2023, 03:18 AM
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#56
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I did finally go buy a code scanner so I can reset it now. It keeps throwing P0306 so maybe it really is the injector at this point. I’ll post back with an update once I know for sure one way or the other.
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02-28-2023, 03:16 AM
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#57
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Great news - running good again. It really was the injector!
Thanks again for all your help everybody 👍🏻
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02-28-2023, 07:31 PM
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#59
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Quote:
Originally Posted by Langcow1
Great news - running good again. It really was the injector!
Thanks again for all your help everybody 👍🏻
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That was the best case scenario! So glad you got it fixed and back on the road driving confidently again!
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03-01-2023, 03:45 AM
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#60
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It’s running great now. It could just be in my head but it seems like it has more power since I switched the Denso sparkplug wires to NGK
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