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09-08-2020, 12:27 AM | #1 |
Scooby Newbie
Member#: 505672
Join Date: Aug 2019
Vehicle:2018 WRX STI World Rally Blue |
[SOLVED!] 18 STI misfire on boost no CEL
[SOLVED!] When ever I hit 5+ PSI of boost I get misfire, no CEL so I can't tell which cylinder it is. I've put in new cold NGK plugs gapped to .025 and it's still bad tuner suspects bad coils since the ARF readings are normal until boost, he think's because of weak spark but before I spend 400 on a new set of coils I did some resistance readings on every coil and got .8k ohms on the first and about 7K ohms on the second for every coil. I compared them to a AutoZone replacement coil and got readings of 1.2K ohms on the first and 4.5 on the second. I'm going to get a new OEM coil from Subaru tomorrow to see what it's readings are but I doubt all 4 of my coils are bad unless the AutoZone coil is closer to OEM which I doubt. What are y'alls thought?
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Last edited by Zeluhs; 09-20-2020 at 05:09 PM. Reason: solved |
09-08-2020, 08:13 AM | #2 |
Scooby Specialist
Member#: 495950
Join Date: Jan 2019
Chapter/Region:
South East
Location: Augusta, GA
Vehicle:2011 WRX WRB |
Have you checked for boost leaks
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09-08-2020, 12:33 PM | #3 |
Scooby Newbie
Member#: 505672
Join Date: Aug 2019
Vehicle:2018 WRX STI World Rally Blue |
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09-10-2020, 10:14 AM | #4 | |
Scooby Newbie
Member#: 505672
Join Date: Aug 2019
Vehicle:2018 WRX STI World Rally Blue |
Update
Quote:
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09-11-2020, 03:42 PM | #5 |
Scooby Newbie
Member#: 461898
Join Date: Jan 2017
Chapter/Region:
MWSOC
Location: Ohio
Vehicle:2004 Forester XT MT 01G |
Pull your plugs and double check the gap?
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09-12-2020, 12:50 PM | #6 |
Scooby Newbie
Member#: 505672
Join Date: Aug 2019
Vehicle:2018 WRX STI World Rally Blue |
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09-12-2020, 01:29 PM | #7 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
so how do you know its a misfire? and did it misfire before the tune and other stuff?
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09-20-2020, 05:09 PM | #8 |
Scooby Newbie
Member#: 505672
Join Date: Aug 2019
Vehicle:2018 WRX STI World Rally Blue |
Solved!
Figured it out, first tuner I went to is a massive moron. It was a massive boost leak from the turbo L pipe to the intercooler. No idea how they missed that but I will never be going back to them. Had to go to Dallas to see AWDTuning they know subies.
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