Cyl 1 misfire... - SB9T.com
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Old 06-29-2019, 07:50 AM   #1 (permalink)
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Angry Cyl 1 misfire...

I just bought an 06 b9 and it has a hard miss on cyl 1. I replaced the plug because someone had put honda plugs in it and I swapped the coils around and it came back cyl 1 miss again! So I tested power to the injector while running and it is firing, I stethoscoped the injector and it was clicking... I even tested the red/yellow wire from the ecu and it has power...

Last edited by mark458; 06-29-2019 at 08:03 AM.
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Old 06-29-2019, 05:34 PM   #2 (permalink)
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The 2 most common cause for hard miss (once the easy things have been ruled out) is either the ECU not firing the spark (sounds you already know this is okay) or valve trouble. Sounds like the later. It happens, but its not that common.
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Old 06-30-2019, 01:15 AM   #3 (permalink)
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Quote:
Originally Posted by mark458 View Post
I just bought an 06 b9 and it has a hard miss on cyl 1.
if you have fuel injection and spark at right moment, so next would be to check compression in all six cylinders and compere with cylinder #1.
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Old 06-30-2019, 11:16 AM   #4 (permalink)
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The 2 most common cause for hard miss (once the easy things have been ruled out) is either the ECU not firing the spark (sounds you already know this is okay) or valve trouble. Sounds like the later. It happens, but its not that common.
Well theres no popping out of the intake or exhaust... so I don't see how it could be a valve... but for some reason Im feeling like even though its not the coil that Im still not getting fire to the coil... I got a steady 14v while running but I didn't see any pulsating...
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Old 06-30-2019, 02:40 PM   #5 (permalink)
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You need to verify the pulses from the ECU to the coil.
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Old 07-01-2019, 06:43 AM   #6 (permalink)
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You need to verify the pulses from the ECU to the coil.
Ok so red/yellow wire with test light to positive term. Ill do it today.
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Old 07-02-2019, 11:08 AM   #7 (permalink)
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Test light flashes appears to be flashing... About to do a compression test... What would cause a dead cylinder if its not smoking... not popping...
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Old 07-02-2019, 11:36 AM   #8 (permalink)
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Check out subaruoutback.org for more info on H6 misfires: https://www.subaruoutback.org/forums...q=H6%20misfire

This is a thread with an example of the ECU causing problems: https://www.subaruoutback.org/forums...ylinder-2.html

Is the miss 100% of the time?

Tom
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Old 07-02-2019, 12:42 PM   #9 (permalink)
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OK TOTALLY LOST HERE!! Compression test came back 210psi... I MUST be doing SOMETHING WRONG! Can someone please guide me thru diag for cyl 1?
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Old 07-02-2019, 02:12 PM   #10 (permalink)
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I hate this car!!! I took a coil from an impreza and the car ran great!... for 15 minutes then it started misfiring again!
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Old 07-02-2019, 02:40 PM   #11 (permalink)
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Follow this posts' steps:

https://www.subaruoutback.org/forums...-cylinder.html
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Old 07-04-2019, 09:43 AM   #12 (permalink)
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OK I feel dumb. The injector is fine but I have no ground from the ecu.

Ive ordered another ECU off ebay for $50.

I have a scan tool that can write VINs to ECUs... Hopefully that's all I have to do.

Last edited by mark458; 07-04-2019 at 01:02 PM.
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Old 07-12-2019, 02:20 PM   #13 (permalink)
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OK IM pissed! The guy in the post I was referred to said he took his car to the dealer and they programmed it. I just called the dealer and they said you can NOT rewrite the VIN to a used ECU. That I just waisted my money!

My tool said It cannot rewrite a VIN too.
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Old 07-24-2019, 04:07 PM   #14 (permalink)
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Ok got my ECU back from https://moduleexperts.com/ today, installed it and now the car runs perfect!
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Old 07-25-2019, 01:26 PM   #15 (permalink)
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Quote:
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Ok got my ECU back from https://moduleexperts.com/ today, installed it and now the car runs perfect!
wow - very good news, thanks so much for the follow up.
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