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Don's 08 STI. STI Hatchback/Wagon or bust!
Don's 08 STI. STI Hatchback/Wagon or bust!
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Old 07-24-15, 10:46 AM   #131
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Default Re: Don's 08 STI. STI Hatchback/Wagon or bust!

Fixing the vacuum leaks brought the power back and improved my gas mileage.
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Old 07-25-15, 06:02 AM   #132
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Default Re: Don's 08 STI. STI Hatchback/Wagon or bust!

I'm curious, mind elaborating on the locations you found leaks? I'd like to check the same areas.
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Old 07-25-15, 04:07 PM   #133
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Default Re: Don's 08 STI. STI Hatchback/Wagon or bust!

Both Evap solenoid lines by the inlet tube and bypass valve vacuum hose on both ends.
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Old 07-30-15, 07:45 PM   #134
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Default Re: Don's 08 STI. STI Hatchback/Wagon or bust!

The NGK spark plugs didn't last long. I gapped them to .025" and they are a year old and 18k miles. The gap enlarged to almost .030"! It had been misfiring in the #3 cylinder and I decided to go with Denso iridium IKH22 and gap the to .023".
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Old 08-06-15, 08:28 PM   #135
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Default Re: Don's 08 STI. STI Hatchback/Wagon or bust!

#3 cylinder misfire is still there, but not as bad with the new plugs. I went ahead and replaced the #3 cylinder ignition coil. Test drive tomorrow while driving to work.
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Old 08-10-15, 11:26 AM   #136
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Default Re: Don's 08 STI. STI Hatchback/Wagon or bust!

Misfire is still there. I removed and clean off the crank position sensor and it smoothed it out a bit after ecu reset. I need to drive it more to see if it's relearning the stumble. I do have a new O2 sensor to install. Hopefully it fixes that and improve power, response, and fuel mileage.
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Old 08-13-15, 06:36 PM   #137
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Default Re: Don's 08 STI. STI Hatchback/Wagon or bust!

The new O2 sensor brought back some pep. I need to drive it more to see if it reverts to misfiring again. It has better throttle response and part throttle power. It looks promising. So far, it seems like the old O2 sensor was a little lazy as it did not set off a CEL for the O2 sensor.
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Old 08-13-15, 06:46 PM   #138
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Default Re: Don's 08 STI. STI Hatchback/Wagon or bust!

Which O2 sensor did you go with?
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Old 08-13-15, 06:57 PM   #139
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Default Re: Don's 08 STI. STI Hatchback/Wagon or bust!

Denso. Fits just like OEM. It even has the zip ties mounted to reuse the bracket mounted to the #3 ignition coil.
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Old 08-13-15, 07:13 PM   #140
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Default Re: Don's 08 STI. STI Hatchback/Wagon or bust!

Quote:
Originally Posted by STIGR-Wagon-Dad View Post
Denso. Fits just like OEM. It even has the zip ties mounted to reuse the bracket mounted to the #3 ignition coil.
Right on. I was looking at them yesterday. Bosch was stated as the replacement favorite, but Denso is the OEM one. Did you end up replacing both upstream/downstream locations?
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