STi #4 ringlands blown! Time to build it! - Page 5 - Subaru WRX Forum
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post #61 of 65 Old 03-14-2012, 12:24 AM Thread Starter
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I feel so absent from the forum. I cleaned the MAF, have checked the throttle sensors through the AP, and swapped the A/F sensor. I'm still getting the weird hesitation under light acceleration. I also checked for vacuum leaks, especially around the wastegate. About the same time the whole issue started, my power steering also got a little weak at idle. It is functioning otherwise, as long as I've given it some revs. I understandit could all be coincidence, but i hope they are related. I have also had a couple check engine lights (misfires on downshifts) that should be related to the flywheel. The CELs are very rare. I'm not sure what's left to test. I hope it's not coil packs, but the dealer told me they checked out fine. I'm hopimg maybe someone with more build experience can chime in or has some advice on whats to check next... Any thoughts?

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post #62 of 65 Old 03-14-2012, 02:02 AM
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I had that exact problem. I've not read through this threadi in some time. Did you replace the egt sensor, three one plugged into the down pipe? That caused me hesitation for two years.

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post #63 of 65 Old 03-14-2012, 11:03 PM
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Either way, its great to see you back on the forums Brad. Sorry, I can't help out though.

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post #64 of 65 Old 08-30-2012, 03:06 PM Thread Starter
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Quote:
Originally Posted by Chase View Post
I had that exact problem. I've not read through this threadi in some time. Did you replace the egt sensor, three one plugged into the down pipe? That caused me hesitation for two years.
When you're talking about the EGT in the down pipe, do you mean the A/F sensor? That's one that the dealer checked out and said was good too. I'm going the route of improving the grounds to see if that fixes it, then I'll go back to the sensors. I've read that the coil packs use the intake manifold ground that is upper driver-side. I've got plenty of spare 4 gauge wire that I used for stereo installs, and the crimp terminals to finish the ends. I'm thinking even if it gives me NO fix to the hesitation, I'll at least have done something simple that will narrow out buying another $75 sensor that might not solve it. I threw money at the front A/F sensor thinking it would for sure be it, and that turned out to be a waste - no fix. I hope I can come back to this forum and report that I've solved the problem.

If I knew what to tap into to check continuity and resistance, I'd do some checks on certain points and sensors before and after. I don't know, so I'm going to us the old butt dyno. If that doesn't make a difference, I'll reset the ECU, give it a week to re-learn, and then go again on the butt dyno before going on to sensors.

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post #65 of 65 Old 08-30-2012, 03:45 PM
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Good luck with getting Brandon to respond, he's been absent more than you in the past year... Haha.
This is the first time reading your thread, weird how I always seem to miss these builds.
Anyway Brad, I hope you resolve the issue sooner than later. 75 dollar parts add up quick.

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