Evo 9 Detonation
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Joined: Feb 2015
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From: Odessa
Evo 9 Detonation
Hi guys, have some issue with Evo 9, and tired to fight with it.
The issue start long time ago, it was stuttering during acceleration, sometimes the was feeling like you hit a wall during acceleration. The tuner did't find a problem, I changed plugs (gap is 0.5 mm), fuel pump, before was walbro 250 now it's AEM 320 but problem didn't gone. Then we rewired fuel pump, but also didn't help, symptoms are back. This summer I called the tuner, and we made retune of ECU on dyno, the fun thing that during tune the was no any issue, acceleration smooth, no detonation. I was driving less than a week, and symptoms start come back. Then I found a thread about stuttering, and some guy was telling that he changed the MAF and the problem gone. Next day I went and did MAF cleaning, and stuttering is gone. But the detonation is still has place to be. I don't have AFR gauge, but for sure during tuning AFR was ok. Also, I try to bypass fuel solenoid, but no any changes. The service shrugs shoulder and don't wont to solve the problem. Tired to see CEL flashing, don't know where to look.
Any advice guys?
The issue start long time ago, it was stuttering during acceleration, sometimes the was feeling like you hit a wall during acceleration. The tuner did't find a problem, I changed plugs (gap is 0.5 mm), fuel pump, before was walbro 250 now it's AEM 320 but problem didn't gone. Then we rewired fuel pump, but also didn't help, symptoms are back. This summer I called the tuner, and we made retune of ECU on dyno, the fun thing that during tune the was no any issue, acceleration smooth, no detonation. I was driving less than a week, and symptoms start come back. Then I found a thread about stuttering, and some guy was telling that he changed the MAF and the problem gone. Next day I went and did MAF cleaning, and stuttering is gone. But the detonation is still has place to be. I don't have AFR gauge, but for sure during tuning AFR was ok. Also, I try to bypass fuel solenoid, but no any changes. The service shrugs shoulder and don't wont to solve the problem. Tired to see CEL flashing, don't know where to look.
Any advice guys?Last edited by EDDY PRIME; Nov 16, 2020 at 01:53 PM.
Thread Starter
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Joined: Feb 2015
Posts: 7
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From: Odessa
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Posts: 7
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From: Odessa
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