Evo IX - "Service Engine Soon" light blinking under heavy boost
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Evo IX - "Service Engine Soon" light blinking under heavy boost
Just like the title says. I don't feel any loss in power from the car, just the blinking "Service Engine Soon" light, and the light does not stay stagnate, it only blinks 3 or 4 times under heavy boost and then disapears as soon as i let my foot off the accelerator.
I had a mechanic run a diagnostics for any codes and he said he couldn't find any, so he was telling me it could be my lightweight flywheel causing the computer it to think it's over-revving but that didn't sound right...but i could be wrong
Another variable is that I was tuned on E-85 for a long while and was recently tuned back to 91 for convenience reasons within the last week and a half and have filled up twice on 91 since then, and on my most recent fill-up I added a fuel additive (don't know if that has anything to do with it)
Anyone have any idea what this might be?
I had a mechanic run a diagnostics for any codes and he said he couldn't find any, so he was telling me it could be my lightweight flywheel causing the computer it to think it's over-revving but that didn't sound right...but i could be wrong
Another variable is that I was tuned on E-85 for a long while and was recently tuned back to 91 for convenience reasons within the last week and a half and have filled up twice on 91 since then, and on my most recent fill-up I added a fuel additive (don't know if that has anything to do with it)
Anyone have any idea what this might be?
Last edited by AlisterMcRae; Aug 3, 2011 at 02:00 AM.
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Just like the title says. I don't feel any loss in power from the car, just the blinking "Service Engine Soon" light, and the light does not stay stagnate, it only blinks 3 or 4 times under heavy boost and then disapears as soon as i let my foot off the accelerator.
I had a mechanic run a diagnostics for any codes and he said he couldn't find any, so he was telling me it could be my lightweight flywheel causing the computer it to think it's over-revving but that didn't sound right...but i could be wrong
Another variable is that I was tuned on E-85 for a long while and was recently tuned back to 91 for convenience reasons within the last week and a half and have filled up twice on 91 since then, and on my most recent fill-up I added a fuel additive (don't know if that has anything to do with it)
Anyone have any idea what this might be?
I had a mechanic run a diagnostics for any codes and he said he couldn't find any, so he was telling me it could be my lightweight flywheel causing the computer it to think it's over-revving but that didn't sound right...but i could be wrong
Another variable is that I was tuned on E-85 for a long while and was recently tuned back to 91 for convenience reasons within the last week and a half and have filled up twice on 91 since then, and on my most recent fill-up I added a fuel additive (don't know if that has anything to do with it)
Anyone have any idea what this might be?
Like everyone else said, it's definitely the flash on knock function found in the Tephra ROMs.
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To the OP:
99% of all stock ECU tuned Evo's run what is called "TephraMod." I would be willing to bet money this is what your car is flashed with. TephraMod has an option where it will blink the check engine light when knock is detected, and pull timing to save the motor. If your tuner has the timing too aggressive for a 91 octane tune, then there would certainly be knock at high load and the light would blink.
Take your car back to your tuner and tell them you need it fixed. Or there are also a host of tuners here on the forums who can do email tunes if you have the correct cable.
-Acree
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Just an update, I talked to the guy who originally tuned the car (not the idiot mechanic) and he informed me that it was a feature he put in the ROM to let me know when it sees knock. He said there is slow flash knock (3 counts or less) and the fast flash (5 counts and up). He said it's probably due to the result of heat soak because of the temps and humidity we have been having in Arizona lately and of course 91 octane pump gas.
He said that if I am doing the same pull and the knock is consistant, then just swing by and he would fix it until winter rolled around.
He said that if I am doing the same pull and the knock is consistant, then just swing by and he would fix it until winter rolled around.
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Just an update, I talked to the guy who originally tuned the car (not the idiot mechanic) and he informed me that it was a feature he put in the ROM to let me know when it sees knock. He said there is slow flash knock (3 counts or less) and the fast flash (5 counts and up). He said it's probably due to the result of heat soak because of the temps and humidity we have been having in Arizona lately and of course 91 octane pump gas.
He said that if I am doing the same pull and the knock is consistant, then just swing by and he would fix it until winter rolled around.
He said that if I am doing the same pull and the knock is consistant, then just swing by and he would fix it until winter rolled around.
Just my opinion...