need help on diagnose a single misfire - Miata Turbo Forum -Boost cars, acquire cats.

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Old 01-13-2010, 04:22 PM   #1
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Default need help on diagnose a single misfire

I data logged last week while on track. whole session - 15 minutes worth.

while in middle of straights (6 seconds straight, 3 second into it), it would misfire for 1/4 second (this is the resolution of data log). TPS would show 0, MAP would drop ~1/2, fuel injected show ~1/4. this happens consistently at all straights.

I am going through the thought process as what it might be. a bad TPS ? then does fuel get cut based on TPS ? is it possible that the whole engine harness is getting a short ? if so, won't fuel go to zero also ?

help me through the thought process. I am a complete noob with ECU.
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Old 01-14-2010, 10:59 AM   #2
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I'll send a log to Adaptronic about it, but this seems to be isolated to you. I've never had a problem while at WOT. Can you send me yoru map so I can take a look for you?

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