Got some coolness everyone might like. This is a local EVO owners car during a misfire but at WOT. His car is an 03 but he recently swapped to a 05 ecu. Problem still there, guess it's not the cars ecu making the problem but maybe a sensor feeding the ECU information. He said it clears up when he resets the ECU.

Check it out, RPMS break up, AFR goes from 10.5:1 to almost 13:1, timing stays flat, MAF HZ drops, Boost drops, Duty cycle drops.

Guess what other event happens on the evo that does almost the same thing and win a prize. :wink:

 

This is interesting, but my P0300 Never (yup, Never) happened above 2,000 RPM.
Keep us posted

 

fuel cut?

 

does this car by chance have an after-market intake?

 

WORKS drop-in filter in stock airbox.

 

Ok I think I got it.. but that is the prize? :P

 

BOV leaking?

 

What do you think it is?

 

A reflash! Right?

 

hahahah.

 

So is it right or wrong?

 

ok, what else cuts fuel and spark?

 

well knock would retard timing and in your case timing remained constant -- hrmmm. And the rev range isn't high enough for the rev limiter...

i'd guess he hit boost cut. Boost ramped up too high and too fast for the factory ecu and cut fuel and spark?

 

bing bing, cut fuel and spark... like the rev limiter. So it must be ignition related. We are going to check his crank and cam sensors and coilpacks.

Can't be fuel cut from too high boost, look at his MAF HZ.

 

Well i had a buddy here recently that had a problem with his coil pack but it was water related...heh. The car would idle and run fine until some water got on the coils. We just took a water bottle and sprayed the coils and watched the car stumble all over the place.

let us know what you find!