Quote:
Originally Posted by QFry
***This is just speculation***... The same thing happened to me at 230 miles. I hard reset the ECU, clearing the CEL. Just went to get gas and do a few test runs to see if it came back on...it did after 5 miles, but i noticed that the "lower" power band before the noticeable dip seems to disappear when the CEL comes on. makes since. Now being the genius i am (sarcasm), i decide to ignore the light and floor it just to see what was what and viola...the "upper" power band seemed to still be there (so much for limp mode...and i may have made a vtec joke)...
Is it possible that whatever Nissan/Subaru did to create that initial hump (i like to think of it as MAGIC) is causing the problems? Would this be able to show up on a dyno if one was done while the CEL was/is on? (this is still assuming that my cars condition is the same as this...)
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The cam timing in the high rpm range is similar to the idle/low load timing. The intake cam is on full retard. Makes sense that when CEL comes on it will keep the cams there, to intentionally reduce available torque.
If the cams were indeed stuck in a slightly "wrong" position causing overlap and hence bad idle, that would be less of a problem at higher engine speed.