Quote:
Originally Posted by thstone
A flat spot at 6K rpm is definitely not normal. And rarely (never?) will a performance modification eliminate a foundational problem (more often than not, the upgrade exacerbates the problem).
Check the ECU for any codes (like a misfire) that may have been detected but did not illuminate the CEL. After that you'll have to do some detective work to sort through the usual suspects like plugs, fuel filter, air filter, fuel pump, coil packs, MAF, etc. to find the culprit.
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No codes stored, engine runs fine 99.8% of time, and most stuff you mentioned are replaced last year within n the last 8K miles, except fuel pump and coils likely original at 77Knmiles. It is just slight hint of around 6,000rpm for fraction of a second before it continues to rev into red, so I do not think fuel starvation or ignition coils.
I agree that upgrading won't make sense until you fix whatever wrong first, I guess I'm just thinking if this momentary flat is more like by design?
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