Hi All.
Bought a very tidy KN a few months ago. 1600 DOHC ZM.
Seemed to perform well on the highway; a bit slow on long uphills ... yeah - OK - not a turbo or V8.
BUT ... one day (after freezing outside in a couple of zero degree nights) ... it began to absolutely fly up the same hills ... like it suddenly found another 20kW. OMG. }}}:-O
A few weeks later it was back to crawling over the top of same hills at 80. Grrrr.
Hmmm ... dig dig dig ... engine has an MTIS system = for inducing intake air swirl below 3000 rpm via a movable butterfly plate in each intake port, ganged together on a common spindle.
These plates are opened/closed via a vac operated pushrod actuator connected to this spindle..
Still with me?
OK - actuator must be a bit stuck (tech term). WD40 should fix.
I thought ...
Under engine with a flood light ... ... ... ... ?
What actuator? Nothing there resembling this pushrod actuator. ???
And no evidence of a full width butterfly spindle across all ports ... ?:-|
SOOO --- what is in there that can change to improve engine performance ... GRRRRRR.
Has there been some sort of a mid-production change?
Over to the KN KQ Grand Wizards ... :-D