power begins loss at 4000 RPMs-help!
Chasing the issue w/ my 88 911 down for a while now. Replaced O2Sens, Head Temp Sens, full tune-up, tested air flow sens, coil, fuel pres... all passed. When I tested speed and ref sens 1+3 showed good, just showed open circuit when testing the other pin combos???? anyone familiar w/ this?
BTW runs/revs/drives perfectly 'til 4K rpms whether under load or not. Always gets rough at 4K in any gear.
Any all suggetions welcome.
Chris
88 Carrera
99 Boxster
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Coz
88 911
72 914-6 Vintage Racer
76 914-6 Vintage Racer
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