Allright... 89GTU K&N, cold air duct, no cats-Bonez race pipe, Racing beat catback.....

She runs good up 'till 7k and then the power drops off radically...... didn't do that before i opened her up....

Spark plugs had a really light tan coating on the ends when i changed them last week (this meant "lean" when i was running two stroke M/C's)

Also... seems to run better at 4/5 trottle than FWO.

Planning on checking these things

1) ECU Codes (duh)
2) Fuel Pressure
3) A/F ratio with a wideband (when I can find one!)

Anybody else run into this???? Suspect problems?????

I'm open to suggestions!!!

Anybody have a link to how to PROPERLY set the TPS on an 89-91??

 

Go to www.teamfc3s.com and look at the FCM for your year car...doesnt get anymore proper thatn the FCM.

Factory Service Manual incase you didnt know, all you needs is Adobe to open them...there free.

 

Dont remember where max hp is made I think 6800. There is no need to be above 7k on a stock port engine.