I have a 302 Ford (Australian motor from an XR8 AUIII Falcon) in my RCR40 which has an issue that occurs only when revs rise above 4000 (approx). This occurs every time, and beyond 4000 rpm the acceleration drops off dramatically and revs rise very slowly.
I have a fuel pressure gauge in the line and have confirmed that the fuel pressure stays consistent at 39-40 psi, below and above 4000 rpm under load. I also connected a friends air/fuel mixture gauge expecting a lean out condition, however this did not occur and mixture looked OK, a bit rich at lower RPM.
Other things I have performed are;
Cleaned MAF
Checked correct operation of throttle Pos sensor
New Spark Plugs
New Leads
Checked Injector resistance is consistent across all injectors
Checked Compression was consistent across all cylinders
Engine is unmodified and came from a wreck. ECU was provided with engine and has a J3 daughter board connected to remove unwanted inputs like auto trans, immobilisers and other irrelevant things.
Any thoughts or suggested further tests to help diagnose?
Thanks
Colin
I have a fuel pressure gauge in the line and have confirmed that the fuel pressure stays consistent at 39-40 psi, below and above 4000 rpm under load. I also connected a friends air/fuel mixture gauge expecting a lean out condition, however this did not occur and mixture looked OK, a bit rich at lower RPM.
Other things I have performed are;
Cleaned MAF
Checked correct operation of throttle Pos sensor
New Spark Plugs
New Leads
Checked Injector resistance is consistent across all injectors
Checked Compression was consistent across all cylinders
Engine is unmodified and came from a wreck. ECU was provided with engine and has a J3 daughter board connected to remove unwanted inputs like auto trans, immobilisers and other irrelevant things.
Any thoughts or suggested further tests to help diagnose?
Thanks
Colin