misfire goes away under boost?

[325DR]

Well my misfire problem has me stumped. I checked just about everything I could (plug wires, plugs, coil pack, module, cam sensor, MAF sensor, TPS sensor, grounds, etc. etc.) I took my car for a ride today and the misfire will happen at part throttle when the car is NOT under boost. As soon as the car sees boost, it goes away. I dont have a fuel pressure gauge on the windshield, but I do under the hood on the rail. I cant see WOT FP because I cant see the gauge. Any suggestions??

 

[Russ Merritt]

Check the injector harness connections, do a compression check! Any knock retard under boost?

 

[325DR]

KR is minimal. I might get 1.2 on the 2-3 shift, but thats it. Right now, I have a bad O2 sensor in so I dont have accurate WOT O2's.

 

[Mr URL]

You at least know one problem you still have -- bad O2 sensor. Replace it.