[DoctorDex]

Originally Posted by ProwlerGT

-Bad o2 (oxygen) sensors

I have a new (~10000 miles on it) rear O2 sensor. Replaced it because it was a bit lazy. Now both my front and rear o2's cycle pretty much identically. The both cycle quickly and there are nice sharps peaks to their graphs.

Originally Posted by ProwlerGT

-Exhaust leak

Have taken it to an exhaust shop and had them look over everything. They couldn't find a leak. They'd use a long length of hose, a bit like a stethoscope, to listen over a suspect area. No leaks.

Originally Posted by ProwlerGT

-Very dirty lower plenum

Mines clean. The meth kit helps with this.

Originally Posted by ProwlerGT

-Very dirty plugs

I have fresh plugs (< 3000 miles on them). The old ones were clean and had a nice tan colour to them.

Originally Posted by ProwlerGT

-Disassemble everything that has an air seal; reseal all with new gaskets and rtv

I've pressure tested to 22 psi, no leaks.

Originally Posted by ProwlerGT

Tried putting back the stock MAF?

Haven't done this, but it would be a major PITA. Had this problem before switching to a GM MAF, so I'm doubtful this would work.

Originally Posted by ProwlerGT

Are the iron results in your oil analysis suspicious? 20ppm

The iron is a little bit on the high side. I think its probably the result of the low load knock I occasionally see in the 2600 - 3000 rpm range, or it might be related to the ticking I have coming from my rear valve cover. To have a ticking, like I do, there must be metal hitting on metal somewhere. ? Lifter colliding with rocker?

Originally Posted by ProwlerGT

Suspect a/c compressor is dragging the engine

Possible, I plan on looking into this.

Originally Posted by ProwlerGT

How modded are you? Enough to justify .028 plug gap?[/b]

I'm running 22 psi on a daily basis. Since buying a DLI, I could probably increase my gap, just haven't got around to it. Plus, its nice having a bit of blowout "insurance".

Thanks for the suggestions. I think the most logical sequence of events for me would be to try and test my ECU in my friends car (can't ever get a hold of him). I think he's worried my ecu will screw up his car. Then I'd like to get a hold of an oscilloscope to see what the injector/CAS waveforms are looking like throughout the rpm range.