Figured I's share my final as 08 Redline is fixed:
Finally running solid.
Problem.....lousy $40 fuel pressure reg....little sensor in the left hand side of the fuel log.
Just to share what I learned....and I'm sure that many of you are way ahead of me on this:
Fired the new ZZP motor. Inadvertently did this with the high pressure fuel pump solenoid connector disconnected. Motor actually ran fairly well...but set code 0087 and 'reduced power' light on on dash. Once I plugged the pump in, engine died immediately. Car can obviously run in limp mode. Low pressure pump in tank shows 62-70psi at idle....swings wildly 60-80 when running on LP pressure gauge when running(schrader valve prior to log).
Stupid move....bought a new pump which did nothing....mind you the old pump was mine and ran fine last fall. (as was the sensor so I have no good explanation for it's failure.)
Pulled my hair out looking for the problem. GM manual contradicts itself, but the 2 wire connector is a simple + - solenoid control. When the circuit is live, you should measure batt voltage on the + side and ground on the neg. Strangely, I always measured 3.5-3.7 volts at ground. (GM claims in two different lines both that + should pulse to control how much of the pump stroke is used later telling us that the neg should pulse. I believe that the neg is right. Either way...a cheap test light across both terminals toward the computer should show the light flashing when the engine is running. ) mine wasn't.
The high pressure sensor on the fuel log has 3 small white wires off of it. Computer ground and digital positve (5vdc) are at the outer ends...the middle wire voltage should fluctuate depending on log pressure. Not sure of a good reading but I would imagine from close to 0 at low pressure to close to 5vdc at high...and this log can be at 1800psi+. Mine wasn't fluctuating...sitting at about .470vdc.
All's well that ends well I guess.
That being said, regarding ZZP....yes...can't beat the price. I got new turbo new exhaust manifold ect. really wasn't crazy with their responses to me. PS None of my problems were from them. Their mechanic did leave my high pressure line to the turbo loose in the LNF head swap causing my $6/qt break in oil to piss all over my floor. Sloppy work at the very least. I got their LDK block equipped with LNF head. Again....the turbo sat higher which caused my exhaust tips to sit low. Had to butcher the brace brackets to extend them 1/2 inch. Could have been a different manifold than my old but used my original intake on the other side which also sat 1/2 inch too high and had to butcher the brace brackets on that side also. I never measured to see what was wrong....and truth be told, I used the new brace brackets they gave me rather than my own.
Thank you all for the advice.
Now I have to figure out why the ignition key is stuck!!
Got a happy woman at home anyway.
Tom
