I believe your map and TPS are on the same ground circuit aswell as your 5volts reference wires(the gray ones) from the PCM. black connector B28-B29 are fused together inside the PCM. Your map seems high. I guess it depends on your Altitude though. Have you used a DVM and checked the reference wires yet? I had a simular issue a while back. My Map was also reading high when my TPS was off. The car ran very lean or off the scale Fat. TPS is alot more sensitive than the MAP though. Turned out I had a short in my 5volts reference wires. So I soldered new wires direct from the PCM connector to the sensors.

Looking at your LOG4 file, at 100% throttle you max at 4.04 volts. You should be at 5 volts. Your losing voltage from your PCM to the sensor. Or the sensor itself. Record 829-832.

Where are your Short and Longterms at on your logged files??
Or am I just Blind. I guess your PCM farted on log4 record 4064.
Thats really weird man.

Thanks Brent. My Map was at about 60kpa, and then after i degreed the cam ,and advanced it to where it needs to be. The MAP went up to about 68ish at idle. I haven't checked the reference wires yet. Are you saying i need to test each reference wire for 5 volts? I appreciate the ideas and info. I'm looking for anything to look into now.

I also looked at the PCM ground yesterday when i was home. The ground wire was half broke and turning green and covered in crud. I repaired the wire and removed the stud and ground all the paint of the block. I then cleaned the stud and the area of the block and put it back in. I won't have a laptop until this weekend to see if that fixed the connection errors, but i still think i have something effecting the voltage.

Ya, just unplug the connector to the TPS and You should have a gray, black and I believe a blue wire as the signal back to the PCM. The gray wire is the 5volt reference from the PCM. The Black wire is the ground to the sensor. Take a DVM and measure the voltage on the gray wire, except, ground the DVM to the battery 1st. Check voltage. Then try the same thing but use the DVM ground on the black wire of the TPS connector and tell me what you get?

If you get 5 volts then your TPS sensor is bad, or you have a inermittent wiring problem. You can check this next procedure with out Data master. Ground the DVM to the black wire on the connector and test the voltage of the blue wire with the engine off and the ingnition on. Now open the throttle all the way. Does it measure 5 volts? If not you have a faulty TPS sensor.

Yeah but was it the PCM or was it something else. Since we used 2 seperate PCMs and they acted nearly identical.. that makes me think something else is happening.

The TPS sensor is good because its the one off of MY car. Last summer we switched them out after I believed it was a faulty TPS sensor.... didnt change a thing.

Keep em coming though.

Basically I am down to 3 causes. Either select input data is getting scrambled, select output data is getting scrambled(maybe combo of both) or there is a system-wide problem which is affecting the entire PCM... of course that wouldnt explain why only certain sensors are affected as opposed to ALL of them.

My main problem is I dont know how to go about differentiating cause and effect.

Brent you said the MAP and TPS are on the same ground circuit, do you know where the ground wire is? Is it the same one for the pcm that goes down to the block down by the knock sensor or is it one of those that are mounted on the shock tower by the pcm. I really appreciate the ideas and input Brent. This is driving me nuts and just makes me want to sell the damn car.

I feel your pain. Ive been in the same shoes and still am. Im have a code 16 issue that I think the wiring is the issue. Ive had wiring issues on top of other ones. If it comes down to it, Im gonna just replace my entire engine harness.
I believe the map and TPS work off of circuit 452 which is a PCM ground. Its a black wire in pcm connector BLACK B-16. You can trace it.
As for that fowl up on the log4. I think its a wiring issue. Im not sure about this but I believe the PCM actually needs a minumum of 12.8 volts to function properly. You may have a short somewhere thats really pulling the voltage down.

If the TPS is fine, more than likely you have a some serious restriction in your reference wires to lose a volt.

I'm pretty sure the TPS is fine. I just need to find out whats killing the voltage. I sure wish i knew where to look for this short or how to really look for it. Turbo_z is gonna come back and bring his volt meter but any suggestions on where to really look for a short. I plan on testing the tps wiring like you said but any other suggestions to look for the voltage drop. Turbo also has an old engine harness out of a 95 Caprice that we could steal parts off of if we need to.

Have you datalogged since you fixed the pcm ground?

No not yet. I will probably tonight. Turbo_z is the only one of us with a laptop. I bought one but its taking forever to get here.

We hooked up the scanmaster and i keep getting data read errors. I did the TPS test you listed Brent. The one where you check the reference voltage, it was the same when i grounded it to the battery as well as the ground wire. I'm sure the tps can't be bad. Me and turbo have swapped it out before.

I wanna add that yesterday I noticed in the log we did that his TPS was 4.61 volts with 100% from 2000-6000 rpm in 1st gear but when he hit 2nd is when the voltage started to drop off till he let off. Odd how its fine in 1st gear but not in 2nd and I assume all the rest of the gears.