Ok, I finally got the car scanned.
P0122-Throttle/Pedal Position Sensor/Switch "A" Circuit Low Input
p1122-TP Sensor Voltage Intermittently Low
p1652-Vehicle Speed Sensor (VSS) Output Circuit
p1667-I think this one was something about fuel pump intermittently low voltage, but I am finding Reverse Inhibit Solenoid Control Circuit

The car sputters, backfires now, dies at 2000rpms for a second or 2 and the throttle position reads 0% no matter what. The Bank1 O2 sensor reads at 430-680 bouncing around a lot while bank2 stays around 415-440. The engine load on the scanner said 100% at idle as well.

http://web.camaross.com/forums/showthread.php?t=472791
http://web.camaross.com/forums/showthread.php?t=473475

these are my previous posts w/ what was happening then. The backfiring started today after I put all the plug wires back on and opti connections back on.

anyone ?? I have read now that 2 of those codes sound like dead PCM... I just got the pcm back from madz28 and dont think that is it, but if that will fix it I will ship it to him right now.

 

The first thing to fix would be the TPS, IMO.

 

Just use Shoebox's LT1-specific list:

P0122 = Throttle Position (TP) sensor circuit low voltage
P1122 = Throttle Position (TP) sensor circuit intermittent low voltage
P1652 = Vehicle Speed Sensor (VSS) Output Circuit
P1667 = Reverse inhibit solenoid control circuit

Start by locating the problem on the throttle position sensor. That's easy enough to check with a scanner or a voltmeter. If the problem is intermittent, check the harness connector for damage.

Your earlier posts indicated you had no codes at all, but you still had the 2000rpm flat spot. Since these codes have now showed up, but the problem is still the same, not likely they are causing the problem. Have you run the car with the tranny connectors (VSS, reverse lockout) disconnected?

 

wow, yes I did run the car w/ the reverse lockout disconnected, but I have disconnected the battery since then and figured it would have cleared. I did scan after the reverse lockout was plugged in and it had no code. We checked the connections on the PCM and there arent any pulled out or any damage to any of them. The wire to the TP sensor reads .06 volts. What does this imply?

 

It implies your TPS sensor (or the wiring) is screwed up.

At closed throttle, the TPS sensor must read at least 0.20V, or the PCM sets the low voltage code. Any voltage between 0.20-0.90V is OK at closed throttle. As you smoothly rotate the blades open, the TPS volts should increase smoothly from the closed throttle voltage to about 4.0V higher at WOT (higher than the closed voltage).

 

Ok, could it be the sensor if it is reading .03v for the green and black, and .02-.15 for the black and blue cable. Doesnt this mean it isnt getting the proper inputs to work properly? or is this due to resistance in the sensor? I can always go get the sensor real quick if it might fix it.. but I guess it is probably the wiring, I am about to get down there and see if anything is frayed.

 

so since the voltage is so low doesnt that mean it cant be the sensor? To me it seems it has to be the wiring/pcm.. thanks for replies

 

The TPS sensor has 3 wires. Black is ground, gray is +5V reference from the PCM. Blue is the signal wire. Measure the voltage between gray and black to make sure it has +5V. Measure the voltage between blue and black to get the signal voltage. 0.03V is too low. But there is no green wire.

 

I must have gotten grey mixed up with green. So the 5V reference reads .06, doesnt this mean the signal isnt being sent properly from the PCM? (or a wire is burnt/shorted out). The wires are just on top of the motor for that link and there is no problems w/ them as far as I can tell.

 

The PCM sends 5V to the sensor on the gray and black wires. The throttle shaft moves a pickup along a rheostat coil. The Gray/black wires have to have 5V on them or it won't work. Pull the harness connector off and probe the gray to black voltage with the key on. If you don't get 5V, probe from the gray wire to a good chassis ground. If you still don't have 5V, try and access pin B6 (black wire) on the PCM and make sure there is a ground. Then try pin B28 to make sure its supplying 5V. That will tell you if its a sensor problem, a wiring problem or a PCM problem.

 

Ok, on the pcm B6 reads 0v and b28 reads 5v. This means the pcm is sending the 5v signal and the wiring is the problem correct?

thanks a bunch for the info injuneer, I will probably just run my own wire this weekend and see what changes!!

thank you so much

 

I just had a similar issue on my 94LT1 M6. The MAP sensor 5V supply wire was intermittently shorting to ground, which was taking out the 5V supply from B28 and B29.
I hope you found your problem, mine sure drove me nuts for awhile...