nomind

Okay....From the beginning of my issues. Went to start car thursday to leave work, and it as soon as I hit the key, it went dead. Figured out that it was a loose positive terminal, and got that fixed pretty easily. But after that, the car didn't run right. On the way home, it threw a code 33, and a 44. OE part was still on the car, so I replaced the MAF. As soon as I started the car after that, it was running so rich that it hurt my eyes. Via process of elimination, it was determined that the CTS was bad (basically showed 0 when testing). CTS, and IAT were replaced. Was also doing a tune up, and manage to destroy the connectors in the distributor, so it was replaced. The car was timed to 6* with the brown wire disconnected. Its also gotten new plugs (the ones that came out looked pretty normal). On the way to work this morning, it threw a code 22, and a code 44. Checked the wiring for the TPS while I was at work, and on the way home, the light comes on again, this time a code 21, and code 44. If I drive the car at cruising speed, it starts to miss, and buck. If I put the engine under load, it stops. I've set minimum air, and the car doesn't want to stay running under 550 with the IAC unplugged, so I left it about there. Then I set the TPS to .54, and checked the sweep on it. Goes pretty smoothly up to about 5.09 volts. I don't have a cable to scan with, so I'm trying to figure out where to look next.

TL;DR:
Distributor, IAT, CTS, MAF, cap, rotor, plugs have been changed. Min air, and TPS set, timing at 6*. Car threw a 22 on the way to work, checked wiring, car threw a 21 on the way home. Any ideas?

nomind

Guess I could add:

21 - High voltage at TPS
22 - Low voltage at TPS
44 - O2 sensor lean

vetteoz

iTrader: (13)

Since the TPS appears to work correctly and you have codes for both hi and low readings I would be checking the TPS wiring back to the ECM for faults

Either code will present with a wiring fault
Work through the TPS diagnostics

http://www.chevythunder.com/tps_code_21.htm
http://www.chevythunder.com/tps_code_22.htm

KrisW

iTrader: (5)

I just picked up an 85 Trans Am with TPI (non runner in a barn) so I'm following along.

Tuned Performance

iTrader: (92)

also check the ground on the back of the passengers side cylinder head as well. If the tps voltage is correct on the feedback blue wire you may consider upgrading the 1226870 ecm to the 1227165 ecm.

nomind

Okay, so I go out to start the diagnosis for the TPS codes. Check the TPS again before I start, just because. Its normal, closed output is .55, full throttle is 5.09 volts. I start the car to let it warm up (all the diagnostics are with car war), and I look at the TPS voltages again, normal. After it starts warming up, I started checking all the connectors, IAC, etc. I grabbed the wiring for the MAF, and the idle changes, and it starts running pig rich again. I shut the car down, and pull the plug for the MAF. The bottom connector (red wire) doesn't look exactly like the others, its been compressed, so I grab something, and bend it back up. Plug it back in, and start the car. The idle smooths out, and it stops running so rich. Take it out for a drive, and its running like its supposed to, except for one thing. When I step on the clutch, the RPMs hang at about 1500 or so, unless I let it sit for about a minute. Then the RPMs drop back down to a reasonable 750-900 range. I'm starting to think I need to go through and replace a few of the weatherpak connectors in the engine bay. Lots of them are missing clips, or are in worse shape than that.

vetteoz

iTrader: (13)

Sounds like a plan

If you read the FSM ,you will see some codes are interrelated to other systems
If say ;the MAF reading is X then the ECM expects to see a reading of Y on the TPS, ( like the throttle has to be open a certain % for a certain amount of air to flow ) .
If the MAF is wrongly showing X while the TPS is showing Z then the ECM says something is wrong as it is not what it expects to see