I recently put my engine back in my 91 Z (305TPI)after all the gaskets were replaced. I finally got it in and ajusted the timing and now i have 2 trouble codes 42,43 showing. I know what they mean, and read them but i dont' know what the cause is from. I drove my car and it is real sluggish and has very bad throttle response. What could be causing this? Also I have tranny problems. I ordered a new clutch a pressure plate and throwout bearing as a kit. I recieved the kit but the pressure plate was the wrong size so i needed to get my car out of the shop that day so i just put the new clutch and throwout bearing in and reused the old pressure plate. Now when i start my car in 1st gear with clutch to the floor, my car starts to creep. It won't let me go into any gear, like it isn't disengaging. I just barely let the clutch out and it starts to move. I forgot to mention that i blew out my slave cylinder and put it back together, hope it doesn't leak(hasn't yet) but all the fluid ran out. I filled it and let the pressure build back up. Could that be the cause? Do i have to bleed the system or somthing? I don't know what else to do. any advice will be helpfull. thanks

 

91Z,

One problem at a time:

Your error codes are EST/ESC related -

DTC 42 - EST circuit grounded (HEI module failure)

DTC 43 - ESC control failure, spark retard too long


The '42' could easily be caausing the '43'. Check the HEI amplifier/switch module and its wiring.

As for the creeping clutch, yes, you really need to bleed the clutch slave cylinder before it will operate correctly. Bleeding it can be a cumbersome task, since the system doesn't really have the bleeder at the highest point of elevation. Any entrapped air will fight you all the way.

 

I recently re-sealed everything from the manifold gaskets up because the manifold was leaking and I needed to re-place the EGR valve, but anyway at the end of the project I had a 42 code and it was because I forgot to re-connect the EST wire that needs to be disconnected for timing setting. It's right in front of the heater blower motor, just in case you didn't know.

 

thanks for the reply's, i will have to check out the EST wire, i might have forgot to re-connect it but doub it. worth a try though. I think i might have forgot to connect my knock senser, might that be the cause of the trouble codes? And as for the bleeding, how and where is the bleeder valve? I have a haynes repair manual and it doesn't mention anything about bleeding. I am clueless as to how to do it. I will have to also check the HEI Amplifier, what should i look for that might give me a clue if that is the problem?? Sorry for all the questions but i am pretty clueless as to what to do. thanks again
Kyle

 

91,

An unplugged or failed detonation sensor could casue the '43', but shouldn't cause the '42'. It certainly is worth checking, since it may solve at least part of the problem.

As for the HEI, inspect all the wiring for breaks, grounding, shorting, and good connections. This includes the ignition coil and ESC module wiring, although if the car is indeed a 1991, the ESC functions should be within the ECM instead of a separate module. Don;t forget the detonation sensor, coil itself, and ECM wiring and grounds.

The clutch slave cylinder may not have a bleeder valve, and you may be resigned to cracking the hydraulic line fitting loose to bleed air from the system. 'P' cars have a bleeder valve, just like on the brakes, but I've heard most 'F' cars don't have the bleeder screw.