To further complicate my problems with my car, this is getting very frustrating.

I have alot of timing retard problems, I sent the PCM into madz28 and Ion desesitized the knock retard tables. Got the PCM back, the retard numbers are better but still pulling up to 8 degrees(was pulling up to 16 degrees). Then I email Ion and madz28 and tell him what the problem is, and I order a NEW PCM from him and he zeroed out every knock retard table and sends this new PCM to me. I hook up the PCM, and it STILL IS PULLING TIMING, the same way it always did. It's pulling up to 8 degrees, mostly at part throttle, after the car is warmed up mostly. I email him back he says he can't do anything more and will send me a picture of the timing tables, I'm waiting on them. I'm about to take make a video of my scanmaster AND hypertech scanner showing the retard the car is pulling. I've spent over $225 on programming.

ANy help here, how can this be?!
I am totally clueless, I tried everything. Disabling knock sensor by resistors, disconnecting, buying a new one, then programing the PCM, then getting a new PCM with it programmed out. Still pulling timing.

help?!

Brian

 

What kinda setup are you running.. solid roller? Did you convert to an OBD1 computer and if so you did replace the knock sensor with the earlier 94-95 version right?

 

This is a 96Z, stock engine, stock 96 OBDII PCM, stock knock sensor. Car only has boltons. The knock sensor right now is currently hooked up but it's just dangling outside the block, but I don't see how that matters because the knock retard is zero'd out in the tables right??

If it is relevant click the following for all my mods:
http://home.comcast.net/~bhawalka/specsZ28.htm


Brian

 

So what happens if you unplug the sensor? You should see something like 15 degrees retard.

 

If i unplug the sensor it shouldn't matter since Ion zero'd out the knock retard tables in the PCM I'm assuming, why would it go to 15 degrees?? I'm going to mess around with it tomorrow if I can and it's not to cold or snowing, but like I said no matter what I did or tried it retards the timing the same way even with a PCM reprogram, wow.

 

Well the point I am trying to make is if you unplug the sensor and see the max 15 degrees being pulled at all times then that would tell me the reprogram didnt "take".

 

yeah I see your point, I can try it but I doubt anything will happen different. Thanks for the tip

 

Is it showing knock or the spark advance numbers aren't matching the tables? Maybe the retard vs coolant temp tables need adjusted also, just guessing. Do you have a uni file we could look at?

 

I'm sending the PCM back to the tuner to look at again, I will ask him for that uni file as well when I get it.

In the mean time, I will just have to check and double check my sensors and my knock sensor circuit.....

Brian