98z28bitcha

iTrader: (22)

Hello everyone,

I have a problem with my z28. One thing it will not go into closed loop it try's but at soon it hits closed loop the cars dies. So keeping it in open loop it feels like it's not right. Rev it sounds like a cylinder is not firing right. I am going to replace the crank sensor and relrean the PCM to see if fixs it. If not I don't what it is. I repin the harness from the 98 for a 02 PCM and check the harness a couple times to see if I miss a pin everything checkouts. So here is my question, does the vin need to much the bcm for vats? Also when I got it running in open loop to take it to be tune. the car shut off on the dyno and when it shut off the laptop loss connection to the PCM. Right now I don't know if it's the PCM or something esle. Thanks in advance!

Rob

flame

iTrader: (13)

Has it been tuned for the injectors? If not start there

98z28bitcha

iTrader: (22)

It has been tune for injectors.

flame

iTrader: (13)

If it ran fine before the pcm swap then you have three things : wiring, pcm, tune. If it ran crappy before too then its anybody's guess.

98z28bitcha

iTrader: (22)

I hate throwing parts at it but what I can do. Well I am going to pick up a crank sensor to see if that helps and hopefully I don't have 2 relearn.

bigboykilroy

iTrader: (48)

Go back through your wiring make 100% sure that each wire matches up, its sooo easy to mis pin.
I have code sheets if you want to verify again.
Go one wire at a time block by block.

98z28bitcha

iTrader: (22)

Ill go through it again but I am 99.9% it's not the harness.

98z28bitcha

iTrader: (22)

But my question is does vin need to match the 98 bcm?

98z28bitcha

iTrader: (22)

Could u pm those to me.

bigboykilroy

iTrader: (48)

NO the BCM does not care about the new PCM.
Were did you get you new pcm from? Did they do the fuel seg swap for you?

98z28bitcha

iTrader: (22)

Thanks I Can cross that off my list. I got it from a member here and he did the swap for me. Which I am thinking the PCM is bad or something is wrong with my tune.

98z28bitcha

iTrader: (22)

i got it from poconojoe who is now banned.

flame

iTrader: (13)

Did it run fine before the swap or are you doing the swap to try and fix something?

98z28bitcha

iTrader: (22)

It run fine befor the swap and right now the only thing is left to check and see if the PCM is bad.

bigboykilroy

iTrader: (48)

We have the following:
with 98 car ran fine.
swapped pcm and wiring now car does not run right.

Who moved you tune from the 98 to the new pcm?
I know joe just puts in a stock 2002 fbody file.

I know that joe tests them before he sends them, so i dont think its a bad pcm.
I can call him and im sure he will send you a 2nd pcm to test just to make 100% sure its not a bad pcm.
DO you have access to hp tuners?
If you do please start up a log then start the car and let it run.
I want to see what the pcm is seeing with the 02 sensors.
I have seen some wrong pinout sheets, i think you may have a miswiring issue.
Take 2 pictures, one of each pcm block, take off the protestors.
I want to see how its pinned out. Maybee we can see a miswire.
I will also send you today the sheets I use I have had 100% sucess with these, others i have seen are wrong.

bigboykilroy

iTrader: (48)

can you also post up your tune?
what injectors do you have?

98z28bitcha

iTrader: (22)

I'll get pics tonight and don't have hptuners. I have 42lb injectors.

bigboykilroy

iTrader: (48)

how did you tune for the injectors?

kevin kuether

iTrader: (1)

Any news or updates on this thread. I did the same swap and have the exact same problems with mine. Very frustrating.

CalEditor@PCMCalibrators

iTrader: (4)

It sound like the idle tables were not correctly adjusted for the cam.