Ok i have a z6 in my hatch. It's all converted to obd1. Well it won't rev past 4k. I changed the ecu,tps,map,iacv,still didn't help. I'm not running an o2 sensor. But that shouldn't cause this problem. I'm running obd2 injectors.. someone help..

 

lol.
unless your obd1 ecu is chipped and running open loop, it will go into limp mode if it can't 'see' an o2 sensor.

 

yes like wmac said get your ecu chiped and check it that way, same problem happend to a buddy, let him use my ecu and its golden. or try to run an o2 and see what happens(if yo have the parts to do so)

 

Why are you NOT running an O2 sensor? And why do people know all the time what the problem isn't? Looks like you spent a lot of time and money finding out what it also isn't. Is it throwing a CEL?

 

deff the o2 sensor

 

i have a chipped p28. i disabled the o2 in crome and still had the problem..im not running an o2 because i have a wideband and im poor..

 

Get it tuned...