i got a 91 civic si with a B18b engine. i just found out that i have been running my stock PM6 ecu with the ls engine for 2 years. ever since i had the swap i've had this weird o2 problem, so what ecu's do you run a b18a/b in a 88-91 civic? also how do you tell the diffrance between the obd0 pr4 and the obd1 pr4? thanks

 

You want a 90-91 Integra PR4 ecu. Do a search, should be plenty of info around. OBD-O ECU's (the one you want) have large whitish and black connectors, while OBD-I are grey with more wires.

 

now how would the PM6 ecu even run the Ls? i have bogging, surging problems, havent been able to keep a stable idle for the past 3 years also. and after driving a bit my cel comes on, but then i turn the key off it goes away for a while. the ecu just flashes code one. these would be symptoms of running the pm6 ecu correct? thanks

 

The Pm6 will run it, it will just run like a dog. 1.6 sohc fuel and timing maps for a 1.8 litre dohc... see the problem??? Just replace it and see what happens.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by S13 slide &raquo;</TD></TR><TR><TD CLASS="quote">after driving a bit my cel comes on, but then i turn the key off it goes away for a while. the ecu just flashes code one. </TD></TR></TABLE>

It might be a hard code, meaning that you have to unplug the POS. from the Batt. for 5-10 min(just to be safe) and then hook it up again. Sometimes all you have to do is take the ECU fuse out, but some codes will come back until you take off the batt. terminal.

 

i've pulled it numberous times to try and reset th ecu. i have a obd0 pr4 ecu on the way so we'll see what happens... thanks for the info

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by S13 slide &raquo;</TD></TR><TR><TD CLASS="quote">the ecu just flashes code one. </TD></TR></TABLE>

Just FYI if you did not know,

Code 1 Accord Civic CRV CRX Del Sol Odyssey Prelude
85-98 86-98 97-98 85-91 93-97 95-98 85-98
Oxygen Sensor "A" (Primary)
defective circuit or unplugged / defective sensor


Have you checked the O2 sensor?