Any one out there ever see this problem?
I have a 91 Si w/ OBDO b16a swap and PR3 ECU. Car recently started running rough during light throttle. It only seems to do so under 6K RPM. It will clear up here and there for a second or two then back to the same old crap. Here are the things I've tried so far.
Everything is wired correctly and swap was done several years ago.
Engine has good compression
Fuel pressure is good (tested w/ Snap-On Fuel Pressure Gauge at rail)
Replaced coil and ignitor (both honda)
plugs are in good shape
knock sensor working correctly (just a wild idea)
Cap and rotor new (honda)
Fuel filter new
Replaced Injectors
Valve adjustment good
Wires are Magnecore (Fairly new)
MAP sensor replaced (Known good honda)
Vacuum lines correct
Water temp sensor replaced
Ground points cleaned
No loose connections at engine or ECU
Not Main Relay

Car runs great from 6K up and under full throttle. The car also runs great for about 30 seconds after start up, regardless of engine temp.
Any thoughts would be appreciated
Shawn


Modified by Shawnsblacksi at 7:48 PM 6/16/2006

 

switch your 02 sensor wires see if that helps..they might plug in correctly but reverse them same thing happened to me when i had my crx with obd0 b16..

 

only have one o2, wires jumped at ECU and that connection is good.

Sorry, can only make 5 posts a day, so I had to modify this one. I have a DC Sports header that has one o2 bung. It is perfectly acceptabe to run one o2 and jump the two o2 wires at the ECU. The ECU is only monitoring the low voltage produced by the o2 sensor, not using it to power something, so sending the signal to two places doesn't degrade the signal. Just like if you were using one of those crappy narrow band A/F gauges that tap into the factory o2.


Modified by Shawnsblacksi at 7:45 PM 6/16/2006


Modified by Shawnsblacksi at 11:09 AM 6/17/2006

 

obd0 b16s came with 2 02 sensors.. why do you only have one?