Over the summer i rebuilt a b17a motor for my 91 integra. Stock rebuild except for:
-p30 pistons (11:1)
-exedy clutch
-lightened stock flywheel
-converted from obd0 to obd1 (running STOCK p61 ecu, STOCK 92-93 gsr injectors)

Its been running rich ever since i started it up. So far i've:
-new plugs
-new cap/rotor
-tried known good injectors
-tried known good STOCK fpr
-tried known good MAP sensor
-checked cat for clogs

I've also been talking w/ a guy i know from http://www.g2ic.com who has been interpretting the signals from my O2 sensor, ECT sensor and MAP sensor. As far as he can tell they are all working fine, although the O2 sensor may be working a little slowly.

Is there much of a chance that it could be the ecu making me run rich? Its a stock ecu from a 92 gsr that was wrecked. I've been trying for months to solve this problem and besides a new ecu and new O2 sensor i can't think of what else it could be.

tia.
-colin

 

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it could be either the ecu or the o2 sensor. i had the same problem about a week ago then i put in a different ecu and it was running perfect. not sure what you want to check. the ecu will prob be cheaper at first to see than to buy new o2 sensors. so it is one or the other. i would go with the ecu and see what happens after that

 

wow, you experienced a rich mixture and it turned out to be a bad ecu? As lame as it would be to have to replace the ecu... at least its a real possibility that it could be the actual problem. I'm SO tired of this problem. I don't mind if its expensive to fix! anything, i just want to know what the damn problem is!!!! ---sorry, but i'm sure you can see how frustrated i am by now.

oh, and thanks, it helps assure me that i'm not going crazy and that a bad ecu is a possibility.

 

anyone else have any info / input? thanks.

 

hey you could take your car down to the local parts store and have them run there little code scanner on it to find out exactly what is going on. that is another suggestion. it will tell you exactly what is happening and what is wrong with it? are you getting a cel? hope this helps alittle

 

How are you determining that your running rich? I have a B16A1 in my '92 Teg. I'm also experiencing a rich condition, but I can't even get my O2 on half the time because it is no longer being heated. I believe that if you did any sort of OBD conversion, your going to also be looking at a new Dist. and a new O2. Did you replace these or did you simply splice in OBD1 connectors into your OBD 0 harness for the injector hook up? I have to convert my OBD 0 B16 to OBD1 to make it work. My rich condition is partially the ecu (vafc fixed that) and now heating on the O2. Let me know

 

i know i'm running rich because:
-black smoke, lots of black soot on the rear bumper
-checked the plugs, look like plugs from a fairly rich motor
-inside of cat is black instead of white/tan color
-mechanic said i'm running rich
-O2 sensor readings seem to confirm the richness

I am using obd ecu, injectors, ecu, and a 4 wire heated O2 sensor.

converting your b16a to obd1 is easy. Just swap the distributor and injectors. use your original b18a engine harness and get an obd1 vtec ecu.

 

most likely a problem with engine displacement. I know its a small change, but it could do it. Try a pressure reg.

 

engine displacement? what does that have to do with the problem?

An aftermarket fuel pressure regulator *may* be able to fix the symptoms but it won't be fixing the cause of the problem. I don't want to use modifications like fpr's, apexi v-afc.... to counteract the problem because they are just covering it up, not solving the real problem.

 

Everythig would be ok, if we'd all just stop driving the **** out of our cars.
Bbut thats never going to happen

 

try your using the older obd electronics. This might fix your problem, since converter harness that aren't always on the up and up. Try putting your harness on another 90-91 teg to elimate all the variables.