I recently installed a b20 motor in my integ and been having problems with the check engine light saying that there is a problem with the crankshaft fluctuation sensor (or no sensor at all)...When I come to a stop and put the car in neutral the rpm's shoot up to about 2500 rpm's above idle, also when I'm driving and take my foot off the pedal to decellerate, then press on it again the car seems to hesatate for a second or two before it will speed up again...Is this the cause of the flucation sensor? The b20 motor is the jdm version and the place where the sensor usually (which is by the crank pully) is not there. I am also running an OBD2 computer and am having suspisions that this motor is an OBD1 motor...So my final question is if I were to get a OBD2 to OBD1 coversion harness, will this fix the problem or will I have to install a crankshaft fluctuation sensor?
Any help will be greatly appreciated.
Thanks, -ED

 

up

 

I don't know that it is totally you're problem because when I've seen people try to install a motor without a CKFS and run an OBD2 ECU, you normally just get a CEL... If this problem is being cause only by not having a CKFS then a OBD1-OBD2 jumper would surely fix your problem... If you can I would first test it by possibly borrowing a jumper... If that works and you feel comfortable making one get an OBD2 ECU and some OBD1 pigtails then you'll be set... If not then you can just buy one... Sorry I couldn't be more of a help, Latez