ok here is the story, I've got a 1991 4.3 tbi with some recent engine work done, short block bored .40 over, it is a roller motor, I put a comp cam kit in it # CCA-K09-412-8 from summit, added some comp roller rockers, 1.6 ratio, an edelbrock intake, and msd offroad ignition box. the motor is mated to a 700r4 with a stak mini 3 speed behind that. the motor harness and tranny were pulled from a 91 s10 blazer which ran fine. I've put the setup in a 1950 cj3a. its running way rich,,,,,,,,
I've replaced the o2 sensor, fuel pressure regulator, injectors, and throttle position sensor. the fuel pressure at the throttle body is 11psi, took it to a local performance shop and they burned a new chip as to make it run leaner, and to remove the speed sensor, didn't help. they said it was the computer, tried two other junk yard computers (service #1228062). can't find any vacum leaks, idles rough but arround 500-700 rpm
as for the wireing harness, I took the stock one and weeded out what didn't need to be there, but there are a couple wires that went to the digital instrument cluster I'm not sure if they need to be hooked up, a white one I believe the tack from the computer, and a blue one, may be the speed sensor, anyway, I put in autometer gauges and ran wires from their sending units to them, not sure if the computer also needs those sending units, like the coolant temp, I believe the one in the front of the intake manifold is for the computer, where as the one in the block below the passinger side head is for the gauge, dont' think the computer needs the oil pressure. the vss I'm using in the stak t-case is from a jeep and is hooked to the autometer speedometer (ATM-1291) which puts out a 5v square wave. so can I hook this to the stock computer without messing it up?
any thoughts on where to go next with the rich running.
O'yea, no engine codes,
my next steps:
try a new Idle air control motor
painless wiring harness 60101 or something down that line.
I've replaced the o2 sensor, fuel pressure regulator, injectors, and throttle position sensor. the fuel pressure at the throttle body is 11psi, took it to a local performance shop and they burned a new chip as to make it run leaner, and to remove the speed sensor, didn't help. they said it was the computer, tried two other junk yard computers (service #1228062). can't find any vacum leaks, idles rough but arround 500-700 rpm
as for the wireing harness, I took the stock one and weeded out what didn't need to be there, but there are a couple wires that went to the digital instrument cluster I'm not sure if they need to be hooked up, a white one I believe the tack from the computer, and a blue one, may be the speed sensor, anyway, I put in autometer gauges and ran wires from their sending units to them, not sure if the computer also needs those sending units, like the coolant temp, I believe the one in the front of the intake manifold is for the computer, where as the one in the block below the passinger side head is for the gauge, dont' think the computer needs the oil pressure. the vss I'm using in the stak t-case is from a jeep and is hooked to the autometer speedometer (ATM-1291) which puts out a 5v square wave. so can I hook this to the stock computer without messing it up?
any thoughts on where to go next with the rich running.
O'yea, no engine codes,
my next steps:
try a new Idle air control motor
painless wiring harness 60101 or something down that line.
