| Hey Guys,
| I'm sure this isn't one you will come across often. I've put a Howell
| TBI kit onto my Jeep (AMC) 304 V8. It's got hedders, glass packs, and
| an Edelbrock Performer intake. I have an adapter to mate the GM TBI
| the intake. And it uses the GM ECM and a Howell-made wiring harness.
| Some of the wiring colors don't match up to GM wiring colors. But I
| have the kit installed and wired up, and the fuel pump and lines all
| it, it runs, but it runs too rich at idle prior to closed-loop
| operation. Once it goes closed loop and runs fine. Gets a bit too
| much fuel when really goosing it, but I've backed off the fuel
| regulator about as much as possible. I've cleaned out the TB, the IAC
| port, etc, and it still doesn't want to idle properly, it's trying to
| idle at 600 rpm, with some surging, to about 700 rpm. But as it
| continues to run rich at idle it will foul a plug and eventually stall
| the engine. I have adjusted the TPS setting so it is at 0.6V with the
| throttle plate fully closed as per the manual. When I first tried
| it would start, but wouldn't stay idled, it would stall out. So I
| increased the setting on the TPS until it would actually idle. It's
| now set at 0.75V with the throttle plate closed. And it ran fine for
| little while, but would eventually idle down from about 850-900 all
| way down to approximately 400-550 with a good bit of surging as the
| <I assume> was trying to regulate the idle. I have checked the IAC,
| measures out fine as far as Ohming it out, the MAP sensor reads good
| well. And the TPS works just fine as well. I don't have the ESC set
| up on mine, it's running with a stock Jeep distributor, ignition
| and an Accel super coil. Does anyone have any ideas on what might be
| causing the trouble and how to fix it. Also, when it is idling, I
| think with my current exhaust set up and the location of the o2
| it's not getting hot enough to stay closed loop at idle speeds. I
| it mounted just past the collector on the hedders, but since there is
| no cat (it's a 1973 Jeep), I'm guessing it's not staying hot enough,
| should I look into a 3 wire o2 sensor, right now it's a regular one
| wire set up. The TBI system is the same as the 86-90 truck set ups.
| As far as I know, it's the TB system for a chevy 350. I'm at a loss,
| about ready to make a bypass for the o2 sensor for when it's at idle
| and force it to run closed loop even if the o2 sensor isn't hot
| just substitute the voltage output it should be sending to the ECM.
| I've been trying for quite a while to get it going right, without much
| luck. Also, it's a manual transmission, I've seen there are two
| different version PROMs one for an auto and one for a manual, could
| this be causing problems as well, I'm not certain which one I have,
| didn't bother to open up the case and see what number is on it.
Do you think the TBI for the 4.3 V6 might make a difference? It is
closer to the C.I. than the 350.
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