Engine Howell 4.2 TBI ongoing idle and WOT fuel issues with new system
CJKen51
Jeeper
- Posts
- 17
- Thanks
- 3
- Location
- Colorado
- Vehicle(s)
- 1979 CJ5, 258, T18, Spicer 20, AMC20, D30 Silver Anniversary
Hello All, I have around 1 hour of actual drive time on my Howell TBI it ran "mostly" well to begin with and I was excited to drive it. Then, it just started leaning out and dying. Was towed home, by my son, that day. That was back in early June. Anyway, I've messed with this forever. The list of tests is a long one.
When I unplug the MAP sensor, it will actually idle. It idles smooth. Granted, it's rich and in a limp mode, which lines up with the service manual that was included in my kit. Plug the MAP back in and back to dying within just a few seconds. Here's the kicker: I've tried two different MAP Sensors. I also picked up an extra computer, since they were $95. Tried both of those and switched the PROM over, of course. I've talked to Troy, at Howell, 3 or 4 times now and I checked and verified everything he asked. Looking for a tip on anything else I could check. Thanks, in advance.
When I unplug the MAP sensor, it will actually idle. It idles smooth. Granted, it's rich and in a limp mode, which lines up with the service manual that was included in my kit. Plug the MAP back in and back to dying within just a few seconds. Here's the kicker: I've tried two different MAP Sensors. I also picked up an extra computer, since they were $95. Tried both of those and switched the PROM over, of course. I've talked to Troy, at Howell, 3 or 4 times now and I checked and verified everything he asked. Looking for a tip on anything else I could check. Thanks, in advance.
