I installed a Howell TBI unit on my 4.2 6cyl and it runs very rich.  The check engine light comes on periodically and I checked the engine code and all it tells me is the engine is running rich.....gee thanks.  It also idles high too, like the auto choke is stuck on but it's a TBI unit so there is no auto-choke.  My buddies jeep is running a Howell unit and has the same rich mixture problem.  Anyone got any ideas what to check?

Thanks
Roger  

too much fuel presure is a possibility...also a small exhaust or vacuum leaks..

there is a thresd on this somewhere...lemme find it...  

http://www.pirate4x4.com/forum/showthread.php?p=7840288  

We you able to figure out the problem ?    I am having the same issue with a Howell I just installed.

Thanks,
Bill  

Bill,  Were you able to identify the problem?  I am considering installing the Howell on my 86 CJ7 and want to learn as much as possible about potential problems.

Thanks,
Dan