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The howell kit came with a 1 wire O2. everything in the kit is off a 4.3l GM. The kit came with an dignostics port. you can ground out the ADLA wire and the check engine light will flash a code. Nothing. I put it in field service mode (driving down the road while grounded) and It flashed...

Thanks for the advice. What would be the best way of checking\adjusting the mixture. The only adjustment the manual states is the idle speed. To adjust the fuel\air mix i have to grind the throttle stop flat, drill into the $1200 TBI housing to allow a T20 torx bit to fit. It seems crazy to...

I have an 89 YJ with a 4.2L. I ripped off the stock carb and replaced it with a TBI unit from Howell. Ever since it has been running a bit hot. I took out the stock 195 thermostat and replaced it with a 185. Its a new engine, with all new temp sensor, sending unit, water pump, ect. The...