Hi guys,
I'm a 240 guy that just broke out of the mold and bought my first 740. It's a 1991 and it has what I was told is the Rex Regina system. I've worked on hundreds of 240's with the Jetronics systems and I feel pretty confident about my abilities but this looks more like a GM type system.

I bought the car thinking it just had a bad AMM only to find it doesn't have one. The car would crank and idle really low and if you babied the throttle it would run pretty well but it still wasn't drivable. As it was running just off idle it smelled as if it was flooding and then it started to miss one cylinder at a time until it died. After it dies I couldn't get it to restart it would only hit every now and then as if it fouled the plugs. The previous owner said he had recently installed new plugs and wires which makes me think this is not the first time it's done this.

HOw does this system work? Is the sensor in the intake hose a IAT (idle air temperature) sensor? Will it cross with any american car? Does it have a MAP sensor? If it is flooding can I troubleshoot it similiar to the same condition on a Jetronic system. Will it run with the O2 sensor unplugged? Can I force it to run in an open loop with the sensors unplugged? I'm sorry for all the dumb questions but I really need to drive it home (about 10 miles).

It has a check engine light on. can the codes be checked like on a 2.4/3.1 system and are the codes the same?

Thanks so much for your help.

Tony T
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Tony Turner 89 Volvo 240DL 257K, 1980 Mercedes 240D 360K, 1982 Mercedes 300D Turbo Diesel 153K, 2 1992 Geo Metro Convertables (I'm not sure why??)