91 740 with Rex Regina ignition
Here is my dilemma (figure this one out and i will buy you a case of beer!)
I recently purchased a 91 volvo 740 sedan with a bad engine (head gasket blew and caused water to enter cylinder causing a hole in piston). I had a 89 240 engine in good shape so I used the 240 engine long block and switched all wires and plumbing from 740 on to this 240 230f.
Every thing fit ok and was very similar except for alternator ac bracket, power steering bracket and of course the distributor location.
I decided to keep distributor in the 240 side block location (for ease of service as opposed to the rear of head location for distributor on 740 series.( Yes, I plugged the hole in head. ) This version and vintage distributor design is merely a cap and rotor, no hall sensor or breaker of any kind. This is true for both 740 and 420 versions. So, coil wire and spark plug wires are only connections on this distributor. Best thinking among local Volvo knowledge pool is that it should not make any difference where distributor is located. (So we think).Has any body did this swap out there?
I spent time and did it right, tried to be as meticulous as possible on this job, this is not my first engine swap in these 240 740 cars.
It will not start. 2 days of double checks and reading Bentley and Haynes manuals, gleaming as much from Brickboard as I can.
Here is what I know:
Engine ran in 240. 740 was down due to catastrophic engine failure, not electronics gremlins. However, cannot get it to fire up in the 740. My brain hurts; help!
-It has Spark and fuel injection function, will not start even with generous amounts of starting fluid. Has good spark at plugs, pulled injector rail and watched it spray. All fine.
Crank sensor ok
I never removed flywheel so sure and checked before assembly that sensor holes were lined up right.
(Are fly wheel sensors the same on both cars?)
I tested Rex Regina components, got a less than perfect reading from air mass temp sensor. no I don’t have a spare. Could this be cause of no start?
I have been deep into troubleshooting, taking as much from Bentleys at Ecu test procedure as applicable. Some Ecu connections are different in book than in this car, but many are same in areas of basic function. All looks ok as far as basic trouble areas such as throttle sensor, hall /crank sensor If this was bad I would have no spark or fuel? Or am I confused about the function of the flywheel sensor ring and distributor relationship? I know in older versions of ignition hall sensor shuts down spark / fuel as safety in accident. I did not compare 240 and 740 fly wheel sensor wheel patterns, are they different? Any Help greatly appreciated.
dave in michigan