I do not have a MAF, '95 engine/trans and '93 PCM in a Jaguar sedan.
Injectors not leaking, were cleaned and new everything in the fuel system within past 5000 miles. I did take off the injector electrical plugs one at a time to note any difference in the running - all off made it run worse. One spark plug wire was suspect so I put on new ones on the passenger side - the hardest to put on in this car. Other side can be changed standing up outside the car with feet on the ground! Will put them on while waiting for the Opti to return. Has almost new NGK 55 plugs that were pulled, re-gapped and checked for fire at the plugs.
FP is good 46# with key on and at idle 40#. It holds pressure for five minutes then drops slowly down to about 25. Filters (three) are all new and
clean (external) and the inline pump is near new. Stock fuel regulator tests fine and has no fuel in hose.
Cannot remove Dynaspark cap due to their security fittings. They warranty the unit and even provided UPS return to their site for testing. I hope it is
their unit again, they rebuild it completely for a flat $125.00 that includes return shipping and I get a "new unit 12 month warranty again".
All the Opti R&R fears are BS, removing it from my car is easy, the stock fans pull out, I have a Meziere electric water pump that uses the stock housing = (6) water pump bolts, hoses for heater and the large hoses for the radiator and electrical connector; take off the hoses and drain the radiator coolant first. The radiator and AC condenser are left in place and there is ample room to lean over and remove the rest of the stuff. Taking off the hood is the biggest problem and installing takes two people on my car.
The serpentine belt and then the front hub comes off and with three bolts and no puller is needed. Then (3) bolts and the Opti is off in your hand after removing the plug on the wire and the coil wire. Not as easy as a SBC distributor but easy enough. Removal takes less than 30 minutes...cleaning the water pump gaskets off the block and pump takes as much time
Putting it back is just the reverse procedure - put the cam dowel in the large hole in the center, lube the O-ring and press in gently. It will lay down equally in the hole and all three bolt holes will be flush again.
If the Dynaspark/ Opti is not bad, then I have no clue what could be wrong with the car...
never had the miss/backfiring and steady MIL light before. It always threw a code(s) when there were sensor or other problems.
Thanks for all the help and I will report back what else is done to make it run properly again. When it is running, it is a very fast good handling car due to the mods and 4:09 LSD gear ratio. It gets 20+ mpg at 65-70 mph on the highway even with the high gear ratio. It
does use 91 octane fuel....
1972 Jaguar XJ LT1/700R '95 Firebird, 52 MM TB, ported 2 1/2" Ram Horns, dual Magnaflows, A.I.R. delete, K&N cold air kit, EGR delete, Delphi Opti, Meziere water pump and 4:09 positraction Sold 4/6/2013 but still here for mods - gone 7/2015
1971 Jaguar XJ, 383/200R QJet, engine dyno @ 410 HP and 470 # TQ with 2:88 posi, dual Magnaflows and 2 1/2" ported Corvette Ram Horns