1992 Porsche 968, used very infrequently. It would not start, and my brother in law replaced the battery, fuel pump and filter, and then replaced the DME sensor. It started and ran for about two days, but now again refuses to start. I can't tell whether I'm dealing with a fuel delivery problem or a lurking electrical problem.
Check out your 2 sensors on the bell housing , at rear of the engine one is reference sensor the other is engine speed sensor , this will not allow injection or ignition if one is defect , change both , there the same , lots intermitent problems from these sensors
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Not much left unchanged is there and no doubt you have done compression testing on all 4 cylinders as well. (If not you need to). I assume it is cranking over normally with the starter motor but not firing.
I would try one of the Porsche Owners Forums for this as one of the other 944 owners there should be able to help..... Like this one..................
When was the last tune up? What was changed? Coils are notorious for a non running condition. Dead cell in battery or loose battery connections can make it stall. Bad alternator also. Bad fuel filter or fuel pump. Any of these are places to start checking.
Underhood fuse block swap out relay #7 thats the ECM relay. Ground Circuits Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion and loose connection on ground lead. See ECM GROUND LOCATION table for ECM ground location. Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo