We feel like we've tried everything here.
It gets spark, it gets fuel, timing has been checked repeatedly. All the sensors ohm out correctly, replaced the CPS anyway, swapped ECUs, cleaned injectors, compression is 185 across the board, stomp test shows no codes, fuel pressure is right around 40 psi. coils fire.
It tries to start, stumbles, bucks, backfires, just won't go. It feels like an ignition problem but the coils (on plug) are in the right order as traced back to the ECU. watching them fire it looked like they all sparked at once quickly before going into the proper firing order. Not sure if that is normal.
Had ran some old/bad fuel through that seemed to stick the injectors open, but fuels been drained and swapped and injectors cleaned, they appear to function properly.
What are we missing?
I think the fuel pump is from an m20 car which may be slightly lower pressure than the m42 pump? But I doubt that could cause this type of problem.
What are the bare minimum sensors that need to be functioning to get it to run at all?
It gets spark, it gets fuel, timing has been checked repeatedly. All the sensors ohm out correctly, replaced the CPS anyway, swapped ECUs, cleaned injectors, compression is 185 across the board, stomp test shows no codes, fuel pressure is right around 40 psi. coils fire.
It tries to start, stumbles, bucks, backfires, just won't go. It feels like an ignition problem but the coils (on plug) are in the right order as traced back to the ECU. watching them fire it looked like they all sparked at once quickly before going into the proper firing order. Not sure if that is normal.
Had ran some old/bad fuel through that seemed to stick the injectors open, but fuels been drained and swapped and injectors cleaned, they appear to function properly.
What are we missing?
I think the fuel pump is from an m20 car which may be slightly lower pressure than the m42 pump? But I doubt that could cause this type of problem.
What are the bare minimum sensors that need to be functioning to get it to run at all?
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