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Car does not start isuspect the ECU and or the Air mass meter 200 1990

I am trying to get a 240 1989 going I have spark , timing belt is ok, there is no problem with the relay forthe fuel pump or the fuses.
I can hear the main pump humming.There is gas in the tank above the level of the rubber hose to the in tank pump that may have split.
I have access to a good ECU and a good AMM from a 1990 240
I was wondering if they could be swapped to confirm or rule out these as the faulty parts.
If I have a faulty AMM or if there is a crack in the bellows air duct downstream from it could , I possibly get the car started and get going on the limp home mode by disconnecting the AMM
I heard that somme 1989 have weak ECU and was wondering if one from a 1990 could replace it . Where is situated the ECU anyways.
Any help would be appreciated.

Bearnoel






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