Sorry, this is going to be a bit long, cliffs at the bottom. I've been searching around the forums for numerous days on supramania for an awser to this problem, but have yet to find one. I have a 1990 Supra Stock Turbo 5 speed that keeps sputtering when i accelerate and misses occasionally at idle. It runs extremely rough when cold and hesitates and stumbles when warm. The car is not showing any codes. It all started when i came home from college after the car had not been driven daily for a few months (my dad started it up about once a week) and the tempatures dropped below 20 degrees.
I figured it was a fuel pump issue, since everything else I tested was working, so I jumpered the fuel pump from the diagnostics box to make it run at 12v (or is it 11v) at all times... the stuttering and idling problem went away and it drove like a dream. I figured it was the relay, but couldn't find the procedure in the tsrm (at least in the EFI Fuel section) to check the fuel pump relay, so i replaced it with an extra one i had lying around; but the problem still persists. Anyone ever have a similar problem or a solution that does not involve running the fuel pump at 12 volts all the time?
Cliffs:Car stutters and misses unless fuel pump is jumpered from diagnostics box...no codes.
I figured it was a fuel pump issue, since everything else I tested was working, so I jumpered the fuel pump from the diagnostics box to make it run at 12v (or is it 11v) at all times... the stuttering and idling problem went away and it drove like a dream. I figured it was the relay, but couldn't find the procedure in the tsrm (at least in the EFI Fuel section) to check the fuel pump relay, so i replaced it with an extra one i had lying around; but the problem still persists. Anyone ever have a similar problem or a solution that does not involve running the fuel pump at 12 volts all the time?
Cliffs:Car stutters and misses unless fuel pump is jumpered from diagnostics box...no codes.
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