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gary here, sorry to hear of your friends misfortune :(
what year make and model does she have?
Toyota Supra 1995
The car is in her garage. It does have gas in the tank. She has tried driving it with a full tank and also with an almost empty tank but with the same results. I don't know if the car is turbo or non-turbo. A mechanic has driven the car. It stalled on him, but he was unable to find what the problem is. The way she describes it, it seems that it goes fine until she has to slow down. Or going down hill. That's why I thought there might be dirt or sludge in the tank, but a mechanic told her it could not be that. She buys her gas always at the same gas station, which is a reputable one. I use it myself.
It is non-turbo. The engine does start immediately after the stall.
Engine light is on.
The fuel pump is new.
Not sure of the rpm. Will have to check the rest.
The only thing that I can tell you at this time is that the plugs are new and so is the fuel pump. "Check engine" light is on.
Thank you for the " bad fuel pump relay and main relay" advice.
I'll have to check about the spark when cranking the engine. And the coil. Can't do it right now. You have helped a lot.
The ECM contains a built-in self-diagnosis system by which troubles with the engine signal network are detected and a malfunction indicator lamp on the instrument panel lights up.
Turn ignition switch on.
Let me know what code are you getting.
Thanks for the expert advice. At 90 years-old I am reluctant to get too involved with the hands-on work. I will pass on what you have told me to the owner of the car. I have an idea that what you have prescribed has already been done. That is how I got involved. The car-owner is at the end of alternatives. That is why I settled on the old dirty gas solution.