Throttle Body Fuel Injection - Starting problem

Late 80’s Ford Lincoln Town Car w/Throttle Body Fuel Injection won’t start unless we pour gas in the carborator then starts and runs fine. Turn off ignition try to start car again and it won’t start on it’s own. Some times jiggling fuel injector wire from gas petal makes the car start. Any ideas, thanks, Rob.

I’d start by checking to see if it is reaching the proper fuel line pressure and holding it while attempting to start the car.

Wouldn’t fuel line preasure be fine if the car runs fine after it starts? Thanks, Rob.

Do you have a electric or mechanical fuel pump?

You need to make sure the fuel pump is on while cranking the engine.

I had a car (not a ford) that powered the fuel pump with the starter circuit when cranking, and then from the oil pressure switch once the engine was running. It was done this way so if the engine quit in an accident, the fuel pump shut off. You car may be similar.

I think sometimes these throttle bodies receive information from a coolant temperatue sender (usually at or near the thermostat housing). When the engine is cold then the sensor instructs the throttle body to enrich the mixture, just like you do when you pour the gas in there. A bad cold start sensor could be the culprit.

Not if the EEC is not turning the fuel pump on until after the engine starts. It’s a long shot, but it is possible.

Do you have the problem only when the engine is cold, or do you also have it trying to restart a warm engine?

It is electric.

that is not why that feature was invented,it was for a dry start and to save the engine only,not crashes.

both cold and warm. The bad cold start sensor sounds like a good prospect. Thanks.

Not if you have the problem when the engine is at full temp.

It is too a safety feature. Where does your info come from.

Ya, makes sense. Mmmm. So the question is what’s different about the fuel delivery when the car is off then when it’s running, as the car runs fine after it is started. Pumping the gas pedal to put gas in the bowls before starting does not seem to work but that is probably as designed on a TB fuel injection. I am more familier with regular Rochester four barrel carborators - ah the old days! We also have a new battery in the car we purchased last week and no touble starting once we pour gas in the barrels - so doesn’t seem like the starter or celanoid.

If this is throttle body fuel injection, you don’t have bowls, you have injector(s).

You say it doesn’t start both cold and warm, or “Turn off ignition try to start car again and it won’t start on it’s own.”

How warm are you talking about? The temp guage (if you have one) needs to be in the normal range and/or the heater has to able to put out hot air and radiator hoses pressurized, to be “warm” and not “cold.” Just restarting doesn’t make it a warm/hot start.

I’d go back to the fuel line pressure suggestion. Although the fuel pump might be delivering suffucuent pressure, if the injector is leaking when closed it can allow air to enter the line when the engine is off and that can allow the gas to run back down into the tank. When retstarting the fuel line then has to be refilled and repressurized before the engine iwll successfully restart. This can eb tested for simply by turning the key to “on” a few times, for a few seconds each time, prior to going to “start”. That allows the pump to refill and repressurize the line.