Throttle Position Sensor...

[djcannon]

Does anybody know if Ford still sells the throttle position sensor for the gen II?

My car takes a while to start when cold so I'm gonna troubleshoot and replace the TPS. It has a new IAB.

 

[SASHO91]

wow... thats a lost cause......

I would start elsewhere if your having starting issues....

 

[SHOtimer]

I'm not sure if that will help your problem at all, but yes Ford still does carry the sensor.

Doug

 

[CerberuS]

I got one in hand , but i doupt its that causing your issue, pm me if you still need it.

 

[djcannon]

I'm not sure if that will help your problem at all, but yes Ford still does carry the sensor.

Doug

You might be right, but for about $25, what the heck? And then I can always rule out the TPS if it acts up at a later time since it'll be new.

It always starts up right away once it's warmed up.

 

[sdpatt]

The TPS is a rather generic part and can be found at any auto parts store. I agree that it is not likely to help a tough starting problem. Have you pulled the codes?

Throttle position sensor, Wells TPS215, AutoZone, $18.99

 

[djcannon]

So am I just expecting too much of my SHO to start up right away when it's cold?

I never had this problem with the long crank-times on my other 2 gen II's...anybody got any other ideas?

Cam and crank sensors are new. so are the wires, plugs. can't be the fuel pump, can it?...since it runs fine and will eventually start??

nor could be be the coilpack, for the same reason.

so what causes prolonged cranks when a car's cold? is it anything that can be fixed? it must be fixable since my other 2 never did this.

 

[sdpatt]

Now that you provided a little more description to go along with your problem, it could very well be the fuel pump. To test, try turning the ignition key to ON, but not all the way to START. As you do this, you should hear the fuel pump in the tank run for about 1.5 seconds. It will shut off as a safety if teh engine is not running. Do this one or two more times to let the pump prime the fuel lines and provide some pressure at the injectors.

Now turn the key to START. If the car starts after the first revolution or two of the crank, the problem that is causin g your long cranking times is probably the fuel pump discharge check valve. This is really just a small ball bearing that prevents the fuel from flowing back thrgouh the pump into the tank after the pump is shut down (engine turned off). If this check valave leaks, the pressure in the fuel line is lost and the pump must run for a few seconds to restore the pressure.

This is more of an inconvenience than a driveability problem. Only replacing the fuel pump will correct this issue. That provides teh opportunity for installing a higher flow pump that will last many more miles than the stock flow pumps. The 155 lph Walbro pump in my SHO's tank has been going for about 200,000 miles. A spare is in the garage, but I have yet to need it.

 

[djcannon]

Now that you provided a little more description to go along with your problem, it could very well be the fuel pump. To test, try turning the ignition key to ON, but not all the way to START. As you do this, you should hear the fuel pump in the tank run for about 1.5 seconds. It will shut off as a safety if teh engine is not running. Do this one or two more times to let the pump prime the fuel lines and provide some pressure at the injectors.

Now turn the key to START. If the car starts after the first revolution or two of the crank, the problem that is causin g your long cranking times is probably the fuel pump discharge check valve. This is really just a small ball bearing that prevents the fuel from flowing back thrgouh the pump into the tank after the pump is shut down (engine turned off). If this check valave leaks, the pressure in the fuel line is lost and the pump must run for a few seconds to restore the pressure.

This is more of an inconvenience than a driveability problem. Only replacing the fuel pump will correct this issue. That provides teh opportunity for installing a higher flow pump that will last many more miles than the stock flow pumps. The 155 lph Walbro pump in my SHO's tank has been going for about 200,000 miles. A spare is in the garage, but I have yet to need it.

The fuel pump and fuel pressure regulator were actually the next things I was going to replace on the car, but not because I thought they were the problem.

I mean, if it was the fuel pump, then why does it only do it when it's cold?

What's the lph rating of a stock gen. II fuel pump?

 

[SASHO91]

IIRC, its a 112lph....
but some genII atx's (im not sure on mtx's) got the stock 60lph pump from the slo's.... or so the story is told....