93 Taurus SHO cranks sometimes.

[KeithBRoberts]

Okay thanks for this info. It has a new fuel pump, fuel filter. Coil pack, wires and plugs. When I drove it home I didn't have to keep it running by giving it gas. It would idle for me. Just yesterday when I moved it I had to keep it running. I'll do these test and see. I'll be in touch

 

[Devin]

And check the codes.

 

[Off Road SHO]

I think your MAF sensor is broken so the computer thinks no air is going in. Won't give you any gas through the injector if there is no air being reported.

Tom

 

[Devin]

But he unplugged it, which should make it a different condition to the PCM

 

[KeithBRoberts]

But he unplugged it, which should make it a different condition to the PCM

Okay I'm about to buy one. I'll let y'all know what happens.

 

[Off Road SHO]

But he unplugged it, which should make it a different condition to the PCM

That is correct. The PCM is receiving a "no air" report and acts accordingly. It will probably only give enough gas to operate from Idle Air Bypass air.

Tom

 

[KeithBRoberts]

Makes sense. I'm about to put it on and try it, I'll be back on

 

[KeithBRoberts]

Ok. I put it on. I tried and it acted like it was gonna start for that first second and nothing after that. But yesterday it did not start at all either. The day before that it started but wouldn't run without throttle and ran real ******. The day before that I drove it home. It idle'd but ran a little rough when accelerating. That's the timeline

 

[KeithBRoberts]

I also tried to do the code test. Stuck a paper clip in the right spots. Turned the switch to on but running. I didn't see the CEL blink at all

 

[SHOdded]

Ok, just to look at something else ... fuel system. You said new fuel pump? Do you hear it prime when you Key On Engine Off? What is the fuel pressure at the rail? Have you checked the fuel regulator vacuum line for the presence of fuel?

This is all following up on the previous post
http://shoforum.com/index.php?threads/93-taurus-sho-cranks-sometimes.134515/#post-1468272

 

[luigisho]

Even if it's a code that says all clear, the engine light should still blink out something during the test

 

[Devin]

Turn the key to the off position. Install the paperclip in the ecu, test harness (passenger side of engine compartment). Turn the key to the "on" position. You should hear the fuel pump prime, some clicking noises, and the fan run for a few moments. Any of that happen?

 

[pjtoledo]

in the picture the MAF is not plugged in properly, the connector is not seated all the way. we can only presume you plugged it in correctly on subsequent work. is it on correctly now?

 

[KeithBRoberts]

Yea I seen that.

 

[KeithBRoberts]

I still can't get the CEL to blink

 

[luigisho]

That's either operator error or maybe computer. Best guess is you're doing it wrong

 

[Devin]

I still can't get the CEL to blink

Can you confirm what I posted in post #32?

 

[luigisho]

You took the cover off the larger plug and jumpered the correct pins?

 

[KeithBRoberts]

Yes. I even used wire and male connectors

 

[luigisho]

There should be something when you jump the connectors. A OK flashes, cycle the fuel pump and the fans turning on briefly, something. If nothing is going on then you really have an issue to track down