EFI Prob: Died going down the road

[Sbolt19]

I was driving home for lunch on Friday and my EB started acting up. There were no warning signals, nor did it act like something was wrong. I was going up a hill and it was like someone reached over & turned the ignition off. I got it pulled over and it started right up without a problem, and it did it again. Actually it cut out 4 times in a 2 mile trip.

The system that I am running is off of an 87 Mercury Grand Marquis, speed density unit. I have checked the fuel pressure on the rails to see if it was the fuel pump not getting pressure, but I am running between 34-36 with just the key on, not the engine on. I thought that the pressure was supposed to be between 24-28?? I have checked all electrical connections, coil connections, batt. etc. and everything is tight & secure. I am, by no means, an EFI guru, but I can't figure this one out. What would cause it to cut out just all of a sudden?

 

[66fora69er]

Fuel pressure should be close to 40. May have an issue with the fuel pump relay???

 

[rustbucket]

Does the speed density have TFI? If so, that's where I would look.

 

[needabronco]

My vote is a faulty TFI module? Although your fuel pressure seems a little low too. Check your grounds on the fuel pump as well.

 

[ransil]

Pull codes first..
fuel pressure look Ok for now until you verify your gauge and do further testing.
put a known good distributor in it.. ( TFI & hall sensor)
do a wiggle test of the harness, might be something intermittant

 

[Steve83]

Put the gauge where you can see it while driving:



When the engine stalled, did the CEL come on? (You DO have a CEL, right?) If not, what style of EEC PWR relay are you using?

 

[brianstrange]

My vote is a faulty TFI module? Although your fuel pressure seems a little low too. Check your grounds on the fuel pump as well.

Check for spark. If no spark, my wallet is on the TFI