Won't run when warm???

[tmielnichuk]

SHO--ripper:
I think your problem isn't fuel related. I think you need a new CMP.

New CMP is in. Test drove for 30 minutes. Car died AGAIN. I let it idle in the driveway for a while after my test drive and as soon as I touched the gas pedal it stumbled and died.

Restarted the car, tried to give it some gas, it sputtered and died. Drove it to the end of the street, same problems as I described at the start of this topic.

headbang

Since I've now replaced every damn SENSOR on this car I am left with no other route to go than Fuel Pressure Regulator.

If the FPR malfuntions and bleeds off all the fuel pressure that should explain my problem correct?

I understand that the FPR acts as a "dam" at the end of the fuel rail, just before the return line and maintains a constant fuel pressure in the rail. Soooo... if the FPR is shot and stays in the "open" position it would bleed off too much pressure. Further, since the FPR uses vacuum to operate properly, the higher RPMs are forcing it to operate somewhat properly due to higher vacuum pressure, but when the car slows and RPM drops, the FPR fails to maintain pressure. I am assuming here that the heat is exagerating this problem.

How about that for my theory?

I will try to get my hands on a fuel press. gauge soon, but I am running out of money to throw at this thing.

For the record, what should my fuel pressure be at the rail both at idle and under throttle? And how about with the FPR vacuum line removed and plugged?

shrug

keep em coming guys...

 

[94' SHO]

Hey man same things happening to my car and i just got it yesterday...it's a 94 sho 5 speed...i was only driving it for maybe an hour then this crap happend.....please email me at [email protected] or reply here...i guess what i'm wondering is what all you did to fix your's...also reving it up to the rev limiter isn't good and that might have played a factor if you did that...and also i might just be the fuel pump but they can be pretty expensive..and for a 17 years old..and paying off the loan and cell phone price is a B****...haha again please respond when you get some spare time.thanks Adam doh

 

[tmielnichuk]

HMMMMMM...

Parts guys are idiots. I got to the parts store this morning to pick up my new shiny FPR and what did he hand me?

A DELCO UNIT! What the fu..????

Needless to say it was for a Ford Ranger or something stupid so I was a bit ******. No Ford parts today!

What I did do was pull the vacuum line off the top of the FPR (again) after the car failed on the way home from work last night, and got a nice little "puff" of gasoline! Yup, it acually leaked out a couple drops of gas from the top of the FPR and I could smell it too.

I guess that means that I've FINALLY found out it IS the FPR!!! thumb I guess the bladder is slightly ruptured or something but doesn't show up untill the heat or stress of stop-and-go causes a failure. shrug

I will have to live with it till Monday when Ford gets open. No Autozone up here in Canada!



frown

 

[projectSHO89]

Ruptured diaphram in the FPR. Kind of common on 4.0 Explorers, but hadn't heard of in in SHOs.

Maybe you've found it.

Steve

 

[94' SHO]

How much is a new FPR??? gunna cost for your sho? See my problem is i dont have alot of cash..with me just buying the car and all...but what ever she needs i'll do it...i drove it today and damn she's quick...i tried getting up to an import to race him but he turned into a drive way...oh well i'll get one sometime..haha

 

[tmielnichuk]

94' SHO:
How much is a new FPR??? gunna cost for your sho?

Welcome to the forum, you'll find all sorts of great info here, and really good people too! Enjoy your new car and take care of it!

I'd start by getting the codes off your ECU (numerous posts here on how to do it or check www.shotimes.com) and go from there.

If you don't uncover any codes, then post a topic on what the symptoms are and try to get it narrowed down a bit.

It would be helpfull if you knew what (if anything) has been done in the way of new parts or maintenance on your car.

Check www.autozone.com for prices on the FPR in your area.

Do what I did and pull off the vacuum hose going into the FPR on the fuel rail and check for fuel or smell of fuel. You may have lucked out and found the problem right away.

As for the racing... I'd seriously stay away from it untill you get all the problems with your car sorted out!

DON'T RACE WITH A SCREWED UP ENGINE!!!!
Do You want to break something else? rant

Also get the fuel pressure at the rail and see what you get. I'll e-mail you the directions in a minute.