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2003 Taurus: intermittently..restart..towed..Fuel pump was replaced

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2003 Taurus, 24valve; car stalls...
2003 Taurus, 24valve; car stalls intermittently, cannot restart but does start after some hours have elapsed. Has been towed to garage twice. Fuel pump was replaced. Problem returned; back to garage but problem disappeared. Now displays error code: P0191. Any suggestions what may be causing this intermittent problem? What can I check at home?
Submitted: 6 years ago.Category: Ford
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Answered in 15 minutes by:
4/12/2011
Ford Mechanic: Pavlin Koev, CERTIFIED TECHNICIAN replied 6 years ago
Pavlin Koev
Pavlin Koev, CERTIFIED TECHNICIAN
Category: Ford
Satisfied Customers: 3,486
Experience: 17 YEARS HANDS ON EXPERIENCE, TRUCK&COACH TECHNICIAN LICENCE
Verified

Pavlin Koev :

Hi and Welcome to JustAnswer! My name is XXXXX XXXXX I will do my best to help.

Pavlin Koev :

looks like problem still with fuel/ this code is for fuel rail pressure sensor.

Pavlin Koev :

We need to know though, when car stalls, what is causing it? do you not have fuel pressure or spark?

Pavlin Koev :

if no fuel pressure, you can try to replace fuel pump relat first,

Pavlin Koev :

replace PCM power relay as well.

Customer:

How do I check fuel pressure? I can't find a test port with a schrader valve as my other car has. I think spark is OK as "check engine" light goes out when cranking engine.

Pavlin Koev :

do you hear the pump when car does not start?

Customer:

Yes, when I turn key to start the fuel pump runs for 1 - 3 sec.

Pavlin Koev :

it may still be the pump, some aftermarket pumps will not work properly.

Pavlin Koev :

check injector pulse.

Pavlin Koev :

pull one injector connector when car stalls.

Pavlin Koev :

using test light check for power at one of the wires when ign is ON

Pavlin Koev :

then connect test light to battery power and probe the other wire, light must be blinking when engine is cranking.

Pavlin Koev :

if you have spark and injector pulse, this pump is not good.

Customer:

garage claims an OEM pump was installed, but of course I don't know with certainty. Am I correct that if the "check engine

Pavlin Koev :

yes, that indicates crank sensor is received.

Pavlin Koev :

sorry, I mean crank sensor signal

Customer:

Since the "check engine" light goes out when cranking the spark is probably OK, I will try a volt meter on an accessible injector next. One problem is that the car is running fine now, waiting to quit at the least convenient time(Murphy's Law). Any suggested tests I can do now when it is running well?

Pavlin Koev :

when it is running, there is nothing you can see, unless it is not running fine, but i will suggest those relays replacement.

Customer:

Thanks for your answers. I should have realized there usually is no simple cure for an intermittent. One more question. Do you know if there is a test port somewhere on the fuel injector rail or elsewhere where I can measure fuel pressure? After this I'll press the Accept.

Pavlin Koev :

it has to be, just a minute to look at diagrams

Customer:

My Haynes manual doesn't mention nor show one.

Customer:

I thought of one more question. My simple OBD 2 indicator only shows P0191. Is there more information stored in the car computer that a more sophisticated indicator would retrieve and display?

Pavlin Koev :

On vehicles not equiped with pressure test port, you will need to use adaptors to hook up testing pressure gage.

Pavlin Koev :

yes

Pavlin Koev :

there are many layers of communication levels,

Pavlin Koev :

code reader will only read basic engine codes

Pavlin Koev :

with scan tool you can see all sensor live data and compare parameters.

Pavlin Koev :

pay attension to theft light, it may be part of the problem.

Customer:

I thought I was finished but one more. You mentioned theft light. I don't know what it is.

Pavlin Koev :

alarm, must have red light on dashboard-security light

Pavlin Koev :

when key in ignition it mast go off after 3 seconds

Pavlin Koev :

if blinks or stays on then there is problem.

Customer:

This is getting complicated. How is the theft light related to intermittent engine stalling?

Pavlin Koev :

theft control module will shut fuel if activated, but if you do not see light blinking or being ON, then that system is OK, I just wanted you to be observant about it.

Pavlin Koev :

Do you have any other questions? I am getting tired,and must head to the shower.

Customer:

Thanks for your help. I'll give your suggestions a try. Or I might consider my wife's suggestion - its time for a new car.

Pavlin Koev :

LOL, We should listen to wifes more often I think, thank you for the accept.

Pavlin Koev
Pavlin Koev, CERTIFIED TECHNICIAN
Category: Ford
Satisfied Customers: 3,486
Experience: 17 YEARS HANDS ON EXPERIENCE, TRUCK&COACH TECHNICIAN LICENCE
Verified
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Pavlin Koev
Pavlin Koev
Pavlin Koev, CERTIFIED TECHNICIAN
Category: Ford
Satisfied Customers: 3,486
3,486 Satisfied Customers
Experience: 17 YEARS HANDS ON EXPERIENCE, TRUCK&COACH TECHNICIAN LICENCE

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