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Old 11-20-2013, 09:42 AM   #1
Trev FF
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Sputtering Problem???

ive had this foci for 2 year now, i have put 3 fuel pumps in. All BOSCH.the first one died within a month replaced it. the 2nd one lasted a year an it started sputtering again when i give it WOT. i just replaced it AGAIN yesterday through my handy access door. An ive drove it 2 days and it is better but its still sputters a little.
I do not understand this.
no CEL.
could it be a ground wire?
eletrical problem?
coil?
computer?


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Old 11-20-2013, 10:05 AM   #2
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moved to technical chat
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Old 11-20-2013, 12:35 PM   #3
brady2005
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Quote:
Originally Posted by Trev FF View Post
ive had this foci for 2 year now, i have put 3 fuel pumps in. All BOSCH.the first one died within a month replaced it. the 2nd one lasted a year an it started sputtering again when i give it WOT. i just replaced it AGAIN yesterday through my handy access door. An ive drove it 2 days and it is better but its still sputters a little.
I do not understand this.
no CEL.
could it be a ground wire?
eletrical problem?
coil?
computer?
Have you been installing new fuel filters when you replace the fuel pump? If not when was the last time it was replaced? I doubt it would be a coil/injector if no CEL is present.. It could be electrical, not sending enough voltage to the pump to perform it's job, you should get a multi meter and probe the wiring for the pump and see that it's getting the correct voltage. The could be blockage in a fuel line somewhere making the pump work harder, and burn out faster.

Check the filter if you haven't replaced it, but I'm sure you have been replacing them when your replacing the pumps as that's standard practice.

I'd say either electrical (not enough voltage to run the pump effeciently), filter, or some sort of blockage burning out the pump, or you constantly run your gas tank low, which heats the pump up and burns it out. I'm not too sure what type of fuel system the foci runs ( return style or non return) but a pump with a return style fuel system, the pumps PSI stays steady at no throttle, and WOT, so it wouldn't matter, if the pump is gone, it will present itself at all times not just WOT. How confidant are you that it's the pump again?

Does it turn over ok when started? Any loud whining noises coming from the tank? Have you done anything else to the car recently?
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Old 11-20-2013, 05:40 PM   #4
Trev FF
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Starts fine
Fuel filter changed with last fuel pump a year ago
It's probably electrical. Cuz when it sputters / stumbles. My gauges jump.
Only mods I've done are
Short ram intake.
And a cat back
Close to puttin on the svt header.
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Old 11-20-2013, 05:41 PM   #5
Trev FF
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And it's non return
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Old 11-20-2013, 05:42 PM   #6
Trev FF
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I hear the pump prime wen I cut the key on. And don't hear it at all after it cranks.
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Old 11-20-2013, 06:42 PM   #7
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if gauges bounce around could be loose wire,,poor conection somewhere,,,good luck
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Old 11-21-2013, 05:21 PM   #8
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maybe the driver module? It's a small circuit board under the rear seat. Not really sure how you'd test it, unless it was an outright failure and getting hot.
I haven't seen many complaints about it on this forum, but my dealer told me once that it's been known to fail on early Focii.
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Old 11-21-2013, 05:40 PM   #9
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Yea my friends a mechanic an he went over with me what could be wrong. An that was one of the things. I've changed it before. I put an 02 focus driver module in. Was fine for a while. Till the sputter began again.
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