Cylinders not firing missing 2003 Ford F-150 70k fuel issue?

Tiny
MEDOSIER
  • MEMBER
  • 2003 FORD F-150
So I'm an idiot and I goofed up my fuel injectors up while changing plugs on 2003 F150 with 70k miles. :Shock: Don't ask. Got new kits, cleaned, and replaced. New plugs & air filter. Ran great. :D I take a little trip about 400 miles round trip with no problems. Next morning sputtering missing and acts like water in gas. :Roll: I figure I got bad gas on trip. I add fuel stabilizer. Runs great again. :D Think problem is gone. Take same Little 400 mile road trip (get gas at different store) get back it ran like a top. Next morning missing cylinders not firing again. :Roll: I get fuel stabilizer. Starts running OK again. I find it hard to believe I got bad gas twice from two different places. ? I might think fuel filter, but seems like that would not get better. Maybe electrical, but same thing I would not expect to get better. Same with injectors. I would think if they were bad, they would just be bad. Is this my fuel pump? : What I've read looks like it, but hate to spend the $$$ and be wrong. : Anything I should try first? Thanks in advance. :Lol: Cute little smiley faces. Hope it's not too much.
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Saturday, March 3rd, 2007 AT 5:51 AM

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Tiny
SERVICE WRITER
  • EXPERT
I'm a smiley fan too!


http://www.2carpros.com/forum/automotive_pictures/30961_winksmily_3.jpg



I doubt there is any relation to bad gas. VERY rarley do I see it, and when I do, it doesn't start at all.

I would check the fuel pressure when the problem happens and see if it is dropping off. I assume you have changed the fuel filter at least once, I do it every 30-35,000. Is there Octane boost in the fuel stabilzer your adding?

Seems like a common thread is the problem happens when it is cold. Is that correct?
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Saturday, March 3rd, 2007 AT 6:07 AM
Tiny
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Thank you for the reply. Actually, it happens when it is warmed up too. I was driving to a meeting the other day and it started up again. It stops and goes, but sometimes it can run fine for days. I thnk I have had the fuel filter replaced but would not bet a paycheck on it. I thought about just replacing that and waiting to see. But seems like if the filter were blocked that it would not get better. How would I go about checking the preasure? Thanks again for the reply to my question. :Roll:
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Sunday, March 4th, 2007 AT 9:41 AM
Tiny
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In addition to checking fuel pressure, should get the codes checked in the computer. You'll need to get a fuel pressure gauge. There is a port on the fuel line under the hood that it attaches to.
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Sunday, March 4th, 2007 AT 4:09 PM

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