Is this a fuel problem?
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Senior User
Joined: Jun 2009
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From: Oklahoma
Is this a fuel problem?
!985 F150 302 2bbl. aod. Starts fine cold, let it warm up & drive around slow all is fine, go out on the highway, say past 35-40, starts to miss intermittently. Shut it down let it cool, runs fine, I can let
it idle all day and no miss, what have I got going on? Could a fuel filter be clogging up?
thanks for any help
okiepc1
it idle all day and no miss, what have I got going on? Could a fuel filter be clogging up?
thanks for any help
okiepc1
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Joined: Nov 2007
Posts: 22,415
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From: Denver Metro Area, CO
a junkyard. This sounds more like an ignition-related problem rather than a fuel
delivery problem; in my experience, the symptoms of fuel delivery problems on
carb'd vehicles are similar to running out of gas. If the engine isn't getting
enough fuel to run over a certain RPM, it'll balk & surge as if it's running out of
gas.
But, if you have one of those feedback carbs (do you?) wait and see if somebody
knowledgeable in those things stops by and offers help or maybe try searching
the archives, there are all sorts of electronic sensors on those engines....
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Joined: Jan 2001
Posts: 56,971
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From: Virginia
If it was a fuel delivery problem, pulling hills should be really bad. Try a hill and really use it hard in high gear. This really uses the fuel and it should really buck and jerk if that's the problem.
Otherwise a slight miss at a light high speed cruise sounds like it might be a sparkplug wire or a sparkplug. At a light cruise the engine runs lean, and any weak spark problems will show up. Make sure sparkplug #7 and #8 are not routed next to each other, even though the cylinders are side by side. Run these two wires on opposite sides of the sparkplug wire holders.
Otherwise a slight miss at a light high speed cruise sounds like it might be a sparkplug wire or a sparkplug. At a light cruise the engine runs lean, and any weak spark problems will show up. Make sure sparkplug #7 and #8 are not routed next to each other, even though the cylinders are side by side. Run these two wires on opposite sides of the sparkplug wire holders.
