nagel
Missouri
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Joined: 03/24/2005
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1996 E350 Ford 7.5L
Just noticed a slight "stumble" when in idle or driving. To address, replaced plugs, wires, cap, and rotor. Also, changed air filter, fuel filter and checked timing (right on 10 degrees). When driving occasionally the stumble will become very noticeable but has not stalled out. None of the things I've done made it better or worse.
Took it to the lake a month ago and it ran perfect. Came home and parked it with 1/2 tank gas. It's been very hot since then, wondering if got a lot of condensation in tank. Got up the other day and drove it to the gas station and put some gas in it. Following that noticed this stumble. Can't say if it was there before getting gas, but definitely after.
I'm wondering if I might have gotten some bad gas, but fill up other vehicles at same gas station and never had an issue. Today went to another gas station and got 10 gallons of gas and put a couple bottles of Heet in tank and still have the "stumble". Starts fine and idles fine, but occasionally can feel the stumble for a millisecond. I haven't put a code reader on it and the "Check Engine" light is not on.
Any ideas?
Snagel
Steven R. Nagel
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NewsW
US
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Joined: 02/06/2012
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You may have winter gasoline in it and drove it into a hot place.
Excess amounts of butane in the gasoline causes vapor lock and exactly the stumble you mentioned.
But if that is not it --- then filters, then check fuel pressure.
Check the dual tank switch valve.. a known trouble spot.
If possible only use OEM Ford parts as the aftermarket parts can be trouble.
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old guy
Oregon (pronounced Or e gun)
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Joined: 03/15/2006
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if you suspect water in the gas, I would put a bottle of rubbing alcohol in the tank. 90% or better. Heat, a winter anti free has the same stuff in it as the rubbing alcohol does. the alcohol will take care of the water problem. If you have the stumble after trying that, then I would suspect the spark control in the distributor. I can't think of what it's called, senior moment, but it replaced the points in the distributor
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Jerrybo66
AZ
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Joined: 10/07/2003
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I know I'm comparing apples to watermelons here but I had a similar problem in my '73 Ford. (my daily driver) A slight tweak with the timing curred it.......I need to sign off now and feed my pet dinosaur.. 
Support the Country you live in or live in the Country you support
2003 Sierra SP 26'Toy Hauler
1997 F-350, PSD, 4X4, red Crew Cab, long bed.
2007 Arctic Cat Prowler, Arctic Cat 500
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nagel
Missouri
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Joined: 03/24/2005
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Thanks for the replies.....
Who knows about the gasoline. I've ran 3-4 tanks of gas through it since May. In June ran several tanks and had no issues. A couple days ago put a couple cans of HEET in the tank and injector cleaner. Drove it about 25 miles today low speeds and on highway. Not noticing much at higher speeds but low speeds can feel the buck. Idling in the driveway, can feel and see the "miss".
I'm starting to think it may be a distributor issue like was mentioned, but still open to ideas.
Snagel
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deerslayerah
ELKIN N.C.
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Joined: 07/14/2009
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Was the gas Ethanol mix if it was and sit for a month it has seprated you may need gas treatment like seafoam
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nagel
Missouri
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Pretty sure it was ethanol...can't seem to find anything else around here.
Seafoam....are you thinking put some in the gas tank or hook it into the fuel rail?
Snagel
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deerslayerah
ELKIN N.C.
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nagel wrote:Pretty sure it was ethanol...can't seem to find anything else around here.
Seafoam....are you thinking put some in the gas tank or hook it into the fuel rail?
Snagel In the tank this type of gas is hard on fuel systems if it sets for long periods of time my boat carbs were gumed up by this junk took 2 cans of seafoam spray to clean them up the first year this fuel came out left it in the tank over the winter that may or may not be your problem but its sounds like fuel related
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NewsW
US
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Joined: 02/06/2012
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nagel wrote: I've ran 3-4 tanks of gas through it since May. In June ran several tanks and had no issues. A couple days ago put a couple cans of HEET in the tank and injector cleaner. Drove it about 25 miles today low speeds and on highway. Not noticing much at higher speeds but low speeds can feel the buck. Idling in the driveway, can feel and see the "miss".
This is what you put in:
Quote:
#1 Selling Gas-Line Antifreeze & Water Remover
HEET® brand is the #1 Selling Gas-Line Antifreeze & Water Remover. It removes water from the fuel system to prevent gas-line freeze-up and harmful rust and corrosion. Iso-HEET® brand is the #1 Selling Premium Fuel-line Antifreeze, Water Remover & Injector Cleaner. It absorbs 5 times more water than regular gas-line antifreeze, while it cleans fuel injectors and carburetors. It’s designed for use year-round in ALL 2-cycle and 4-cycle gasoline engines and diesel engines.
It is basically alcohol.
Dissolves the water in the tank together with whatever contaminants it picks up, and sends it onto the engine.
It also has a nasty habit of picking up / loosening deposits in the lines that may not have been a problem before you added it.
Furthermore, it probably went past the filter --- or was loosened from the lines past the filter.
If you are lucky, it is just globs of water etc. that will go away on its own as you use up the tank.
If you are not so lucky, and the gunk has partially jammed the fuel injectors... you are in for cleaning it and purging the lines.
Or replacement of the affected injector.
Now, this does not rule out other issues... like spark plugs.. etc.
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Calisdad
groveland, ca
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If you have a code reader see what it says. Its cheaper than throwing parts at it and they don't cost all that much.
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