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Explorer, Sport Trac, Mountaineer & Aviator 1991-1994, 1995-2001, 2002-2005, 2006-2010 Ford Explorer

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Old 12-25-2008, 11:37 PM
dsljay dsljay is offline
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stumbling on acceleration

My wife 2002 Mountianeer with 66K, awd, v6,and auto stumbles when I try to accelerate while moving. EX. if I am driving about 45mph and I try to increase my speed, the car stumbles or shutters for a second or two then it accelerates fine. I don't have a check engine light on, yet.
Any ideas what could cause this problem?
Thanks,Jay
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Old 12-27-2008, 07:41 PM
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Paulford8 Paulford8 is offline
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This start all the sudden? I have had two similar situations.... Water vapor in your fuel lines could cause stumbling. Have you tried a dryer like Heat?

I had a 99 Ranger with a 3.0 that stumbled off and on for months while I chased my tail around. Problem ended up being crap in my fuel injectors. In this case I ended up cleaning some with carb cleaning and re-installing, and replacing 2 that did not read in the normal resistance range (you can check this with a multi-meter if know what resistance is suppose to be).

Fuel filter changed recently? That is another easy possibility.... Good Luck!
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Old 12-30-2008, 07:56 AM
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dan8052 dan8052 is offline
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All I can say is... "Red-Line S1 Complete" fuel system cleaner! Good Luck!
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Old 12-30-2008, 09:46 AM
Bear River Bear River is offline
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Bear River has a very good reputation on FTE.Bear River has a very good reputation on FTE.Bear River has a very good reputation on FTE.Bear River has a very good reputation on FTE.
Actually, two of my vehicle at one time would stumble, and both had the same issue, a dirty/fouled MAF sensor. If the MAF element can't give you accurate information about the amount of air going into the engine, the computer will not add enough fuel, causing lack of power and stumble/hesitation. As the airflow increases, the inaccuracy is still there, but becomes less significant or noticeable.
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Old 12-31-2008, 03:14 AM
srercrcr srercrcr is offline
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Hows your prev maint doing? Cleaned throttle body valve recently?
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Old 12-31-2008, 08:56 AM
dsljay dsljay is offline
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Here is where I'm at. I'm trying to change the gas filter,BUT, I can't get the gas line off on the side that needs the tool to remove. I have the tool, BUT I just can't get it off. There must be a trick. Help!!!
Also, what is the correct way to clean the throttle body? Can I just spray it or do I need to remove a sensor first. Help, i'm in over my head.
Thanks, Jay
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Old 01-01-2009, 03:26 AM
srercrcr srercrcr is offline
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Remove the big rubber air inlet hose. Spray carb cleaner on the valve just inside the body. Use your finger, flush with the cleaner. Do the front, the edge, and do the back side. Spray on up inside the body. You'll be amazed how dirty it gets. I lay rags on the serp belt so the cleaner won't contact it.
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Old 01-01-2009, 09:42 AM
dsljay dsljay is offline
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Thanks, Steve. I'll give that a shot.
Has anyone tried Seafoam on there intake? If so, which vacuum line did you use, or does it matter?
Also, I changed the fuel filter. It may have been the OE.
Thanks again, Jay
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Old 01-01-2009, 10:46 AM
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Paulford8 Paulford8 is offline
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Quote:
Originally Posted by dsljay View Post
Here is where I'm at. I'm trying to change the gas filter,BUT, I can't get the gas line off on the side that needs the tool to remove. I have the tool, BUT I just can't get it off. There must be a trick. Help!!!
Also, what is the correct way to clean the throttle body? Can I just spray it or do I need to remove a sensor first. Help, i'm in over my head.
Thanks, Jay
Jay, Srercrcr was right on with the TB. I spray the crap out of mine every once in a while and always get tons of dirt out.

Using that fuel filter tool can be tricky. Every time I change one it takes me a couple tries to get then apart!

Don't feel overwhelmed! Nobody on this board started out knowing how to make repairs. Most learned like you.... Had a problem and went after it!
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Old 01-01-2009, 11:06 AM
dsljay dsljay is offline
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Update

I changed the gas filter and the car runs about 95% better. I'll clean the TB this weekend. For now, we're off to friends for a traditional new years day dinner of pork and sauerkraut.
Happy new year to all.
Thanks for the help and support, Jay
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Old 12-27-2009, 03:41 PM
bobward bobward is offline
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Originally Posted by Paulford8 View Post
Jay, Srercrcr was right on with the TB. I spray the crap out of mine every once in a while and always get tons of dirt out.

Using that fuel filter tool can be tricky. Every time I change one it takes me a couple tries to get then apart!

Don't feel overwhelmed! Nobody on this board started out knowing how to make repairs. Most learned like you.... Had a problem and went after it!
BEEE CAREFUL which spray you use in the intae on the throttle body. MAKE SURE you only use a spray safe for Mass Air Flow Sensors.

Did this to my Taurus and wound up damaging the MAF. Immediately got the check engine light with codes. Had to replace MAF as regular carb cleaner damaged the MAF.
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Old 04-11-2010, 04:57 PM
Sikdmax Sikdmax is offline
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Has anyone tried seafoaming? Ive tried that with good results.
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Old 04-11-2010, 04:57 PM
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1991, 1994, 2002, 42, acceleration, engine, escape, explorer, f150, ford, hesitation, pressing, stumbles, stumbling, throttle

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