possible "knocking"???
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Joined: Jan 2004
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possible "knocking"???
Hi, this is my first time on this forum and don't know if im in the right forum, actually. I noticed that my 99 Super Cab with the 4.6l V8 starts to sort of "miss fire."When I hit the accelerator from a complete stop, its fine, but once I get to around 55 MPH, a spark plug or something starts to not fire correctly and I can feel the truck actually slow down and feels like its "pulling." It also slows down ALOT when im driving up a hill, something like 15 MPH drop on a hill climb, no matter how much gas I give it. Checked the spark plugs, and they are all OK, recently replaced, too, and the air filter is also clean. The only thing left on my mind to check is the fuel filter, but I can't seem to find it. Any ideas on what the problem could be? There are no high performance mods whatsoever. Almost forgot, the mileage is somewhere around 63,000 miles.
Cargo Master
Joined: Oct 2003
Posts: 2,833
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From: Jefferson, Iowa
Might be a throttle position sensor, does your transmission shift at the right poitns? Otherwise change your fuel filter, run a can of seafoam through it, and see if it still does it. Otherwise take it to autozone, and have them pull the codes, and see if anything comes up.
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will try that as soon as I replace my alternator. Yes the tranny shifts okay, just when i try to pass someone, the truck starts "pulling. "Tried fuel injection cleaners and nothing happenned. I think I need a new truck, too, mine I think is too old now, had to replace the alternator once a year ago and now I have to replace it again. For some odd reason,it broke. I went to the grocery store and noticed that the battery meter was going up and down. Opened my hood and the battery (which i just replaced a month ago with a 1000 max amps, 850cc amps battery from walmart) spilled some water, didn't explode, just leaked water. So now, I have to take care of this alternator problem, then get the sensor problem you mentioned. Thanks for the reply.
Moderator
Joined: Dec 2001
Posts: 22,436
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From: Louisville,Ky.
Hi and welcome to FTE 
I would clean the mass- air sensor before replacing the TPS sensor.
It is common for these to get dirty, and when they do, it will not read the air flow into the engine properly and it will run too lean.
Jimmy
I would clean the mass- air sensor before replacing the TPS sensor.
It is common for these to get dirty, and when they do, it will not read the air flow into the engine properly and it will run too lean.
Jimmy
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