Stumbling F150
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Stumbling F150
I have a '99 F150, 4.6 V8, 98,500 mi. It's been a great truck, but it has been stumbling under acceleration. The RPM's don't lead me to think that the transmission is slipping,(it doesn't rev up erratically, then go back down when it grabs the next gear), but feels like someones pulling back on it then letting go, then pulling and letting go, and so on. It also stumbles when it trying to downshift. I've been told that it may be a clogged EGR, but would like another opinion. Thanks.
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From: Steamboat Springs, CO
That's odd - My 99 just started doing the same thing last night. It's been parked for a few weeks in my garage but other than that nothing has been done to it recently. I have 110000 miles. Just changed the plugs and fuel filter about 5000 miles ago. I'm thinking maybe plug wires? I have a 5 speed tranny so it's not the tranny slipping... kind of feels like a missfire. I'll have to look into the possible EGR issue. Could it possibly be a bad injector? Any ideas??
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Thanks for the reply, I have not changed my plugs yet, but I know that it is time. I had the transmission serviced a little over 10k ago, as well as the fuel filter changed. Mine sits in the drive most of the time because I have a company truck, but it started before then, when it was my everyday vehicle.
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From: In the garage
Ohj,
Just went through the same thing with my 01 Screw w/168,000 on it. I orig thought the tranny was going out. I changed the fluid and filter and it was still doing it. When the truck was cold it would run fine, then when warmed up it started to do exactly what you described. It never produced a CEL or a code.
I changed the spark plugs and all the COP(I don't think you have these) and it is running like a top. Hope it's as easy as this for you. Good luck
Josh
Just went through the same thing with my 01 Screw w/168,000 on it. I orig thought the tranny was going out. I changed the fluid and filter and it was still doing it. When the truck was cold it would run fine, then when warmed up it started to do exactly what you described. It never produced a CEL or a code.
I changed the spark plugs and all the COP(I don't think you have these) and it is running like a top. Hope it's as easy as this for you. Good luck
Josh
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Thanks for the input, I will get it scheduled to have the plugs changed. I have heard the the way these are positioned, that unless you are a mechanic you don't want to try it. I try to do all the maintenance stuff myself, but I was warned against trying this. Was this your experience or am I being sold?
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From: Steamboat Springs, CO
Yes -we don't have COPs -
I changed the plugs in my 99 4.6 after reading a bit here how to go about it. It really wasn't as bad as it sounds. You do need to have a collection of socket extensions and universals and a lot of patience. I think I;ll check all my plugs and replace the wires. 0I was wondering if there might be a code on this or not... guess not.
I changed the plugs in my 99 4.6 after reading a bit here how to go about it. It really wasn't as bad as it sounds. You do need to have a collection of socket extensions and universals and a lot of patience. I think I;ll check all my plugs and replace the wires. 0I was wondering if there might be a code on this or not... guess not.
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From: In the garage
Ohj,
I was easier than what has been discussed on this forum. It took approx 4 hours. Make sure you have a swivel and several extensions. Look at the link I am putting at the bottom of this and it will help. I would do it myself if I was you. I'm not mechanically inclined, but had a fun time doing this, and I'm sure it save a little bit of money.
Josh
https://www.ford-trucks.com/article/...ter_F150s.html
I was easier than what has been discussed on this forum. It took approx 4 hours. Make sure you have a swivel and several extensions. Look at the link I am putting at the bottom of this and it will help. I would do it myself if I was you. I'm not mechanically inclined, but had a fun time doing this, and I'm sure it save a little bit of money.
Josh
https://www.ford-trucks.com/article/...ter_F150s.html
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Just had the same thing happen to my 97 4.6l with 310,000km. was the wires but the spark plug wells were also filled with water and dirt. Just make sure you blow out the wells before removing the plugs as all that crap will fall into the cylinders. Wires solved the problem.
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From: Steamboat Springs, CO
Good to here wires solved your problem 69gaugeman. That was my 1st inclination to solve this. It was real weird cause it started happening while I was driving home in a blizzard on slick roads last night. We were wondering if we were just spinning the wheels or something... but when I couldn't get the wheels to break loose when I tried to we figured it was some engine trouble. It's funny cause this has been such a trouble free engine for 110000 miles. Thanks.
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Maybe snow was blowing up into the engine compartment then melting? Mine would work fine but whenever it got wet in there it would misfire. My check engine light would always come on and always told me which plug wire was wet though...
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Joined: Aug 2002
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From: BC, Canada
For some pictures to go along with the article that macjb mentioned take a look at https://www.ford-trucks.com/forums/1...ark-plugs.html