5.4 is a dog of line help!
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Member
Joined: Nov 2002
Posts: 60
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From: rochester New York
5.4 is a dog of line help!
i have a 1999 expedition xlt with the 5.4 all wheel drive. it is a dog until 4,000 rpms cant even chirp the tires in the rain wtf! if im crusin at 45 and punch it, it jumps up like a bat outta hell. but off the line nada.... 65,000 miles on it only mod is a k&n air filter. help!
Technical Article Contributor
Joined: Nov 2002
Posts: 2,804
Likes: 9
From: Wisconsin
Possibilities:
1) Your MAF has never been cleaned
2) Your running reformulated gasoline
3) Your running 3.55 limited slip axle
4) Your fuel filter needs changing
5) Your dual exaust pipes are too big
6) The Expidition has weight over the rear wheels.
7) All of the above
I had a 5.4 in a SuperCab with 3.73 rear axle, and struggled to keep the wheels on the ground with regular gasoline.
My current 5.4 SuperCrew with 3.55 axle running reformulated gas with a dirty MAF has great traction, even in the rain.
I cleaned the MAF and returned home on a tank of reqular gas, and the tires are slipping a bit on wet roads until the limited slip kicks in.
1) Your MAF has never been cleaned
2) Your running reformulated gasoline
3) Your running 3.55 limited slip axle
4) Your fuel filter needs changing
5) Your dual exaust pipes are too big
6) The Expidition has weight over the rear wheels.
7) All of the above
I had a 5.4 in a SuperCab with 3.73 rear axle, and struggled to keep the wheels on the ground with regular gasoline.
My current 5.4 SuperCrew with 3.55 axle running reformulated gas with a dirty MAF has great traction, even in the rain.
I cleaned the MAF and returned home on a tank of reqular gas, and the tires are slipping a bit on wet roads until the limited slip kicks in.
Senior Member
Joined: Dec 1969
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From: Nor-Cal,USA
Also what size and type of tires are you running and what is your gear ratio? You may even have the 3:30 gears which are dog gears off the line they are made for fuel economy.
Richard D.
https://www.f150online.com/galleries....cfm?gnum=2479
Richard D.
https://www.f150online.com/galleries....cfm?gnum=2479
Senior Member
Joined: Aug 2002
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Don't expect to have that much performance out of your expy stock. If you're really looking for some power, get a kenne-bell for it.
Yea, if you have the 3.31 gears, you are definitely going to have a hard time on take off. Install some 3.73 gears.
Plus, I dont believe you have the P.I. heads, so don't expect too much out of it.
Yea, if you have the 3.31 gears, you are definitely going to have a hard time on take off. Install some 3.73 gears.
Plus, I dont believe you have the P.I. heads, so don't expect too much out of it.
Thread Starter
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Member
Joined: Nov 2002
Posts: 60
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From: rochester New York
thanks for the replys, i will check the maf sensor and change the fuel filter. not sure of the rear end. the tires are stock size, good years, and it is awd, but i cant even get a tiny chirp from the tires...
Senior Member
Joined: Oct 2002
Posts: 5,358
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From: Commerce Twp, MI
You will not get a chirp with AWD. For a vehicle the weight of an Expy, you would need about twice the power that the 5.4L puts out to get any slipping on dry pavement under acceleration.
