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Old January 31st, 2010, 01:15 AM   #1
codyjames
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Default slow with a load

88 4x4 4.9 5 speed f150 seems to be a dog when i have people in my truck like over 300 total pounds or if i have my quad in the bed is it possibly an egr or something like this ?
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Old January 31st, 2010, 01:39 AM   #2
MilwaukeeF350
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What gear ratio in axle?

3.09 or 3.55 ? Is tires stock or oversize?

How many miles on it?

Sound it due for tune up. What timing it set at?
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Old January 31st, 2010, 01:41 AM   #3
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look on the front of the grill answer is circled

could be a few thing

start with easy to check and cheap if it is questionable and should be replaced anyways

Fuel Filter
Tune up (cap and roader really dirty) or fouled plugs burnt wires
clogged cat
banana in the tail pipe


EGR would usually run like crap no mater the load or fun good cold then like crap when warm kinda deal
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Old January 31st, 2010, 02:33 AM   #4
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look on the front of the grill answer is circledl


tune up, and oversize tires?
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Old February 1st, 2010, 12:19 AM   #5
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i did a tune up about 6 months ago it only has 32's not sure of gearing but it picks up better when its just me in the truck but it can be a dog when there is a bit of weight in it , been like that even when it had stock tires on it
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Old February 1st, 2010, 12:20 AM   #6
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about 156,000 sounds good minus collector leak no knocks or ticks at all
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Old February 1st, 2010, 12:28 AM   #7
MilwaukeeF350
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Ok what axle code number say on white sticker on driver's cab?
12 2.73 3800 FORD REG 1991
17 3.25 3300 FORD REG 1971
17 3.31 3800 FORD REG 1995
18 3.08 3800 FORD REG 1991
19 3.55 3800 FORD REG 1991
25 4.10. 5300 FORD REG 1991
29 3.55 5300 FORD REG 1991
35 4.10. 6250 FORD REG 1991
36 3.73 7400 DANA REG 1980
39 3.55 6250 FORD REG 1991
45 4.10. 7400 FORD REG 1991
49 3.55 7400 FORD REG 1991
65 4.10. 8250 FORD REG 1991
69 3.55 8250 FORD REG 1991
72 4.63 11000 DANA REG 1991
73 5.13 11000 DANA REG 1991
H5 4.10. 3800 FORD LIMITED SLIP 1991
H7 3.31 3800 FORD LIMITED SLIP 1995
H8 3.08 3800 FORD LIMITED SLIP 1991
H9 3.55 3800 FORD LIMITED SLIP 1991
B5 4.10. 5300 FORD LIMITED SLIP 1991
B9 3.55 5300 FORD LIMITED SLIP 1991
C5 4.10. 6250 FORD LIMITED SLIP 1991
C9 3.55 6250 FORD LIMITED SLIP 1987
D5 4.10. 7400 FORD LIMITED SLIP 1991
F5 4.10. 8250 FORD LIMITED SLIP 1991
W5 4.10 8250 FORD LIMITED SLIP 1995


If you have 12 or 18 it suck. They are for highway not tow.

what rpm are you shift at? It like shift when you are reach 2,200-2,500 but don't shift pass 3,000 rpm it isn't good for 4.9L
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Old February 1st, 2010, 12:29 AM   #8
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i did a tune up about 6 months ago it only has 32's not sure of gearing but it picks up better when its just me in the truck but it can be a dog when there is a bit of weight in it , been like that even when it had stock tires on it
check out the gearing, it may lead you somewhere. 6 months ago? if you drive it everyday you might need another one. motorcraft plugs?
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Old February 1st, 2010, 05:55 PM   #9
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yeah motor craft
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