Whats wrong with my truck?

[SFord]

The other nite I was returning from the Gatornationals drag race and was tooling home on I-75 when the truck started to act like it had a slight miss around 70 mph or 2200 rpm. It felt in some ways like one of the tires was out of balance but I periodically took my foot off the throttle and the sensation would go away. The truck would respond to more throttle ok but when I got back in that range it would act up again. It ran ok going home but it seemed to just have the problem in that speed or rpm range. I have since had it on the highway again but was unable to reach that speed on the in town by-pass. Truck ran fine though. Anybody have any ideas.

 

[DSiemens]

Have you changed you fuel filter?

 

[RJOL]

Could be the lift pump... If you had a fuel pressure gauge you'd be able to confirm or eliminate the pump or filter...

 

[ToolManTimTaylor]

Mileage??

If it happens at ONLY that speed (Roadspeed) I would also check U~Joints as a just 'cause. <hr>

Truck Bio:

Y2K+1 3500 4X4 Quad Cab 4:10:1 LSD



Powerpack By Bank's (4 inch exhaust,High ram intake,wastgate mod to 38 psi,ottomind TLC +guages,K&N) ,DTT~93%TC~&~VB~TC Smart controller, Mag-Hytec's Double Deep Trans pan,DD injectors+Van Aken+Autometer Guages. ,Piers Modified PDR HX turbo,Enterprise Engine PerformancePusher pump setup Front End Leveling Kit from Jakit with 255/85R16 BFG http://www.bfgoodrichtires.com/ M/T's Custom Rhino Liner (see Tool Man's truck feature)DeeZee Black Diamond Plate Bed Rails And Tool Box , WAAG Side tubes with kick~outs Mopar Performance accessories-Sill plates-hitch cover-cargo aux lamp'n'Power, Hadley air systems 150 psi comp and air storage. DynaMat Sound deadening applied to entire cab and doors, Check out Tool's Stuff#ad


N. E. T. D. P

 

[SFord]

Fuel filter has about 5000 mi. on it. That is what I was wondering if the lift pump could possibly be going south. Guess I better invest in a gauge to check it out.

 

[Shooter]

The fuel filter is probably not your problem. That bieng said: It takes 1 min. and no miles to ruin a fuel filter with bad fuel. Always carry 2 spare fuel filters. One load of bad fuel can plug the filter quicker than yesterday. It might take 2 filters to get you to the next exit on the freeway,if that far, and no further. If you do get a batch of bad fuel, the tank must be dropped and cleaned out and probably a new pickup screen.

I have seen tanks with a couple inches of water, or other chemicals and rust, sand, dirt... ... It is ugly

 

[EShaw]

SFord,

Wash the underside of your truck... ... ..... Probably mud on your driveshaft... ... ... ..... or your problem is driveline related.

Eric

 

[Challenger-II]

My truck just started to do the same thing!! Mostly pronounced around 65-70 mph. I just rotated my tires and felt that might have had something to do with it. It doesnt feel like a miss, more like an unbalanced tire. Keep us posted on your outcome.

 

[SFord]

Challenger-II, I had just rotated my tires as well a week prior to this trip out of town. This was the first time it had been on the highway at that speed. To me it felt as though it was a balance problem but when I looked back it didnt seem to do it on the way up to Gainesville or may I was traveling at a greater speed. Anyway I'm going to have the tires rebalanced and will post outcome. Thanks for the post... ...

 

[Challenger-II]

SFord... . I hope it is a tire thing. I have noticed that it has diminished since I've been putting on the miles. I can definately say it started when I rotated the tires. Let me know your outcome.