Engine/Transmission (1998.5 - 2002) Bad milage

[JWhitehead]

I used to get 16mpg city and 20mpg hwy,

Now I get 10mpg city and 13 hwy,

I replaced fuel filter,air cleaner,fuel supply pump,map sensor,

I have a 1998 24v 4*4, TST power max 2,Banks 4'' exhaust, Percision tripple plate torque converter and shift kit, turbo elbow,

 

[Turbo Tim 1]

How about the IAT sensor? I consider it routine maintenance to change it out ever year, it's only 20-30 bucks (cost me $27 the last time) and I usually gain 2 mpg or more. Some people have had good luck just cleaning it but I never did.

 

[Whitmore]

J, what did you do to the truck just before the mpg went south??? I was going to sugest a MAP senser change but I see you have done that, I would also clean the IAT senser next to the MAP, I dont know if it will help but its worth a try. What kind of psi is the new pump giving you? A bad L/P can cause bad mpg.



cheers, Kevin

 

[Diesel Nut]

I've noticed my mileage starting to go down too, and can't figure it out. When the truck was new I got 16 city, 18 highway, and about 14 towing. Now I am at 16 highway, 10. 5 towing, and only 27K on the odo.

 

[Rockcrusher]

where is the IAT senser located? My milage is bad too, maybe I should check that.

 

[Turbo Tim 1]

It is on the drivers side of the engine back behind the MAP sensor, it is hard to see and somewhat hard to get to but after you do it once it is a 5 minute job the next time. If you search for IAT you will find tons of information and maybe even some pictures. The IAT sensor is probably the #1 thing to do to improve mileage, it was for me.

 

[Behr]

Hiere is link showing you where the IAT sensor is Rockcrusher...



Hope this helps.....



http://www.dodgeram.org/tech/dsl/sensors/IAT/clean.htm