Low fuel mileage
#1
Low fuel mileage
Ok guys so my truck has turned into a dieselholic here lately it has been drinking diesel like its going out of style. Ive checked for fuel leaks and have found none the fuel filter has been replaced an air filter has been cleaned also. I just recently pulled the injectors an cleaned them an installed new copper washer an orings on the injectors an also replaced the orings on the connector tubes. What would be causing this thing to drink the fuel??? Also would a boost leak cause a dramatic drop in fuel mileage? Reason Im asking is bc Ive got what seems like a preaty good leak at were the turbo mounts to the exhaust manifold. Thanks for any help or advice
#2
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redneck_cummins (08-28-2012)
#3
#4
A bad torque converter. My 94 was getting 15-16 @ 60 mph. I replaced injectors, rebuilt the pump. A friend noted that the rpms moved more than he thought in lockup when he tramped on the pedal. we backed the tranny out for a look at the converter. It was discolored and he said a new converter would likely fix it. It did. Mileage on the next tank was 21. Make sure the valves are adjusted, new air filter . I assume it's not smoking and has good compression?
#5
A bad torque converter. My 94 was getting 15-16 @ 60 mph. I replaced injectors, rebuilt the pump. A friend noted that the rpms moved more than he thought in lockup when he tramped on the pedal. we backed the tranny out for a look at the converter. It was discolored and he said a new converter would likely fix it. It did. Mileage on the next tank was 21. Make sure the valves are adjusted, new air filter . I assume it's not smoking and has good compression?
#6
we had a customer that had a cracked manifold. almost didnt see it and really couldnt hear it. check around there and make sure. replaced with a 3 piece and bumped mileage up some for him. also see you have a edge, pull up tps percentage and set cruise, his also had a bad spot in the tps and it was constintly jumping up and down trying to maintain speed but couldnt fix on the spot it needed to so that killed mileage.
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#9
Yeah I relearned the apps after install and adjustment. I also redone my valve lash an set it back to .10 and .20. I talked to my uncle an he told me that having them set at .08 an .18 the valves probably wasnt closing all the way which he said would cause the motor to use more fuel. So I figured what the heck its free an all so I readjusted them to cummins specs. So we'll see how it does Thanks for all the replies an info guys
#10
Well guys I thought I had this mileage problem fixed but turns out I dont I just put $70 in it Thursday an it put it right above 7/8 of a tank. Well now its setting right below 3/4 of a tank an Ive only put 88 miles on it. Does the mileage an fuel usage sound bout right??? It seems to me that it should do better than that. I dont run it hard an Ive got the smarty on the mileage setting. What would be causing this bastard to drink diesel. Im to the point Im tried of it nickeling an diming me to death. I really need help here guys I cant afford to keep putting $80/week in fuel
Last edited by redneck_cummins; 09-18-2012 at 12:33 PM. Reason: typing error