Help Fix My 4mpg issue
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Help Fix My 4mpg issue
hey i have a 94 dodge 1500 318 with the nv3500 ive replaced the injectors replaced thermostat cleaned throttle body replaced all sensors related to throttle body the only thing left i can think of is the phlenum gasket but i dont have any vaccum in the crankcase which is supposedly the sign of bad phlenum gasket it does run rich i change the plugs guys i need some help i have NO idea what to try now the best mileage i got was 6 and that was 55 on the highway it also runs smooth and idles great besides the mpg this is a great truck please help
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No we checked for dragging brakes all spin freely until the pedal is pressed
Yes it is a dual exhaust with thrush welded mufflers and it has the cat deleted
The axle bearings spin fine and the air cleaner was replaced as soon as i got the truck
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If all you said is true, the plenum would be the next check. There's no "sure fire" test for the plenum. Some people have crankcase vacuum (I did) and some don't. Some see oil at the bottom of their plenum on the belly pan (I didn't) and some don't. Only real way to find out if it's blown is to pull it and look. If it's stock and has never been opened, chances are better than if a bear sh*ts in the woods that it's blown. With these engines, it's not an 'if' they blow, it's a 'when.'
If the mileage is still poor after doing the plenum, I'd suspect a gas leak somewhere.
If the mileage is still poor after doing the plenum, I'd suspect a gas leak somewhere.
Last edited by audiomechanic; 12-10-2010 at 02:04 PM.
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