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| I have an old classic 1985 peterbilt with the 425 3406b in it. Having lots of trouble with soot on startup and even revving while engine is warm. Also, not a whole lot of power...as compared to what legend has it for this model. I really dont wanna run much higher than 70-75 just want the power to pull the hills with out having to downshift a whole lot. Ive got the old 15 speed with 455's in the rear. I asked a mechanic last week to turn the fuel down a little to see if it would help my economy at all...and ended up with same amount of soot and dropping from 5.3 mpg to 4.8. I heard i can get up to 6.5mpg if set right. I know its simple to open up the air/fuel mechanism on the back of the pump...just need to know steps to adjust it properly. Also any other hints or tips would be great. Ive checked turbo and clamps throughout air cooler system. Also had diphram in the injection pump checked. I am leaking a little oil right at the throttle lever on the side of pump and right at the cylanoid. | |
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3406 b air/fuel ratio pump adjustment
