Engine/Transmission (1994 - 1998) Slugish 12 valve

[mykal41]

Got a 94 12 valve here. Did a #8 plate cold air and exhaust. Moved the plate and housing foward and it just dont seem right. My 89 has more go. I adjusted the star wheel also. It smoke a little before boost but thats it. Ny other tricks I can do?

 

[fest3er]

Check the manifold to AFC boost line. When the dealer fixed my '98 12V (intake heaters failed), they said it was all fixed. When I picked it up, it had changed to a '0-60 in the same day' truck. Turns out the boost line had melted on the manifold, cutting off pressure to the AFC, which then wouldn't let much to the engine. Also re-check the AFC itself.

 

[SKnapp]

are you sure you moved it forward and not back? needs to go towards front of engine, not forward to the cab. just checking as i suppose it could happen.

 

[Joe G.]

The #8 plate is kind of weak for a '94. Should be a #5 or #6. If your AFC is hooked up the same as my '95 then the hose to it is from a fitting on the intake manifold just a little bit in front of the AFC. It would be pretty easy to just forget to hook the hose up after you replaced the plate.

 

[CogginsP]

Also if you look on the back of your AFC there will be a 10 mm nut. If you just crack that loose with a wrench, and then adjust the bolt (rotate towards the engine for more power, like everything else on the AFC) with a 3mm allen wrench it will actually move the AFC arm itself. You will smoke a lot but if you adjust it just right you will see a definite improvement. Mine is so far forward it is practically eliminated

 

[DieselTweaker]

Have you done anything with your timing?

 

[mykal41]

Not yet with the timming. I will try to advance the timming tomorow and the low end fueling. Thanks for the input guys.

 

[San Felipe Bob]

Check

Check the governor arm adjustment.



SFB