Fuel Adjustment

[Ewright]

I've adjusted my star nut 3/4 cw in and my smoke two turns cw but am noticing a real lag in power in the first part of third gear. It pulls fairly hard in 1st and 2nd put really falls off when it shifts to third and finally picks back up toward the shift to OD. It's not real noticable except when your stomping on it or passing. Also I have to put the trans in N for a while when I first crank it or after it's been sitting for over an hour, if I don't it takes a while to go into gear. On top of that the shift from 3rd to OD takes a while to happen if I'm stepping on it unless I left off and let it shift then get back on it. All this being said I wonder if It is more the transmission than a missed adjustment of fuel, any thoughts?

 

[Bob Beauchaine]

First thing you need to do is to make sure that your transmission is full - low transmission fluid will cause the cold problems you've posted. The truck needs to be warmed up to normal operating temp. , on a level surface and in neutral. If it needs any fluid add some then go through all the gears pausing for about 30 seconds in each one then repeat the above level checking procedure. If this does not solve your cold delayed engagement then at the very least a band adjustment is in order. It's been a while since I've adjusted bands but the job is not that difficult. I can walk you through the steps after I get the torque values for you.



You slush box drivers might want to jump in here if I have missed something. Once the above is done see how it's working then go from there.



Bob

 

[cerberusiam]

The converters drain back into the pan when they sit for a while and when the trans is in park the fluid does not circulate. I always kick the trans into neutral as soon as the engine fires to start circulation and warm things up. Once you get over 50k on the trans the seals are starting to harden so when the fluid is cold you get blow by on the clutches when hitting a gear from dead cold. Once the fluid warms things should return to normal. The outside temp will have an effect on how pliable seals are even if they are so warming the trans is a good idea. If your shifts are firm and there is no runaway upshift or dead lag between them I would not worry too much a trans problem. The late shift to OD could be a couple of things. The TPS may be set high or the signal is weak from it, trans throttle pressure cable too aggressive, high idle stop to high. It all depends on where you want the OD to shift in. The later the better to save the OD as it is a weak point has been the consensus.



I take it that you turned the star wheel down some to fuel earlier so not exactly sure what the 3rd gear problem could be. Are the rpm's dropping and the motor bogging or are you feeling a lack of acceleration when it shifts to drive? The converters are fairly sloppy on the stock trans so much more power than stock and you end driving right thru the stall speed and losing power. How is the shift from 2nd to 3rd? Fast, slow, any hangs or jumps in rpm? How is the shift to OD? Throw your observations out and someone has probably had the same problem. Good luck.

 

[dpuckett]

HTis may be a dumb question, but when you turned your starwheel down 2 turns, did you put the diaphragm back in the same posistion? If you werent paying attention, you could have put it in a "leaner" position. Turning that pin from Stock (about 50-60%) to max will give you more bottom end, but may drop intown mgs, due to fuelling coming on more, earlier. CLear as mud? Thought so, as it should be . Just kidding. Do a search, and you should find a couple threads on the subject.



Daniel