Low Power?

[motormayhem]

Just got the tranny rebuilt and some stuff done to the truck (new axles with 4.10 gears) and recently it seems like it is low on power. If I remember correctly when I would punch it from a stoplight before it would take off and you could feel yourself pushed back in the seat a little. Now when you floor it it bogs till about 20-25 and then takes off and bogs a little in the bottom of 2nd and 3rd as well. Also seems to run a little rough at idle and has a little black smoke at idle when it is under load (smokes when stopped in drive but not when in neutral or park). When I hit that gas it gives a decent haze of black smoke out of the pipes. I just changed the fuel filter with no change as well as removed the air filter which didn't help either. The IP is 1 year old with about 5,000 miles on it as well as the lift pump. It seems like the engine runs better when cooler 180 and worse around 190 (which is the hottest I can get it to and what it stays at in stop and go traffic). It starts fine. I also followed the test in the TM to test the lift pump which generated 9psi after 15sec of cranking (tm said 5-6.5) and 1 pint for 15 sec on cranking (tm said 1/2 min). What could be the problem? This is kind frustrating after all the stuff I have done to it recently.

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[kenny]

Tork converter is my guess on the stall speed change and the tork converter might need to be re-clocked on the rough at idle part.

 

[motormayhem]

Tork converter is my guess on the stall speed change and the tork converter might need to be re-clocked on the rough at idle part.

How do you re-clock a torque converter?

 

[motormayhem]

Well I ran a little seafoam helped smooth the idle a little, but it still doesn't have all its power. It seem that if it sits for a little it gets it back temporarily. When I left autozone after getting the seafoam it could almost peel out of the parking lot and then it went back to bogging by the time I got to the first light.

 

[southdave]

sounds like you need to take to whoever installed the tranny and have it ajusted. you did not get a new torque converter?

 

[motormayhem]

sounds like you need to take to whoever installed the tranny and have it ajusted. you did not get a new torque converter?

The torque converter was replaced with an allison one. But it was fine the first week of driving.

 

[kenny]

If it was fine you do not need to re-clock it.
Re- clocking it is when you take the bolts out of the tork converter and turn it 1 bolt hole either way and re-bolt it to the fly wheel. it helps if the tork converter is out of ballance.

And the other part about the power issue. Try to blead the water out of the fuel block behind the filter.I do it when it is running same as I do checking the to make sure there is no air in the top bleader

 

[southdave]

also check your vacume line on the motor and tranny