[gregrob]

What could this be?

Trans light was flashing and truck would not shift out of second gear.

I let off the pedal and it just falls down to an idle.

Turn key off and restart, light goes off and trans shifts fine.



:shrug:

 

[Tom S]

Sounds like time to see what code got stored.

Tom

 

[gregrob]

Good idea Tom!

duh

 

[Tom S]

Hey smarty pants I can scan it for you if you get down this way. I was hinting.

Tom

 

[gregrob]

Good idea Tom!

You goin to the track tomorrow night? My buddy is gonna come down and run his Camaro. I might try to clean the truck out and run again, maybe with a different fuel pump.

 

[Racer X]

Read the code G. Anything that causes the engine rpm and axle speed to be out of range will trip the light. Hopefully easy like a solenoid, or metal fuzz on the VSS.

 

[gregrob]

No codes

 

[Racer X]

Hmm, lights suppose to set a code. Maybe reader isn't picking up pcm codes. Sticky reg valve possible, Could it be an OD start with hard TCC apply that feels like a shift to 2? Range switch could be intermitten. PcM not storing codes..., int sprag stuck :shrug: Will study it some more--late.

 

[Racer X]

A shot in the dark Greg.
SSA could be stuck on. In D range shifts would be 1 to 2 normal. Then transmission would hold 2 when PCM commands the shift to 3. You shut down. Pressure relieves, SSA unsticks. Normal operation again. Hope that helps. The 4R100 Solenoid pack has been updated since 02.

 

[gregrob]

That's what Jody at Dp Tuner said has happened to him before.

Cycle the key and the sol unsticks, life is normal.

Good call Bill

 

[Racer X]

That's what Jody at Dp Tuner said has happened to him before.

Cycle the key and the sol unsticks, life is normal.

Good call Bill

Houston, The Eagle Has Wings :fordoval::fordoval::fordoval:

 

[THEDIESELMAN]

I don't get it, so how does that unstick the solenoid?

 

[gregrob]

A shot in the dark Greg.
SSA could be stuck on. In D range shifts would be 1 to 2 normal. Then transmission would hold 2 when PCM commands the shift to 3. You shut down. Pressure relieves, SSA unsticks. Normal operation again. Hope that helps. The 4R100 Solenoid pack has been updated since 02.

I don't get it, so how does that unstick the solenoid?

RacerX can explain it better than I, but basically the solenoid gets stuck (for whatever reason) and wont come unstuck because it keeps commanding 2nd.
You shut the key off and reset the solenoids, relieve pressure, and they go back to normal and shift normally.

 

[Racer X]

RacerX can explain it better than I, but basically the solenoid gets stuck (for whatever reason) and wont come unstuck because it keeps commanding 2nd.
You shut the key off and reset the solenoids, relieve pressure, and they go back to normal and shift normally.

Well said. Shut down (key off) relieves the pressure allowing the solenoid actuator to move. A reboot of the system.

 

[Traveler]

So the pressure is mechanically holding it open, and letting the pressure drop allows it to return.

Got it.