Engine & Tranny problems 2

[ronmarabito2002]

I had to pull into Stewart & Stevenson in Albuquerque with engine
power problems and shift problems. It all started after we left
Dallas yesterday. I had a sudden 170 amps and 10 volts, followed by
total loss of 12 v power to instruments, radio, etc... By the time I
was off the road, the power was back. I then noticed a lack of power.
Pulled some minor grades of 2 or 3% with a drop in speed to 50 mph at
full throttle.

Nursed the unit in to Albuqerque this morning. Had a fuel gage
intermittent that went from normal to full peg on full. When making a
hard left turn, transmission check light would flash and beep.

S & S did a power check and found at full throttle, engine could only
make 1900 rpm. When backed off, the rpm went up to 2200. Just the
opposite of normal. They are very suspect of the DDEC2 at this point,
but are trying to rule out everything else first. Changed air filter,
they were started on a fuel system check when I left for dinner. I
had checked all the connectors this morning and they were fine. Could
not trouble shoot because I have no diagram of those circuits.

I know the grounds on the alternators and engine to chassis are fine.
Not sure about any others, but they are checking them.

I'm convinced that whatever caused that electrical anomoly yesterday,
damaged the ECM and it will probably have to be replaced. $$$$

Let you know more tomorrow.

R.E. (Ron) Marabito, Dallas, TX 92WB40
Currently in the shop in Albuquerque, NM