1995 T100 4x4 A/T 5vzfe 130,000mi.


My CEL came on again this week, twice in 3 days. I assume the codes are still PO773 and PO770 re: solenoid E.
About 4k after the dreaded Tranny Flush... the CEL came on and after much research, I had some BG tranny product poured in. Problem solved, no more CEL, except maybe once or twice in 3-4K miles. Now it seems to be rearing its ugly head again that my tranny ain't happy. It's been about 8K since the tranny flush. Truck seems to shift normal (slight observation of occasional wierd shift in O/D shift region.)

My questions are:
-Should I change tranny fluid again now?
-Should I just dump some MORE BG in with the idea that all the crap that may be swimming in the system might get broken down furthur? How much of this stuff can you use before you must change AT fluid?
-Should I drop the pan and clean the filter?

Any thoughts are appreciated!
thanks

In case I missed it, what ever became of your problem?

Changing the shift solenoid would probably be the next step.More snake oil is not the answer.

172k miles now.
I changed the solenoid in 2005, now, the same code po773 comes on everytime I start the truck. I just clear it with my code reader and everything is perfect. I probably didn't need to change the solenoid, but I wanted to be sure. I asked the stealership tech why the CEL still comes and he said it's a bad ECU. He had a tech with the same truck swap his into my truck and the CEL stayed off. He said go find one in a junk yard that matches. I haven't found a reason to do that yet, because the code reader works fine to get rid of the CEL. Incidently, the CEL still works properly. It picked up a low antifreeze code after I had a tranny cooler installed. I've driven all the way to Loreto, Baja MX and back twice since the solenoid change. NO PROBLEMS. I'm still interested in finding out why and ECU would go bad like this.

Low antifreeze? Our trucks don't even have a sensor for this... and there is no DTC code for it either. Same goes for transmission fluid, IIRC. <img src="/forums/images/graemlins/confused.gif" alt="" />

Yeah, "coolant level" I believe was the wordage in the description on the code reader. Filled the overflow resevior to the indicated level, and the code never came back. Whaddya know?