first off thanks for the replies, you guys have been great to me over the last year and a half
all the aftermarket add ons to this truck were done right off the showroom floor, nothing had=s been added since new and no issues till this month except for the idle up not working that happened at the end of winter. here is what i have done and have had done so far, i had the trans flushed and installed some type of expensive aftermartket fluid, this was done at the same time i had a new torque converter installed because it developed a hair line crack and was leaking. this was done about 10,000 miles ago. i thought is was the trans also, so up to ernies transmission to have it checked, he is the one that did the TC and fluid change. he was quite sure it was not the trans failing he thinks it,s due to a restricion in the engine causing it to downshift, he also checked for codes and these came up 470,475,478, all relating to the exh bp valve and sensor. he told me to check the tube and sensor, these were checked and were fine, no restricion and barley dirty, i had installed a new tube about a year ago. ,,next i read that if i unhook the ebp sensor by the hpop it may tell me if that is the problem,,,did that ,,,truck runs aliite better but still has the shifting issue,,,the part that really confuses me is it not consistent, i drove roughly 160 mile last wednesday back and forth from new york probrably 60 miles each way, i figured, if it was the trans it would do it consistently on the hills, some are 3-5 miles long and steep!! it did it once on the smallest hill because i dropped down around 45-50 mph (stuck behind two big rigs) that is the only speed that it happens. never below or above that speed....i have the new EBP sensor that i will install in the morning,,,but for some reason i do not think its going to fix it. also i have read that if you have a exhaust brake then the ebpv is supposed to be eliminated,,,is that correct?
the only time my truck sounds like a jet is when i start it and turn the exh brake on. i usually do that in the winter to heat the truck up quicker, i have not unhooked the od switch, i was told by the trans guy that the od light would flash if it was a internal transmission issue ,i will check back in the afternoon , thanks again for the insight, allan
one more question, should the idle up work at all temps or just when its cold to build heat, i remember it working when it was cold, but now it never idles up after starting.
