OK I have a post on the dieselstop page also, but no one knows how to reply there i guess... anyways.
I have a power loss with my '99 (late) SD. This has been going on for 3 years now. It get more noticable in the winter months then summer and also with rain, so I'm thinking its electrical.
Now, i get the P01249 code when it happens. I have performed ALL the checks for leaks and hoses and all looks good there.
Heres what happens.
When you start from a full stop, the truck shifts firm from 1-2, then 2-3 from 3 to convertor lock up it gets soft and by the time it gets to 4 it slides in. If you going up a hill (or overpass) in 3rd before lock up,it will not shift unless you either push the throttle harder or crest the hill. by that time, you throw the P01249. Now while all of this is going on, the truck never boosts over 12 psi (15 on the Autometer gauge). How do you get an overboost code at 12 PSI?
Some other numbers
my EBP PSI is 15 while idling, never goes above 27 when driving.
also, will not cycle until the truck is moving.
EX.I did a cold start, Oil temp was 88 and IAT was 32, no EBPV cycle. Started driving and the IAT went down to 23, then EBPV started to cycle while driving. about 5 mins.
Maybe and issue?
ICP PSI at idle 567 WOT 2600
ICP % at idle 12 WOT 39
is this low?
Fuel pressure at idle 45
I have ordered a fuel pump and will install when recieved.
Also EPC numbers
EPC PSI 5 at idle and NOT running? Why?
number will bounce from 50 when taking off then go to 23, normal?
WOT will go to 101 then go to 70 kepping the pedal in the same position
EPC voltage bounces around between 6.93 -7.29 at KOEO stays consistant with KOER 8.1 and will increase to 12.9 at WOT
I have changed the CPS last week from the grey one to the dk blue, slight change with idle (not as rough) but perdels were the same (#8 a& 4.5,#3 &1.8)
I have/can check other sensors if needed. I just need to know what to look for.
FWIW.. Back in late Sept, truck was running like a top, I can't remember the last time it ran so good. weather was low humidity and in the 60's I don't drive this all the time.
Thanks guys, Jeff