DZL Man
11-16-2004, 09:16 AM
I have a 2002 Duramax with an allison. I noticed driving yesterday that if the throttle is wide open, it won't shift to the next gear. It doesn't matter what gear you are in at the time, it does it in every gear. I don't have a programmer or any mods but a cold air intake. It will downshift fine, but will climb to around 3000 rpm and sit there. If you let off a little it will go on and shift,,,,,,,, Any Ideas????http://www.dieselplace.com/forum/smileys/smiley5.gif Edited by: DZL Man
Mike L.
11-16-2004, 06:36 PM
Put a scanner on it,check for codes. You might have a TPS problem.
mike
Mackin
11-16-2004, 08:08 PM
Mine does that,always had in the 4/5 exchange,only. Will down shift and just lay there untill I lift for it to shift.I have heard of many doing the same,take it for what it's worth.
Mac
ratlover
11-17-2004, 08:57 AM
Dosnt yours shift eventually though Mac? Or not till you lift and get back in her?
DZL Man
11-17-2004, 03:16 PM
I will check and let you guys know what the outcome is!! Thanks!
Kennedy
11-20-2004, 03:08 PM
How long since you changed the fuel filter?
Boombastic
12-30-2004, 07:55 AM
MY 2001 is also doing the same thing, she goes into the shop tomorrow.
renagade
12-30-2004, 08:26 AM
Ive never held my trucks peadel to the floor through all gears. The traffic here don't allow it. Mine seems good through the first three.
haas-lly
12-30-2004, 01:12 PM
mine did it through 4 to 5 and kennedy recommended i change the fuel filter, i thought yea why would that be it, well i listened to him and thats what it was. oh btw thanks kennedy!!!:ro)
Max Power
12-30-2004, 01:26 PM
Please explain this Kennedy.
Mike L.
12-30-2004, 03:37 PM
Maybe I can help answer this. At wide open throttle trans is programed to shift at a predetermined rpm. With a plugged fuel filter, engine can not reach that high of an rpm because of fuel starvation therefore no shift.
mike
_nar_
12-30-2004, 11:06 PM
Had a friend that said his 01 wouldn't shift, and it turned out his filter was plugged just like mike says. This guy had 48000 miles on stock fuel filter...
Kennedy
01-03-2005, 01:53 PM
It's funny that there isn't a fuel psi code set, but somehow it doesn't seem to.
There's a lot of 20k fuel filters out there. Would be interesting to see what the restriction is on a filter that is causing this problem.
http://www.kennedydiesel.com/images/Dmax-fuel-filter-rest.gif
bryan
01-08-2005, 10:10 AM
i'm going through the same deal right now in all gears. sucks when accelerating onto a highway.