allison loosing pressure overnight

[mark g]

hey guys, ive had my d/a since dec and i just have 6k miles. the problem is that after sitting a week in the drive, after firing it up and putting it in reverse, nothing for about 8 seconds, then it finally catches, fine the rest of the day in forward and reverse, shifts perfect.low pressure? leak down? anybody have this experience? help! it has to sit at least 3 days before it does this, also never had this problem before. thanks.mark

[NutNbutGMC]

^... "Overnight"??? Sitting for a week??? Which is it. It makes a difference.

[mark g]

not overnight but on the third day, sorry. ive only noticed it one other time after sitting 3 days. so what gives?

[dcpdave]

mark,
if it only does it after sitting a few days, then it's probably a "converter drainback" problem. g.m. is currently working on a fix. this issue has come up in the last couple of months, so it may take g.m. a little while to find a resolution. in the mean time, when you start it after sitting a few days, let in idle for a couple of minutes. if you put it in gear too soon, and it doesn't shift, it may turn on the ses light. if it does, shut the engine off for a minute, then start again, it should be ok then, and the light should go off. contact your local dealer and explain problem to them, have them call you when a fix is available.
hope this helps.

[NutNbutGMC]

^...What dcpdave said. smile.gif Thanks Dave.

[mark g]

thanks guys, figured something like that. tongue.gif tongue.gif