S80 Kick Down Problem

Has anyone experienced this before? 1999 S80 Auto 2.9 85k mile.

When I do a kick down, engine accelerates fine to 4.5k revs then suddenly
falls back to 2k revs and then starts accelerating again to 4.5k revs
etc.... Any ideas would be appreciated.

Was peviously working fine until today.

Paul

 

Maybe the throttle position sensor is not working right. Just a guess.

Spanky

 

Paul,
I had this EXACT same issue with my 99 S80-T6 when I first bought it.
When I floored it the thing would wind out then act like I was pulling
my foot off the gas then stomping it again. I called it power surging.
It took Volvo forever to figure it out after I got them out of the
denial mode. It's been a while since this all happened but if memory
serves me right I'm 99.9% sure it came down to a software issue. This
would probably explain why it happens in both the 2.9 and my T-6. The
problem was fixed. Hope this helps.

Don

 

Thanks - seems to be OK over the last few days - although engine noise has
increased greatly. My guess is that the engine somehow thought it was in
third gear and was limiting revs and maximum revs accordingly.

 

This usually indicates either a dirty throttle module or the throttle module
is starting to go bad there is a software upgrade to upgrade the engine
control module 30677021

--
"*-344-*Never Forgotten"
Is for the New York City Firemen who lost their lives on September 11,2001.
The official count is 343, but there was also a volunteer who lost his life
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nor should any American.
"Mow Green"