Thread: 03 With slight miss / hesitation while cruising along.

Hi Guys,

Getting very close to the car being completed and registered. Ive got my unregistered permit and have been doing a few drives to make sure everything is in order......and it really is nice to drive.

I now have a little niggling issue that's obviously only popped its head up now that ive had a chance to drive it.

When im driving along just cruising, under very little load (im taking maybe no more than 5-10% TPS), at around 60-70 km/h the car seems to have a small miss / hesitation. Very small, but totally noticeable.

At idle the car is 100% fine, and anything over about 10% throttle yields no missing or hesitation at all, and is really smooth driving. Full throttle is a dream, with no hesitation, and nice pickup for a big heavy car. Not sluggish at all.

Im not getting any codes come up.

The only other thing that might be worth mentioning is that it also seems evident (under those same driving driving conditions), where the transmission seems to start sliding itself into overdrive, and as it does it hesitates, making it immediately pop out of the overdrive (even though it never QUITE gets there). If i hold the throttle in the right place i can get it to continue this cycle over and over......but as soon as i increase the TPS a little, it doesnt do it any more. Not sure if that makes sense, or is even relevant...?

Anyone got any ideas?. If i did buy some diagnostic software, would it even help diagnose it seeing as im not getting any codes come up?

Dave

Hi All,

Im not sure if its time to start a new thread given that myoriginal description of this issue was not correct at all.
I originally thought the issue i had was to do with theengine misfiring, but in actual fact its not this at all, and seems to be withthe transmission and the car "Hunting" when trying to go intooverdrive. The engine is running smoothly with no missing at all.
So, to go back to square one, this is the issue i have. Caris a 2003 L322 4.4 Automatic.
If im driving along, and the car attempts to go intooverdrive, it will slip into overdrive, then "jerk" for a second andwill then immediately pop out of overdrive. If i leave my driving steady, itwill continue to do this cycle over and over again.
I have attached a youtube video of what the car does so youcan see the behaviour. [ame]http://www.youtube.com/watch?v=0VfRv72xGqo[/ame]. For those ofyou that know the area, the flashing lights is me passing each overhead lightin the eastlink tunnel (melbourne eastern suburbs). The video is taken as imake the gradual climb out of the tunnel city bound.
Once i get above about 92km/h it will no longer have theissue at all, and will happily go into overdrive and stay there.
Im no expert with transmissions by a long shot (a very longshot in fact), but it almost seems to me as though (and im speaking veryignorrantly here), there is something wrong with the torque convertor lockingup, but then once it gets over that ~92km/h hour mark, it locks up fine. Improbably way off themark here, but thats the easiest way for me to describe howit "feels".
I've done a bit of searching and cant really find any otherposts with a similar issue, so im at a bit of a loss. There seems to be soooooomuch stuff electronically controlled by these cars that i fear its more of anelectronic issue than a mechanical issue.
donrover suggested unplugging and replugging the trans plugat the gearbox, but ill admit ive been having a bit of trouble finding that.
Has anyone come across any similar issues, or have anysuggestions as to what it might be?
Thanks so much to everyone
Dave