when in top gear sometimes the revs bounce a little its an auto

 

A little, well a lot more information would be helpful. MY (Model Year), engine, etc...

 

sorry its a 2.5 s type auto 2003 car runs absolutely fine but when in top gear the revs bounce slightly thanks

 

Low on trans fluid?

Due a change anyway...

 

thanks for that its due a service next month as were holidaying all over scotland doing about 2500 miles so will get my mechanic to look at it

 

Do the conditions match this description:

'surge in excess of 150rpm during engine warm up at a vehicle speed in the region of 40mph (64.3kph) to 60mph (96.5kph)'

If so, then TSB S307-14 should be applied. This is a software 'flash' done by a dealer.

 

thats great mikey thanks for the information

 

Is there a way to determine that you need software updates outside of suspicion?

 

1. Connect the dealer tool.

Or - not for the faint of heart:
2. Read out the calibration ID for each of the modules (TCM & PCM). (Then compare with updated IDs.) If this is beyond you, see #1.

 

Need or want?

If the car is operating well, you don't 'need'.

 

yeah apart from this little issue the car runs amazing i was just a bit worried that with a 2500 mile trip it might be an issue