Hi everyone


i have a slight problem with my 2005 s type


when i slow down (1 or 2 mph) coming to a light or stop sign.
If i don't come to a full stop before i accelerate, when i accelerate i feel a "lunging" effect and a slight "thump' noise


i thought it might be a brake not releasing at the same time as the other brakes


also i thought it might be the transmission not fully shifting through the cycle quick enough (the transmission performs fine, except for this situation....and it's not all the time


can anybody advise as to what it might be, and offer a solution


thanks


chris p

 

Classic signs of 'the lurch'- a very well known problem. A reflash of the transmission software might/might not fix it. There's dozen of posts on the subject.

 

Also, an ATF drain-and-fill may or may not improve the issue. As previously mentioned, research "the lurch" here and draw your own conclusion regarding how to proceed. How many miles on your odometer?

 

And to add another scenario, it possibly could be a slight vacuum leak. Have you had the codes read?

 

Thanks


just turned to 53,000 miles


chris p

 

Thanks for the info


i do have a slight emission leak


i'll that checked out first before i proceed with anything else


chris p

 

If you have the 3.0:


https://www.jaguarforums.com/forum/s...ics-faq-52720/

 

I have an. '03 so it has the ZF transmission. Lurches sometimes, but when I'm at about half way on the accelerator, when the trans shifts from 1st gear to second , I hear a " whoot" noise!

Have to get trans fluid changed soon, 79k miles now.

 

You have the classic "ZF squawk". The clutch packs are grabbing and causing your squawk due to the friction modifiers in your ATF wearing out. An ATF drain-and-fill with the appropriate fluid silences the squawk the vast majority of the time....

 

The hoot and lurch are two different dances. There's a third type which is seen at moderate speeds with a cold trans. only.

Each has a different fix.

 

ive got the hoot !!! fluid change ??

 

Do you get a knock when engaging drive or reverse from a stand still?

 

hi no no knock ? usually from 3/4th

also the car drives very well when driving normal ( steady pedal)

but if i floor the pedal the car seems to jump out of gear
( or misfire not sure ) then, searches for another gear ??

been to auto specialists just for prelim diagnosis they state its not the tc possible gear selector

any thoughts??