Jag jumps when changing gears

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Jag jumps when changing gears

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Jaguar >> Jaguar Models >> S-Type >> Jag jumps when changing gears

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Jag jumps when changing gears - 2/28/2007 12:59:27 PM

souldeep00

Posts: 14
Joined: 10/29/2006
Status: offline

About a week ago my gas station was out of 93 octane, which i usually use in my 2003 s-type, so I put in an octane booster and filled up with 91 octane. about three days after my fill up, the car started lurching forward whenever the car changed gears. it also happens when i slow down and the car changes gears. Should I just let all the gas/octane booster run out before refilling or should i do something else to counteract this problem...HELP. The jerking of the jag is driving me crazy and giving me whiplash.

Post #: 1

RE: Jag jumps when changing gears - 2/28/2007 1:58:57 PM

bigdreams05

Posts: 3773
Joined: 2/10/2007
Status: offline

Drive it slow and waste your gas! Then refill with Ultimate!

(in reply to souldeep00)

Post #: 2

RE: Jag jumps when changing gears - 2/28/2007 3:56:27 PM

souldeep00

Posts: 14
Joined: 10/29/2006
Status: offline

thanx big dream, I'm just praying that it is the octane booster and not a problem with the transmission.

(in reply to bigdreams05)

Post #: 3

RE: Jag jumps when changing gears - 2/28/2007 8:51:54 PM

bigdreams05

Posts: 3773
Joined: 2/10/2007
Status: offline

Hopefully it is, but there really is no cheap or easy way to find out if it is the tranny unless you take it to a shop. For that, you can just wait and see if it's the gas!

(in reply to souldeep00)

Post #: 4

RE: Jag jumps when changing gears - 3/1/2007 4:26:54 PM

racerx82

Posts: 2897
Joined: 6/6/2005
Status: offline

You can probably just keep topping off your fuel for a day or two....

(in reply to bigdreams05)

Post #: 5

RE: Jag jumps when changing gears - 3/1/2007 11:32:18 PM

souldeep00

Posts: 14
Joined: 10/29/2006
Status: offline

Well, I've let the fuel go to one mile left and put in 1/4 of a tank and still it jumps. I have an appointment at the dealer service tomorrow, lets see what they say. Its still under warrranty, so hopefully I wont have to prostitute my wife to pay for repairs.

(in reply to racerx82)

Post #: 6

RE: Jag jumps when changing gears - 3/2/2007 10:30:18 AM

bigdreams05

Posts: 3773
Joined: 2/10/2007
Status: offline

No, but it could get you some rims and nice exhaust! LOL...J/K

(in reply to souldeep00)

Post #: 7

RE: Jag jumps when changing gears - 3/3/2007 9:39:08 AM

racerx82

Posts: 2897
Joined: 6/6/2005
Status: offline

I don't think it's a fuel issue myself...sounds like your RPM's may be too high..or your ECU may have to be re-flashed....a common problem....

But, either way let us know...

(in reply to bigdreams05)

Post #: 8

RE: Jag jumps when changing gears - 3/5/2007 9:29:16 AM

Guest

It can't be the fuel. My Jag manual states the engine requires fuel of 91-premium.