My low mileage (46K) Jaguar V12 suddenly stopped changing up from 1st gear (it's an automatic - I think a GM300 box as used in Cadilacs of the time). Can anyone suggest why this might be? athe auto-transmission fluid level is fine. I'm very worried about it as the car is much bigger than my wallet, if you know what I mean !
I'm not sure if it could be related but it stopped changing gear after I opened the bonet and flexed a rubber bellows thing at the top of the engine, and also manually clicked a micro-switch which is attached to the throttle cable, again at the top of the engine. Slapped wrist for tampering!
PLEASE HELP !!!!!!V!!!!!!
2007-03-17 03:34:52 · 7 answers · asked by Ad Cas 2 in Cars & Transportation ➔ Maintenance & Repairs
It should have a three speed automatic TH 400 I would say the vaccuum modulator hose came off it. this would keep it from shifting, check engine side and/or transmission modulator.
2007-03-17 03:50:10 · answer #1 · answered by Henry G 2 · 1⤊ 0⤋
Try a "re-set" by disconnecting the positive battery cable for five minutes or so, then reconnect and fire the motor let the engine warm for a few minutes, then give it a go.
If not effective, do you notice any unusal "clunking" when changing from park to drive? Then, it is probably loose bands int the AT- a visit to a good shop will be needed.
2007-03-17 03:42:05 · answer #2 · answered by Halcyon 3 · 0⤊ 0⤋
Vacumm pipe probably come off the modutator that controls the upshift
Modulator situated either on the rear or the side of the transmission
2007-03-17 03:48:40 · answer #3 · answered by Anonymous · 0⤊ 0⤋
if the gears are working when manualy selected then possibly the problem is that the throttle pressure is not being directed to the modulator valve.check for any any disconected vacume pipes and bad connections.the micro switch you refer to is relative to the kick down
2007-03-17 04:05:06 · answer #4 · answered by Anonymous · 0⤊ 0⤋
it must be dampness getting around your plug wires. carry the hood at evening whilst it rather is working tough and seek for sparks around the plug wires. they often leak close to their boots or the place they flow. it may additionally be a foul gas mixture from a leaky vacuum hose, or a foul air filter out. one way that I even have used to envision for damp wires is a product talked approximately as W-D40. i do no longer understand in case you have it by making use of that call. it rather is a silicone lube spray that displaces water. it rather is nonconductive. no remember if it rather is moisture on the exterior of the plug wires spraying with W-D 40 will eliminate the moisture. If that ends the problem then you understand it rather is from the wires. yet another straightforward verify is to verify the plugs. in the event that they're grimy or worn that often is the problem. plugs are particularly low-priced to interchange. the undeniable fact which you point out the chilly climate makes me think of it rather is moisture condensing on the wiring.
2016-12-18 16:02:01 · answer #5 · answered by allateef 4 · 0⤊ 0⤋
you need a repair on the box early autos do suffer from this,
and the Manuel's do to!
you should find someone local to do this! but not cheap!
yellow pages?
2007-03-17 03:40:23 · answer #6 · answered by witheringtonkeith 5 · 0⤊ 0⤋
try getting the torque converter checked out
2007-03-20 08:45:07 · answer #7 · answered by bhuda1969 1 · 0⤊ 0⤋