4 wheel drive

[Keith]

I have a 1991 ssr-x 2.4 tdi auto. I have just noticed that I have lost 4WD. If I press the 4WD button I get no light on the dash and no 4WD. If I move into low box I get low box but still no 4WD. I wonder if a wire has become disconnected during work to replace the head gasket? I very rarely use 4WD so it may have been missing for several months.
Can anyone suggest where I should look for dodgy connections or tell me if there is a fuse that might be the cause (which and where).

Any suggestions would be greatly appreciated.

Keith

[Rob]

I think Koi had a similar problem after changing the head. Was to do with vaccuum pipes if I remember rightly - hadn't been put back.

[da SLUG man]

I think Koi had a similar problem after changing the head. Was to do with vaccuum pipes if I remember rightly - hadn't been put back.

this could be handy to know!! low ratio in 2wd!! good for donuts!!

[Keith]

Spent an hour or so investigating this problem with my son who is a bit more mechanically minded than me. The front wheel drive is added to make 4WD as a result of a vacuum being applied to a thingummy on the front axle. The vacuum comes from two wotsits on the top of the inside wheelarch about level with the turbo. If we suck on the pipes which run from the wotsits to the thingummy we can engage and disengage 4WD. Each wotsit includes an electrical hoojah the purpose of which is unclear. They may include a piston to create the vacuum needed or may simply regulate a vacuum supplied from elsewhere. We suspect that one of the wotsits is goosed.
Does anyone have a source for spare wotsits or are they as hard to get as flux generators and rocking-horse muck?
Does anyone know if a vacuum is supplied to the wotsits?
All is confusion

Keith

[da SLUG man]

Spent an hour or so investigating this problem with my son who is a bit more mechanically minded than me. The front wheel drive is added to make 4WD as a result of a vacuum being applied to a thingummy on the front axle. The vacuum comes from two wotsits on the top of the inside wheelarch about level with the turbo. If we suck on the pipes which run from the wotsits to the thingummy we can engage and disengage 4WD. Each wotsit includes an electrical hoojah the purpose of which is unclear. They may include a piston to create the vacuum needed or may simply regulate a vacuum supplied from elsewhere. We suspect that one of the wotsits is goosed.
Does anyone have a source for spare wotsits or are they as hard to get as flux generators and rocking-horse muck?
Does anyone know if a vacuum is supplied to the wotsits?
All is confusion

Keith

that's almost as clear as the last time i called the number 118118!!

[Koi]

Yes lost my 4 wheel drive after the head was replaced. Was two vacuum pipes that had been forgotten, across the top of the engine is the metal tube (got 2LT or 2LTE on it) attached to this and running parallel with it is a little metal tube that should have a rubber vacuum hose atttached to each end. This is what i forgot to attatch, attached tubes both ends and 4 wheel drive engages now, simple as that.

[TonyN]

There is also a vacuum solonoid on the rear of the transfer case, this often jams if not used for ages. This and the ADD mech needs to be engauged for the light on the dash to come on.

Also a relay under the dash near the steering column.

[Keith]

Thanks to Koi and Tony 4WD has been restored. The problem was that a vacuum pipe to a T piece on the vacuum pipe joining the thin metal tube Koi referred to had not been connected. This provides the vacuum to the 4WD actuators as well as other gizmos to the right of the engine block. Why have I not noticed any other problems?
Keith

[Linda]

Thanks to Koi and Tony 4WD has been restored. The problem was that a vacuum pipe to a T piece on the vacuum pipe joining the thin metal tube Koi referred to had not been connected. This provides the vacuum to the 4WD actuators as well as other gizmos to the right of the engine block. Why have I not noticed any other problems?
Keith

Arn't they little STARS!!!!

[Scubasurf]

I sure it was because the flux capacitor was connected to interdrive pump on the positive side. Try connecting it to the reverse intake.

[TonyN]

Arn't they little STARS!!!!