Jaguar XJ-S - S.O.S - Can you help?

[vipervisual]

Hello,
Another day another problem Love this car waited so long to buy one. Its had a full service everything checked out. Was shaky to start when purchased 6 months ago, started working properly after I cleaned the ECU connectors. However after having the suspension fixed just got it back and its cutting out and behaving very badly!
Please see the video I posted, link below. Unable to control the revs. Could it be a richness problem? Please help me.

Close to giving up and very sad.

https://www.youtube.com/watch?v=2pcOIv- ... e=youtu.be

Thanks again to all of you for your support and advice from the beginning.

[steve_m]

Don't give up!
I don't know anything about the 3.6 but others will chime in.
At least it is actually running which is a better basis for diagnosis than some that have appeared in these pages!

[davidr]

As Steve says don't give up! Its probably something fairly simple.
Does the car drive normally but misbehaves at idle? If so I would suspect the idle control has an issue. There is a stepper motor in there that could have got stuck perhaps?

[vipervisual]

Thank you for your support. Which is the stepper motor in the diagram? I am having the ECU tested.

[poprivet]

Remind us what year your car is, it makes a difference.
Best to add it as a signature.

[davidr]

The stepper motor is item 17.
As Pop says, it does help a lot if you give us the exact year and model so we can give better suggestions.

[vipervisual]

1985 3.6 xjs manual

[poprivet]

Then it won't have the stepper motor setup, the early 3.6 was controlled in a similar fashion to the V12 engine.
I'm not familiar enough with the early ones to offer much help, sorry.

[steve_m]

Check that the throttle butterfly is clean; I understand that these can get gunged up and cause all sorts of problems.
Vacuum leaks will also cause problems.
Have a browse through this, it might help.

http://www.jagweb.com/aj6eng/richness.php

[vipervisual]

I'm having the ECU tested. If that doesn't work to solve the problem is there anyone that is willing to assist me. I'm located in Leicester.
I don't know what else to do. Had it 6 months, struggling to keep trying. My mechanic is very helpful and has tried too.
Guidance needed from someone with experience.

[vipervisual]

Also no hot air coming through, not even blowing at all. Could this be linked? Was fine before.