citroen xantia 1.8i 1997 'R' 2 faults

on behalf of someone else.
fault one: when the xantia is switched off it sinks at the back
fault two: sometimes, after a run, it dies at the traffic lights.
the car was given free of charge and is visually in A1 condition.
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. (-@-.com) gurgled happily, sounding much like they were saying :

Anti sink sphere flat? Brake valve leaking back to the reservoir internally.

Check for air leaks between head/inlet manifold/ducting/air flow meter.
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Adrian wrote:

I'd guessed that.

didn't guess that. will pass it on as the xant is used to carry 2 kids

a pipe off or something deeper ?
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Fault 1, will be an internal leak back to the reservoir, the most common suspect is the brake valve, but it coule be a suspension cylinder.
Dont be fooled into thinking that a brake valve return fault will make the car unsafe, because it dont!! Sounds daft but true. The rear brakes take the pressure off the rear suspension, therefore the more weight in the boot, the more pressure is in the rear brake curcuit, if the brake valve has a return fault it will not effect the braking at all, it simply makes the back end sink when parked up. Your brakes will still work fine. if you want to change it, and you will eventually as you will get fed up with the sinking, check out the on line shopping at www.citroen-hydraulics.com
The anti sink sphere may or may not need changing (and all the others if they havent already been changed) but changing the anti sink sphere alone will not be a cure if the car has a leak back.
Fault 2, I would guess at the idle speed stepper motor, Take the thing out and give it a good spray with carb cleaner and while you are at it, clean the throttle body inside with the carb cleaner, this needs doing on the Xantia from time to time and it will make a hell of a difference.
Regards Slim.
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Slim wrote:

cut, pasted and printed out for the benefit of the lady in question.
thanks slim.
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. (-@-.com) gurgled happily, sounding much like they were saying :

It's not a safety issue.

Just an air leak, allowing unmetered air in, meaning the mixture is far leaner than the car thinks.
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