creaks and judders

BX Tech talk
image1990
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Joined: Sat Jul 29, 2006 5:38 pm

creaks and judders

Post by image1990 » Wed Aug 16, 2006 4:31 pm

Hello again everyone,

Just thought I'd consult the oracle again after you all successfully diagnosed Maud's hydraulic niggles last time round.

Firstly, I've noticed a creaking noise from the rear right-hand side particularly going round corners. Having had a worn out left-hand rear suspension bearing replaced a few months ago, I assumed the right one was now on the way out. However, the creaking has now stopped - any suggestions as to what could have been causing the noise and whether it's something potentially expensive/serious?

Secondly, I sometimes get a pretty noticeable judder when I switch the engine off, which I'm sure can't be right.

Thanks a lot - I've learnt a great deal about BX innards in a very short time thanks to this site :)

jeremy
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Post by jeremy » Wed Aug 16, 2006 5:00 pm

Is this a petrol or diesel BX - important for the judder - could be running on if petrol.

image1990
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Post by image1990 » Thu Aug 17, 2006 8:16 am

Sorry, forgot to mention it's a 1.6 petrol. Would you mind explaining what running on is? Like I said, I'm learning a lot very quickly.

jeremy
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Post by jeremy » Thu Aug 17, 2006 8:31 am

Running on is when the engine carries on running when the igniton has been switched off. Its seldom smooth and is often accompanied by heavy knocking noises.

Can be caused by all sorts - like wrong plugs, dirty combustion chambers, running hot, BMC A & B series, high idling speed, leaky vent pipes . . .

My Renault 21 was terrible for this - and would run on for about 1/2 minute when hot. I could never get the timing right so that I could get out and kick the wheel at the moment it was going to stop.

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mnde
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Post by mnde » Thu Aug 17, 2006 11:28 am

Dear Image1990,

I also have a 1.6 petrol. Apart from what jeremy suggests, you also need to check the idle-cutoff solenoid on the carburettor. Basically, you should find an electrical wire leading to a cylindrical object screwed to the carb I think underneath the brass thing on the right with the two fuel hoses attached to it. When you switch the ignition off, a plunger should shoot out from the tip of the solenoid which obstructs the fuel supply to the carb, and thus kills the engine. It is also called the "Anti run-on valve". If it doesn't function properly, you will get the judder you describe.

There are two tests: either listen for a click when the ignition is turned on, or remove the wire from the spade connector and touch it to the connector with the ignition on - again you should hear a firm click. If not, it's faulty and needs replacing, or try cleaning the electrical contact and cleaning the plunger end of the solenoid with carb cleaner.

Good luck!

Mark.
1982 Citroen GSA Spécial Estate
1997 Renault Mégane RT 1.4e
1991 Citroen BX16 TGS Meteor - gone to Scotland