BX starting perfectly then cutting off when warmed up.

DFF53 · Post by **DFF53** » Fri Nov 06, 2009 2:54 am

In all my years so far of driving this has to be the worst . While i was driving the Citroen , the car suddenly starts juddering like hell and the revs were fluctuating +- 2500 rpm from the normal. And fuel gauge doing the same but between empty and full. I stalled three times while coming to a stop, and at one point the car stalled while i was turning narrowly missing the car in front.

I could only come to the conclusion that there is something wrong with the carb or the auto-choke. The fuel pump seemed to be pumping normally. as seen through the clear filter canister.

Luckily i managed to bring it home , rather that break down competely.
Please, has anyone had this problem or know why this might be?

demag · Post by **demag** » Fri Nov 06, 2009 5:42 pm

I had the same problem with mine just after I bought it and it was a blocked idle jet if I recall. I limped to my son's house and left it there and he took me home where I had a can of carb cleaner. I blasted it through as many orifices as I could see and then gave it an Italian tune up. Whatever it was had moved and normality returned. As you say DFF53 it can be very alarming if you are in traffic. For the price of a can of carb clean its worth a go.

DFF53 · Post by **DFF53** » Fri Nov 06, 2009 8:47 pm

Thanks will give it a go, did you have the carb off or was it still connected to the engine when you sprayed the carb clean. Being a newb, what would an Italian tune up mean?

MULLEY · Post by **MULLEY** » Fri Nov 06, 2009 9:21 pm

Italian tune up means thrashing the shit out of the car in every gear

DFF53 · Post by **DFF53** » Fri Nov 06, 2009 9:59 pm

Funnily enough thats what i thought.

Post by **docchevron** » Sat Nov 07, 2009 1:54 am

If the fuel guage was going nuts in time with the engine fluctuating, wouldn't this point towards an electrical fault?

DFF53 · Post by **DFF53** » Sat Nov 07, 2009 4:48 am

Well i thought that may be down to the way was juddering that that was happening, but i will give the carb a clean and see how that goes first.

Post by **docchevron** » Sun Nov 08, 2009 1:12 am

Ahh, I see. That said, it would have shaken your teeth out if the juddering was bad enough to make the fuel guage go ape!

demag · Post by **demag** » Sun Nov 08, 2009 9:05 pm

Yes Doc thought about that after actually

I left the carb on when I cleaned it as it looked like a 6 day job to get it off and I hadn't got much time!

DFF53 · Post by **DFF53** » Tue Nov 10, 2009 3:58 am

Well i got a can of CRC Clean R Carb and sprayed loads onto the carb before turning the car on and and also after turning the car on. And after "italian tuning" it still seems to have the problem. Perhaps it is the auto choke thats at fault.

kiwi · Post by **kiwi** » Tue Nov 10, 2009 5:53 am

Just a thought

You have a New Zealand registered BX correct? One that has Aircon?

Have you considered it to be a fault with the adjustment of the Aircon Idle screw? Reason I say that is I had an issue with over reving caused by that screw.

DFF53 · Post by **DFF53** » Tue Nov 10, 2009 7:12 pm

My car does not have AC, maybe its the CARB float problem Cam was talking about on my other thread.

Also Kiwi, i tried GSF for the FDV rebuild kit and they said that its a discontinued item. I will be getting it from a Supplier in Tauranga , he can do it for $98 + gst. As opposed to Bishops $125+

kiwi · Post by **kiwi** » Wed Nov 11, 2009 3:56 am

worth a thought anyways.

bugga about the FDV kit, still its less than $100 so really thats still better than getting a new one or a potential leaky 2nd hand one.

DFF53 · Post by **DFF53** » Sun Nov 15, 2009 7:21 pm

Well, three times so far i have started the car from cold, and it starts brilliantly at high idle of course then gradually reducing to normal idle around 650rpm once warmed up then completely cutting off. I dont really know what to think. Is there any idle cut off switch that maybe malfunctioning.. Please help!!!!!!!!!!!!!!!!!

kiwi · Post by **kiwi** » Sun Nov 15, 2009 8:21 pm

DFF53 wrote:Well, three times so far i have started the car from cold, and it starts brilliantly at high idle of course then gradually reducing to normal idle around 650rpm once warmed up then completely cutting off. I dont really know what to think. Is there any idle cut off switch that maybe malfunctioning.. Please help!!!!!!!!!!!!!!!!!

Sounds like it is idling to low? bring the warm idle up to 800 rpm see if that makes any differance.

There is another possibility that relates to the module that sits on top of the distributor. It is possible that has a fault or bad connection. You reminded me of what I was told about the 19TRS when I got it she had similer problems but I swapped the module out as I had a spare good one knocking around.