Jonnyonthewire

I had a very similar problem over 3 years ago (copy of my original post below) - Not been a problem since: I have had an annoying problem on my 140 sigma engine where the car idle at cold was very hit and miss for the first 5 minutes until warmed up, often stalling and needing lots of throttle blips to keep it running. It went back to Caterham under warranty just before it ran out and they "fixed it" with a remap. Since then the issue returned within days and the problem has manifested itself even when the car is warmed up. Pull up at a junction = random stall. I have seen others on forums with similar problems with spark plug changes often seeming to fix the problem. A spark plug change made no difference for me. I checked the Lambda sensor and noticed a small amount of corrosion on one of the connector pins. Cleaned that but no difference. I had also noticed a small amount of corrosion on the rear wheel speed sensor connector so I started checking all the other connectors I could find. Turns out the circular 3 way connector that connects to the Idle Bypass valve on the throttle body had one of the pins pushed back in the connector so I guess it never actually worked properly out of the factory. Removed the pin, re crimped the wire that had come off with me pulling it and reinserted it properly into the connector. Just taken the car for a hour blast and guess what. No stalling. Result. I suggest anyone with similar symptoms check this connector.

Hi Les, yes it was probably us as we did briefly stop in the layby next to Thirlmere. We were touring the lakes and camping in Coniston.

Hi Phil &Moira, good to meet you. We had a fab few days touring the lakes with fantastic weather, though freezing in the tent at night.

Not having her indoors giving me earache about spending a fortune on a toy car that keeps stalling is the great sense of achievement.

I have had an annoying problem on my 140 sigma engine where the car idle at cold was very hit and miss for the first 5 minutes until warmed up, often stalling and needing lots of throttle blips to keep it running. It went back to Caterham under warranty just before it ran out and they "fixed it" with a remap. Since then the issue retuned within days and the problem has manifested itself even when the car is warmed up. Pull up at a junction = random stall. I have seen others on forums with similar problems with spark plug changes often seeming to fix the problem. A spark plug change made no difference for me. I checked the Lambda sensor and noticed a small amount of corrosion on one of the connector pins. Cleaned that but no difference. I had also noticed a small amount of corrosion on the rear wheel speed sensor connector so I started checking all the other connectors I could find. Turns out the circular 3 way connector that connects to the Idle Bypass valve on the throttle body had one of the pins pushed back in the connector so I guess it never actually worked properly out of the factory. Removed the pin, re crimped the wire that had come off with me pulling it and reinserted it properly into the connector. Just taken the car for a hour blast and guess what. No stalling. Result. I suggest anyone with similar symptoms check this connector.

Hi Antony, yes we did wave back but you had already passed us. We were on our way to the Ladybower visitor car park but abandoned that (it was mad busy) and headded back to Castleton. You are correct that our car is the one used in the publicity shots. See you at the YoSDeNS (June will be the next one for us). John