K-series Engine Issues

[Chris@Nitron]

Hi ive just rebuilt a Caterham superlight, which is running standard K-series. when i start the car it sound like it runs ok for a few seconds then cylinders 1 and 4 seem to cutout and the engine sounds really rough. ive checked the plugs and they are all sparking, each cylinder is getting fuel.
im totally stumped can anyone suggest anything.
Cheers Chris

[Jack_and_MLE]

I had a similar problem a while back when I removed the OEM TB to fit some roller barrels and back again.

After a lot of head scratching and phone calls the problem was found, the fuel injector sub-loom has the same connector as something else which was not used in my car (C21). I think it might have been the sub loom for the cannister.
Swap them round and it worked


Jack

[Incorrigible]

If it definitely 1 AND 4, I'd suspect the coil pack