Phillip Meyer Posted July 29, 2021 Share Posted July 29, 2021 This just started while driving home from Gatwick after having another problem fixed. Sitting in traffic so moving very slowly and all of a sudden whenever I shift into second gear I get a loud rattling as if something is loose and repeatedly knocking from the back of the car, possibly the diff but when moving very slowly it almost seems to move forward. It sounds like an old-fashioned football rattle, very loud.Supposed to have a track day Monday, not looking promising.EDIT: Maybe there is a hint of this in other gears but not totally sure. Link to comment Share on other sites More sharing options...
ScottR400D Posted July 29, 2021 Share Posted July 29, 2021 What was the issue you had fixed? Link to comment Share on other sites More sharing options...
Benton Posted July 29, 2021 Share Posted July 29, 2021 Incorrectly routed handbrake cable vibrating from the diff will make a hell of a racket at certain times Link to comment Share on other sites More sharing options...
Tom_Arundel Posted July 29, 2021 Share Posted July 29, 2021 Have you got a rear exhaust box? Link to comment Share on other sites More sharing options...
Phillip Meyer Posted July 29, 2021 Author Share Posted July 29, 2021 The problem I had fixed was the lambda sensor.I don't think it can be the exhaust or handbrake cable as it only really happens in second. It is very noisy, almost like there something sticking out and catching something else as the engine/gearbox/diff rotates. Link to comment Share on other sites More sharing options...
ScottR400D Posted July 29, 2021 Share Posted July 29, 2021 It's a long shot but maybe when dealing with the lambda they've 'repositioned' 'the exhaust which is now knocking on something and the higher torque in the lower gears is exciting it. As I say, a long shot but it seems a distinct possibility, in the circumstances, that it's connected with whatever has been done today. Link to comment Share on other sites More sharing options...
Phillip Meyer Posted September 2, 2021 Author Share Posted September 2, 2021 Turned out to be a gearbox issue which Caterham cars fixed while I have been out of the country. Just back and collected the car yesterday, all seems well now and it runs like a dream.... we will see if that continues with the cooling issue... Link to comment Share on other sites More sharing options...
pgm Posted September 4, 2021 Share Posted September 4, 2021 Hi PhillipDid they modify the thermostat housing on your car?Kind regards Colin (PGM) Link to comment Share on other sites More sharing options...
Phillip Meyer Posted September 22, 2021 Author Share Posted September 22, 2021 Hi,They don't know if I have one or not so I'm guessing I don't. Waiting for them to tell me for sure at which point I will push for one to be fitted.Incidentally , after one track day and a couple of weeks sine the lambda sensor was replaced the engine already seems to hunt a little at idle. Link to comment Share on other sites More sharing options...
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