Rhys Mann Posted May 30, 2023 Share Posted May 30, 2023 My Caterham isn't logging it's mileage correctly, and is under recoding and was wondering if anyone would know why this would be happening? I did 124 miles this week but on the cars tracker and on Strava it showed 202 miles! Could this be an issue with the speed sensor or the odometer itself?thanks in advance :) Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted May 30, 2023 Member Share Posted May 30, 2023 What model of Seven? Which type of speedometer drive? Guide to Speedometers.Is the speed indication OK?Has it ever recorded distance correctly?Jonathan Link to comment Share on other sites More sharing options...
SM25T Posted May 30, 2023 Share Posted May 30, 2023 Switches in back of speedo unit need correcting Link to comment Share on other sites More sharing options...
John Vine Posted May 30, 2023 Share Posted May 30, 2023 Your other posts suggest you have a Sigma?If so, have a look in Part B of the Speedo Guide linked in #2. Check the sensor air-gap.The other possibility is that you've somehow corrupted the pulse code setting. Part C covers that.JV Link to comment Share on other sites More sharing options...
Rhys Mann Posted May 30, 2023 Author Share Posted May 30, 2023 Thanks for the replies all! ill give it a go :) Link to comment Share on other sites More sharing options...
Rhys Mann Posted May 30, 2023 Author Share Posted May 30, 2023 Hi John,It is the Sigma engine and the sppedo looks like this one, have checked the pulse codes which are ok, so I guess the next step is to check the sensor air gap?thanks Link to comment Share on other sites More sharing options...
Amos91 Posted May 30, 2023 Share Posted May 30, 2023 Yeah see if the sensor lights up (ignition on) with each tooth on the O/S driveshaft rotating. I had this but knew there was an issue as the speedo was struggling to display at higher speed. Link to comment Share on other sites More sharing options...
John Vine Posted May 31, 2023 Share Posted May 31, 2023 #6. Yes, as per #7. Follow the procedure set out in Part B. If you can measure it, please tell us the actual gap.Are the speed readings reasonably accurate across the range, or do you see odd behaviour at higher speeds?JV Link to comment Share on other sites More sharing options...
LazerBrain Posted May 31, 2023 Share Posted May 31, 2023 I had a very similar issue on my Sigma engined 310R. I first noticed when I could only get about 120 mile range from the fuel tank... At that point the speedo seemed ok, but later it would drop from time to time at higher speeds before recovering. After comparing the odometer with a GPS watch I realised the recorded mileage was significantly less than GPS mileage.The light on the sensor seemed to be showing triggering was working ok at slow speed, but on-road testing was still showing issues. I had the sensor gap checked and adjusted, but not long after this the sensor completely failed. It's since been replaced and I have a working speedo and odometer again. Darren. Link to comment Share on other sites More sharing options...
Rhys Mann Posted June 1, 2023 Author Share Posted June 1, 2023 Thanks for all the advice guys, had s look at the sensor gap last night, adjusted it and all is back to normal now, thanks so much Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted June 1, 2023 Member Share Posted June 1, 2023 Well done.Was the speed display ever erratic?ThanksJonathan Link to comment Share on other sites More sharing options...
John Vine Posted June 1, 2023 Share Posted June 1, 2023 #10 Good news. Thanks for the feedback.Did you happen to measure the gap before and after? (That would provide useful info for those with a similar problem in the future.)JV Link to comment Share on other sites More sharing options...
Rhys Mann Posted June 1, 2023 Author Share Posted June 1, 2023 Not really, a little"jumpy" but that's better now too! Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted June 1, 2023 Member Share Posted June 1, 2023 ThanksJonathan Link to comment Share on other sites More sharing options...
Rhys Mann Posted June 1, 2023 Author Share Posted June 1, 2023 Hi John,I didnt measure but it must have been close, if not more than 2mm to start with Link to comment Share on other sites More sharing options...
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