Two years ago the Gunson was 0.9% out from the Lotus MOT results. So both out by 0.9% from MOT. ![]() I then tested my BMW E36 which had 0.02% CO at MOT idle test but Gunson gave 0.9%. I calibrated the Gunson in the air at 2.0% and followed all the instructions. I decided to use a digital Gunson Gastester (some years old) to see if I could increase CO to within the factory range. The MOT numbers for CO at 2000rpm is too low at 0.124% to 0.265% which could be causing the high HC.įirstly I used the Carbtune Pro manometer to test balance of the carbs but none was needed (very simple to use). It sometimes fails the idle test on high HC but passes the test at 2000rpm. I always have problems with the MOT emissions idle test for my 1986 Lotus Esprit S3.
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