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Discussion Starter · #1 ·
Yesterday I sailed through the Swiss emissions test. The results are better than before. All readings well within requirements but there is one reading that I find strange - that of HC (on previous tests around 20 ppm); I have over the last 6 months sorted out the stepper where I reduced from circa 50 steps down to 21 steps (MG Rover recommended).

The readings:

870 RPM, CO 0.00%, CO2 14.26%, HC -4 ppm
2,480 RPM, CO 0.00%, CO2 14.66%, HC -2 ppm

QU: How can on hydrocarbons the readings be minus parts per million? Max allowed under Swiss regs is 100 ppm.
 

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MG ZT, Rover 25
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5,713 Posts
Dunno. Calibration error? You passed, so take that! 馃榿
 

In the Garage
MG TF
Joined
33,129 Posts
I am surprised they let that pass with a negative reading, I think this is what happens when air is being sucked into the exhaust from the other outlet. MoT testers are known to get F/TF鈥檚 through the test with one of the exhaust pipes blocked up with a rag.
 
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