My Escort (R reg 1.8 16v Ghia X hatch) has failed its MoT test on emissions. The readings varied a lot, and the tester tried every possible way to get them down to a pass figure but with no joy. The end results were:
Fast Idle Test:
CO (<0.3%) 0.003%
HC (<200ppm) 10ppm
lambda (0.97-1.03) 1.202
Second Fast Idle Test:
CO 0.006%
HC 3ppm
lambda 1.273
Natural Idle Test:
CO (<0.5%) 0.219%
The Lambda figures are too high, ie there is too much oxygen left in the exhaust after combustion has taken place - in other words the engine is running lean. This is borne out by a slightly woofly idle and a hesitation on light throttle openings.
The MoT tester pointed out a vacuum hose underneath the back of the engine that could be split, but today I found that the same hose was actually not connected to its termination on the back of the inlet manifold. After taking the hose off the car and cleaning it anyway, it seemed to be sound so I refitted it. The car ran much better all the way back to the test centre, whereupon it promtly failed again with much the same figures.
Any ideas?
Last edited by: VxFan on Tue 18 May 10 at 10:32
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