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Benzmac
Further to my recent posting here is some background information. I have owned my 35k mile 1985 euro 16v for 13 years and it has been well maintained with OEM parts. It does not have a cat, o2 sensor, frequency valve, etc. In the past it has always passed the old 4 gas emission test in Illinois. The only change I would make was to turn the EZL plug (located next to the battery-2 wires in-1 brown, ground-ok, 1 black/yellow-approx.-6 volts out) counter-clockwise 2 positions. Power would decrease dramatically-similar to retarded timing. Recently I made this same adjustment and it had no effect on performance-and the car failed the new IM240 dyno emission test. It passes co and hc at higher rpm but fails both at idle-test results are a composite of the two. I replaced the EZL plug (the resistors tested the same however) but adjusting the position as previously has no effect on performance or emissions. The wires from the EZL (referred to as a Reference Resister) lead into the ECU. Am I missing something or is this an excercise in futility? Sorry for the lengthy diatribe, but your advice would be greatly appreciated! Regards, Mike C |
#2
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What you were doing was changing the timing advance curve, so the timing was the only item affected. On "euro" cars there is provision for poor quality fuel. Sounds like you will need to have fuel system adjusted & or modified to pass, possibly even a catalyst.
------------------ MERCEDES BENZ MASTER GUILD TECHNICIAN ASE MASTER TECHNICIAN 27 YEARS DEALER M.B. Shopforeman 190E 2.3 ITS RACECAR 1986 190E 16V |
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