HOW TO FIND PROBLEM CAUSING SUCH HIGH HC READINGS, CAULING FAILURE OF EMISSION TESTING

1991 Mercedes Benz 500sl

Tiny

captainkirk

September, 2, 2011 AT 10:09 PM

Idle is rough and at 2500 rpm engine has 900 ppm HC and you can hear and feel the miss. New pluges instaled.

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2 Answers

Tiny

Wrenchtech

September, 2, 2011 AT 10:34 PM

You've pretty much answered your own question. HC is basically unburned fuel, usually caused by incomplete combustion and a misfire is exactly that. You need to locate and resolve the misfire issue. Look first at plugs, wires, injectors, etc.

Tiny

rasmataz

September, 2, 2011 AT 10:44 PM

Could be an ignition misfire, lean misfire and low compression

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