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Old 04-06-2001, 05:23 PM
Ron Johnstone Ron Johnstone is offline
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Join Date: Jan 2001
Location: Santa Clara, CA
Posts: 411
Have you changed your plugs recently? Do they look good, i.e. not fouled, black, etc. You MUST have the plugs firing properly to obtain a good smog reading. Does your smog report say that your timing is within spec.? If not, get that fixed. Is your air filter clean? Are all, and I mean all of your vacuum hoses o.k. Wiggle them at each end to be sure. You frequently get cracked ends that cause vacuum leaks. Is your computer readout telling you of any problems such as the O2 sensor? It doesn't sound like you have much of a problem as a bad one would have sky high readings. I would do the CAT at last resort as it is so expensive, but changing it would certainly get you through the test. Good luck!
'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
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'86 560SL 124K Miles
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