Hey all,

I have a friend at work who has a 1992 300E which has trouble starting when cold and also runs very poorly until up to operating temperature. He also failed emissions with high NOx (7 g/mi over limit of 5), and he had very low CO and HC levels so it's most likely running lean.

Could it be the CIS-E computer is not enabling cold start and cold enrichments and also running the engine lean at op temp? I'm trying to give him some advice where to start. Are trouble codes available from the fuel computer? If so, how do you access them? Does the engine fail lean or rich when the EHA valve is unplugged?

Thanks for the advice

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Dave

2002 Audi S6 Avant
1983 300D
1984 300D (sold)
1990 560SEL (sold)