You will have a terrible time checking the EGR on an 88 300e of any kind, as they don't have one.

Get a set of manuals on CD (they are available from several sources). Haynes manuals are pretty much useless beyond changing oil, belt, or brake pads, and may not even help much there.

What makes you think the (non-existent) EGR is stuck open?

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

Horrible misfire at idle. I have been posting on a few forums and someone mentioned that a closed EGR valve is fine, but one stuck open can produce a rough idle.

That's why I posted here to see if my 88 has an EGR Valve. Trying to slowly track down my misfire. Going to replace my O2 sensor tomorrow (has been replaced, but I'm sure its tarnished due to my bad valve stem seals.... so not expecting misfire to stop, but I need to replace it personally.

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2016 Monsoon Gray Audi Allroad - 21k
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