I changed out my valve stem seals yesterday.

When I went to start up the engine...it had some troubles.. so I shut it off.. it seemed one spark plug wire wasn't fully engaged. Took care of that.

Start up again... seems like a slight idle issue or miss. I look around and notice a vacuum line off. Put that back on.

Still not idling correctly, so I am thinking a cylinder miss. Maybe a bad spark plug wire.


I'll be out in a few minutes looking for any other vacuum issues..

any obvious way to tell a miss from a vacuum issue?



EDIT: took it for a test ride... has to be a miss.... when it cools, i am going to pull one wire at a time and see if it will crank. i figure cranking on 4 cylinders will be real rough..

when it cranks the same.... i'll have my culprit... if this doesn't work... i guess it will be vacuum


SECOND EDIT: I pulled the wires one at a time... the engine seems to respond the same, no matter which wire is pulled.

Stumped.... I am now wondering if a badly seated stem seal could cause the roughness?

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1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


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