Just changed my plugs and a plug line - what gives here?!

[Danbot]

Well, I just changed my plugs, the ones I took out looked ok, except for one - the number 1 cylender - it looked so disgusting and manky, looked as if it was full of black mud. I also changed my number 4 cylender plug lead, cause it had a hole in it. What could have made my number 1 cylender plug look so bad, and why would my number 4 have a hole in it?? Apparently they are still stock parts, but somehow I cant believe that, on a 20 year old car!! 325i, 1989.

[triggrhaapi]

dude, old cars just have random bad things happen from time to time.

[325isBaby]

agreed...it's an aging process like anything else (as we get older we fall apart too ya know!)

[ldsbeaker]

I concur. Probably for the same reason that I had a leaky plug wire from a BRAND NEW set of wires from Bavarian Autosport...:

[Starmavin]

Most likely its from a leaking fuel injector.

[Danbot]

how do I go about checking if an injector is working? Its usually only at lower revs, just above idle, then when I put foot, and revs climb, then its back to normal...

[Starmavin]

Sorry to say, to check for injector leak down with out the actual injector tester, is to remove the injector rail. Once out reconnect the fuel lines (make sure that all the injector retainers are inplace) then repressurize the rail by cranking a few times (don't worrie it won't start) stand by and watch for dripping injectors.