Hello Tom and others similarly situated "Can't we all just get along?" - Rodney King
I accept that many believed fuel injector problems are really something else. I am always inclined to suspect ignition. My father, who was not a mechanically inclined person, told me "First go to fire, then go to fuel." Still true in my book. I understand there is such a thing as "worn out", and you can't cure "worn out" by cleaning. I know. I've tried it on other things. It doesn't work. Doesn't cost much, usually, just some time. Adds to experience. It is obvious there is also such a thing as "gummed up", and it is sometimes possible to cure "gummed up" by cleaning. I know. I've done that too. It works sometimes. Sometimes it works outstandingly well. Ed's case on the Porsche CIS fuel injectors sounds like one of those cases. Ed says it is. I was (still am) interested. Old type CIS fuel injectors are surely capable of becoming gummed up in the right set of circumstances. It has been pointed out they are very simple and have few parts that can wear out. I have to wonder about the fuel distributor, which seems much more complex than the injectors, and how/why it avoids the g word, if it does. The fuel pump and accumulator are not smart enough to avoid it, or so it seems. Someone who doesn't believe that an automotive gasoline fuel system, and sometimes the engine itself, doesn't get "gummed up" if it sits for an extended time without proper preparation for storage has a gap in his old car education. They do indeed get severely clabbered up sometimes. If necessary, please trust me on that one. BTW, I have been told by persons in a position to know that airplane piston engines do not have that problem because AVGAS is quite stable in storage. I don't have first hand knowledge, but have acquaintances who resurrect airplanes, and they say they don't have that problem. One was plannning to test run his engine (which had sat for no telling how long), and I asked what about the stale fuel problem. He assured me there is no stale fuel problem, and the engines and fuel are just as good and ready now as when they were last run. OK. I don't think they are pulling my leg, although they might be. True story: About fifty yr ago I pulled an old Ford out of a thicket where it had sat for years. After ignition system checks, I started it and ran it successfully on the fuel that was in the tank. Ran and drove it successfully until the old fuel was used up. I didn't have a clue then it might be gummed up. If the Ford were left in the thicket today, I think the fuel would turn to black goo or jello or something nasty like that in pretty short order. One of the aircraft resurrectionists asked what did I think would happen if one pours AVGAS into a styrofoam cup. I said I didn't think there would still be a styrofoam cup any more. He assured me the cup with AVGAS in it would simply sit there and not be destroyed by the fuel. True? Dunno. Told for the truth, yes. Please indulge me just a little if I ask about someone's experience that sounds interesting to me, OK? The only ways I have to learn are to read and ask questions. I promise to not interfere with others who, e.g., want to scrounge a used part that is relatively cheap and readily available from suppliers. I promise to not hoot at people who wonder what that new noise under the car (which is obviously something in the supension that is worn badly) is. Deal? Wed, 5 Sep 2007 00:25:49 -0500 From: "Tom Hargrave" <[EMAIL PROTECTED]>, wrote Subject: Re: [MBZ] [MBZ[ 560 back on the road, almost : Cleaning fuel injectors Robert, I've owned quite a few CIS cars and my experience is that cleaning the injectors is a waste of time. They don't get dirty, they eventually wear out. I mentioned the two injector failure modes in an earlier email & both are easy to identify. One is a worn out injector, causing a bad spray pattern & the other is a leaky injector causing the fuel system to leak down. Cleaners do nothing for either of these failure modes. Another list member also mentioned that the injectors have small filters - they do but I've never seen one plug up. Over 90% of the time a CIS issue is traced elsewhere. Thanks, Tom Hargrave www.kegkits.com 256-656-1924 _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
