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On 8 Oct 2001, at 23:56, Flat4Pat@aol.com wrote: > That sounds like good advice Jim.... and It is well taken. But, why does the > run on problem go away when the engine is adjusted this way? It does work, > if all other things are adjusted to factory spec... I have done it several > times. This is to fix the FI run on problem, not to have every engine > adjusted this way. Now, valves do expand and contract depending on temp ( > just like any metal does) but .002 more REALLY does not harm the drive > train... I have one in the driveway that has 47,000 miles on the engine with > it adjusted that way. The quality of many VW air-cooled valves are not the > best... the garbage that some sell on rebuilt heads is beyond fathom.... and > the cooler running valves seem much happier. Any of you ever notice how your > exhaust valves are always getting tight after a few thousand miles when set > at .006? Remember I said that setting them to .008 HELPS TO SEE if that > stooped the run on... meaning set them back to .006 if it does not help. I > also mentioned that this is for troublesome cars..... not all cars. First of all let me say that I'm probably even less interested in starting a "war" over this than Pat is. I value Pat's input and always consider what he has to say carefully. All I can say in my defense is that I've never had what I would consider a run-on problem with any of my FI engines so I have never considered what I could do about it. Given the way that the FI works, I also don't understand how loosening the valves could help, since turning off the key removes both the FI and the ignition power. I think that there is a chance that if you find that your engine needs the extra valve lash, then this might well be a sign that it really is running too hot. In that case I would think that the appropriate thing to do is to correct the problem, rather than live with it and adjust the valves to accomodate the higher temp. For starters, I'd look for a mixture that was too lean. OTOH, we DO have Mike's complaint that his engine "runs on" occasionally. I'd like to hear a more complete description of what Mike actually hears. > As a second note...... there has been some conversation about putting the gas > petal to the floor to start a FI engine. I originally saw this on the back of > a FACTORY sunshade in 1969 in Germany. It is also printed in the owners > manuals for FI cars under starting hints. You're probably right about the manual; I'll take a look at one of mine. It's also possible that they changed their recommendation over the 6 years of FI production. I just never owned one for which full throttle worked well for starting, at least when it was running right. Of course I have had cars that went thru periods of hard starting where I tried everything I could think of, until I found the underlying problem and fixed it. I always give my cars little or no throttle to start them, but I probably give a bit more when it's cold. Remember: where I come from, cold means COLD. Most of you will never have a chance to test this. ;-) - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/