Actually, 5ATDC is the stock setting, although it is true the list recommends 5-7 BTDC. The 1.9L's 5ATDC is quite an annomaly as it seems like all other boxer engines were set at various degrees BTDC. Apparently this had something to do with being able to get the machine into North America' emmission standards. In my experience, 5-7 BTDC makes the machine much more powerful driving, at the expense of an unstable idle. It is also my experience that setting it to 5 BTDC makes it quite foul at idle, you can smell the unburnt hydrocarbons, probably wouldn't pass smog tests (none in this jurisdiction). Then again, I am no expert, just telling you what I know, or think I know. This all brings us to the question as to why would there be pinging when set at 5ATDC, as cw says it is mostly due to timming too far advanced, not retarded. There are other causes too, a lean mixture doesn't help, so do check those hoses for leaks. A good article on the subject of pinging (engine knock), generally is here http://zhome.com/ZCMnL/PICS/detonation/detonation.html
Fichten
----- Original Message ----- From: "John Rodgers" <jh_rodgers@BELLSOUTH.NET> To: <vanagon@GERRY.VANAGON.COM> Sent: Sunday, January 18, 2004 21:46 Subject: Re: 85 wbx miss at idle...update =)
> If that ATDC means After Top Dead Center, I think you are WAY off. I > don't currently have a 1.9L but if memory serves, the list recommends 5 > degrees Before Top Dead Center. > > I suggest you don't drive it anymore until this matter of timing is > settled or you could damage the engine. > > Hey, List Membership, please correct me if I am wrong. I'm just > interested in preventing a problems here. > > Thanks, > > Regards, > > John Rodgers > 88 GL Driver > > Erin Randolph wrote: > > >Hello list. > > > > I am happy to update that i have found most of the > >poor running at idle problems....The dipstick had > >pulled out about 1/2 inch...losing crankcase pressure. > > I stuck back in, and running improved greatly...Also, > >after some investigation, All of my Vaccum lines look > >like they need replacing. I re-timed at 0 and that > >made it run worse, So i set it to 5 ATDC, and it seems > >to be the best spot, I do however get some knock, but > >not real bad (I also havent checked the oil in a > >while, so i could just be low on oil) > >When i first checked the timing it was at 10 ATDC??? > > Any suggestions on getting rid of the knock? Also, > >how bout replacing vaccum lines (they are plastic with > >rubber ends) > > -Erin > > > >__________________________________ > >Do you Yahoo!? > >Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes > >http://hotjobs.sweepstakes.yahoo.com/signingbonus > > > > > > |
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