[Vwdiesel] smoke/stumbling on startup

[George Allison]

Most likely the rings just haven't seated yet. It's normal for an
engine to have higher friction, lower compression, more oil use, and
more vibration/roughness during the break-in period. Drive it another
few hundred miles, without any long trips at sustained constant speed
and with a few short WOT pulls in a high gear followed by coasting to
put some load on the rings and then lubricate them. Then report back
and tell us if the problems still exist.

It does sound like retarded timing or bad glow plugs, frankly. Check
that all of the new plugs are actually working, that the relay is
matched to the plugs and is working properly (for instance, fast relay
with slow plugs will make for rough, smoky starts), and ask the
injector shop if the breaking pressures were set to exact spec. If
they are too high, it will have the effect of retarding the actual
injection timing (regardless of how the pump is set). Does it not want
to start at all if you try to cold-start it with the CS handle in? If
so, it's probably bad timing somehow. Or are you setting timing with
the CS out? A common screw-up that we've all done at some point (I
definitely have), and that would explain your problems. Check all that
and drive it some more, and let us know.

On 5/26/06, david hardy <david at planetmind.net> wrote:
>
> >
> > Did you check the injectors for break pressure and spray after rebuild? My
> > '82 had these symptoms before I replaced the injectors, and new ones
> > cleared it right up.
>
> No, I'll have to find a shop that will do that. good point, though.
>
> > You didn't say how long since the re-ring, maybe not
> > seated yet? Others will know better than I in this area....
>
> it's only been about 80 miles. this is the 1st re-ring I have done on one of these, so maybe
> this is normal. I did get a pretty good cross-hatch on the cylinders when I honed.
>
> I noticed this morning that if I start it an run it at 2500 rpm or so, the missing/smoke clears
> in about 30 seconds. Not sure if this is due to warming up, or something is burning off. It
> better not be oil seeping past the valves, I just had the head rebuilt.
>
>
> -David
>
>
> >
> > On 25 May 2006 at 11:10, david hardy <david at planetmind.net> wrote:
> >
> >
> >>> Maybe someone can give some clues to what might be going on with my '81
> >>> Caddy...I just put it back together after re-ringing and a valve job, and it
> >>> smokes a ton of blue smoke until it gets hot, esp. when revving the engine.
> >>> Idles OK, and starts fine. But when you increase RPMs to about 1500, it
> >>> stumbles/misses, and smokes blue until warm. When it gets fully warm, it runs
> >>> fine, doesn't smoke, decent power.
> >>>
> >>> Engine has 153k, glow plugs are new. I just rebuilt injectors, inj. pump is from
> >>> another vehicle that was running fine on it. No air in fuel lines. Cam timing is
> >>> right on, inj. timing is at 1.0mm (retarding slightly doesn't help). No blowby
> >>> from valve cover cap. Compression is 375,435,435,390b cold.
> >>>
> >>> Anyone have any suggestions? Thanks.
> >>>
> >>> -David
>
>
> --
>
> ___________________________________________________________
>  ><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>
> ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
>   David Hardy
>   Planetmind Internetworks
>   Nedernet, Inc
>   ph 303.258.1103
>   http://www.planetmind.net
>   http://www.nedernet.net
> ___________________________________________________________
> <><<><<><<><<><<><<><<><<><<><<><<><<><<><<><<><<><<><<><
> ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
> _______________________________________________
> Vwdiesel mailing list
> Vwdiesel at vwfans.com
> http://www.audifans.com/mailman/listinfo/vwdiesel
>