[Vwdiesel] Makes blue smoke when first starting engine in morning. Why?

[George Allison]

With the misfiring and the blue smoke happening concurrently, I'd say
that you have problems with either compression or timing. Retarded
timing will make it clack loudly, buck, and misfire on a cold start,
even with the cold start handle out, and will also cause the fuel to
combust incompletely, making blue smoke. Valve guides could also cause
the blue smoke, but would not account for the misfiring. If the
injectors were tested by a diesel shop and their spray patterns and
breaking pressures are within spec, they're probably fine. I'd try
advancing the timing a few degrees (tilting top of pump back towards
engine a tiny bit). Easiest if you have a dial indicator to check it
actually. On older pumps, because of piston seal wear, I set it a
little ahead of the factory spec, usually around .95-1.00. Makes them
run really nice.

If your rings were worn and you had low compression, it would also
cause hard, smoky starting and misfires when cold, so you could do a
compression test too if the timing advance doesn't do the trick. But
I'd start with bumping the pump up a little bit, and seeing if your
problems go away.

On 5/8/06, LBaird119 at aol.com <LBaird119 at aol.com> wrote:
>  Regardless that you've had them tested, I still say the most likely
> cause is the injectors.  ;-)  Was it a shop that specializes in diesel
> and injection or just someone that could test them?  If you don't know
> what a new/good one looks and sounds like, one that needs replaced
> can look fine unless you compare.  It could also be timing set too
> retarded, such as a yellow dot pump set to early pump specs or
> timing set with the advance pulled out.
>  Give it the sniff test.  If it smells like diesel then it's fuel related.
> If
> it smells like oil then it'd be valve stem seals most likely.
>    Loren
>
> In a message dated 5/8/2006 7:01:52 PM Pacific Standard Time,
> sherwingoff at yahoo.com writes:
>
> >  I had the injectors removed and each one checked for pressure and also
> > tested for a good misty spray.
> >
> >  What are the possible causes of blue smoke when first starting the engine
> > in the mornings?
> >
>
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