stumbling 4kcsq

[James D. Hanson]

OK... so its a vacuum leak, bad or leaky injectors, or bad mixture.  In
which order to I check these?

For the injectors, I was going to pull each and examine it (I should
replace the seals, right?).  If they look bad, replace them (ouch).  Idle
mixture, just fiddle until it runs right.  Vacuum leak... ??? How do I
track down a vacuum leak?

Thanks,
Jim


BTB: Oh, someone asked about NOx levels... they're not checked in
Washington,
so I don't know what they are.



On Mon, 4 Mar 2002, James D. Hanson wrote:

> Oh, it just occurred to me that this may be related.. (duh)
> it failed emissions at idle, with high CO levels.
> Running too rich?
>
> Thanks,
> Jim
>
> On Mon, 4 Mar 2002, Brady Moffatt wrote:
>
> > Jim,
> >
> > Mine did the same thing, and what "cured" it was richening up the idle
> > mixture a bit. What  _caused_ the problem, though, was some vacuum leaks
> > (manifold gaskets, injector seals). Once those were fixed, the mixture had
> > to be leaned back out a bit. HTH.
> >
> > Cheers,
> > Brady Moffatt
> > Montreal, Quebec, Canada
> > 86 4ksq, 282,000km
> > 72 Datsun 240Z, 180,000 miles
> >
> > ----- Original Message -----
> > From: "James D. Hanson" <jhanson at westmont.edu>
> >
> >
> > > My 87 4kcsq seems to have a problem... when accelerating away from a stop,
> > > the engine stumbles between about 1000 and 2000 rpm.  Accelerator position
> > > seems to have no effect.  If I rev the engine first a few times, then
> > > accelerate, there's no problem.  Similarly, if I don't give it a chance to
> > > settle into idle, its fine.  This happens warm and cold, though its most
> > > noticeable when the engine is warm.
> > > Any ideas what is causing this?
> > >
> > > Thanks,
> > > Jim
> > >
> >
>