[urq] 83 urq stumble now 4k cutout

[Brady Moffatt]

Thanks, Martin.

I guess that leaves fuel pressure, because I checked the air temp sensor
along with the idle and WOT switches last week. I'll check them again to be
sure.

Any idea where to buy fuel pressure testing kits that have the right
fittings for CIS and allow for high enough pressures? I bought one at
Canadian Tire, but it needs a Schrader valve test port... Time to return it.

It's odd. I thought that by doing the FP relay mod that I'd gain fuel
pressure. Not the case apparently.

Could a boost leak cause a 4k cutout?

Cheers,
Brady

----- Original Message -----
From: "Martin Pajak" <martin at quattro.ca>


> You need to check your fuel pressures.
> Cold and warm.
>
> 4k rpm, either the air temp sensor or the idle switch.
>
> The black connector at the back of the head.
> On the '83 this can be either the cold start thermo switch (large one) or
> temp gauge sender (small one).
>
> Hope this helps.
> Martin Pajak

> > -----Original Message-----
> > From: urq-admin at audifans.com [mailto:urq-admin at audifans.com]On Behalf Of
> > Brady Moffatt
> >
> > Hi All,
> >
> > Well, Louis-Alain and I spent hours on my urq today.
> >
> > We checked and tightened many small vacuum and large hoses,
> > checked many electrical connectors,
> > did fuel pump relay mod (it was at 11.9V before, though the
> > connector was in
> > beautiful shape),
> > removed blowoff valve,
> > checked O2 sensor operation,
> > checked vacuum at warm idle (12-14" Hg),
> > adjusted FVDC to 40% at warm idle,
> > other stuff I can't remember.
> >
> > Now, the stumble is still there (though I think it's more subdued),
> > and there is now a 4K RPM cutout to keep the stumble company!
> >
> > We also noticed that the black 2 pin connector on the back of the head
is
> > missing. It's probably not related, though.
> >
> > Anyways, what to do next to eliminate these problems?
> >
> > Cheers,
> > Brady Moffatt


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