inlet manifold/plenum chambers

[Les Newell]

I don't know about Vauxhall but I did the same thing to a Ford EEC IV setup
and increased the chamber volume. The result is a tendency for the engine to
hunt at idle and occasionally stall because it takes a lot longer for the
engine to respond to any adjustments made by the idle control valve. I think
I will have to reduce the volume somehow to stop this happening.

Les


> I am looking to put a Vauxhall set up on my kit car,but the manifold will
> not fit and I need to make one as no-one that I know about make such a
> manifold,
>
> how important is flow in a manifold and will it affect the mapping much?
> dose the volume in the manifold make much difference,? is it better to go
> bigger or smaller?
>
> Rob
>
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>
> ----- Original Message -----
> From: "John W. Stewart" <stewartjw at home.com>
> To: <diy_efi at diy-efi.org>
> Sent: Saturday, July 07, 2001 8:05 PM
> Subject: Re: Crank Sensor/Cam sensor
>
>
> > Bill,
> >
> > Though GM used both crank and cam sensors in 1996 to control timing, I
> doubt
> > that the lack of a crank sensor will cause this problem. If the cam
sensor
> > was bad, you would have erratic running on all cylinders, not just one
> bank.
> >
> > Since we have no way to know how Howell programmed ECU, it's tough to
> > detrmine if that is the  problem. If the car runs fine when cold, and
only
> > runs intermittently rich on one bank during closed loop, your most
likely
> > culprit is a bad O2 sensor ( not likely, since a code would have been
set)
> > or an intermittent connection in the wiring from the sensor to the ECU .
> > Intermittent problems ( whether high or low resistance causing a change
in
> > the voltage reading the ECU sees) may not set a code because the
duration
> is
> > to short. If this was the case, you would see the problem you describe,
> the
> > ECU would lean out that side and set the code for too lean a mixture.
> >
> > As mentioned , you could switch sensors from side to side to see if the
> > problem switches sides. My feeling is the wiring on connectors. Get the
> VOM
> > out and check the resistances for the O2 wires on the good side, and do
> the
> > same on the bad side. Providing the wiring lengths are not too
dissimilar,
> > they should be close. If one is way off,  you know the problem is in the
> > wiring or the connector(s). While you're at it, wiggle the connector
pins
> to
> > see if the values change, if they do, you've found the problem.
> >
> > John S.
> > ----- Original Message -----
> > From: <Onebil2mny at aol.com>
> > To: <diy_efi at diy-efi.org>
> > Sent: Saturday, July 07, 2001 8:41 AM
> > Subject: Crank Sensor/Cam sensor
> >
> >
> > > I have a question concerning the GM ECM# 18188021...  According to the
> GM
> > > manual I am using, both the crank sensor and the cam sensor are used
to
> > > determine #1 tdc and thus to calculate the computer will calculate the
> > > correct sequence with a 1 in 6 chance of getting it wrong. Could the
> lack
> > of
> > > a crank sensor coupled with a bad cam sensor cause this rich on one
bank
> > > problem I am experiencing? It is a seemingly random condition.
> > >
> > > Thanks!
> > > Bill K
> >
>
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