Re: [DML] Dwell meter readings + possible vacuum leak

["Joseph Kuchan" <josephkuchan@xxxxxxxxxxx>]

On my son's car the two hoses were in great shape but the rubber vacuum cap 
on the canister was very rotten and probably leaking when he first bought 
the car. It soiunds like that is a common issue. You can find those things 
for under a buck at any auto parts store.

If you do have a big vac leak, the lambda system can be driven crazy trying 
to compensate. This is most likely the trouble you are seeing.

To check if the leak is inside the pontoon, just clamp off both hoses that 
go to the charcoal canister. If the hissing disappears, you have a leak 
inside the pontoon.

-Joe Kuchan


>From: "Mike Bosworth" <mike.bosworth@xxxxxxxxxxxxxx>
>Reply-To: dmcnews@xxxxxxxxxxxxxxx
>To: dmcnews@xxxxxxxxxxxxxxx
>Subject: Re: [DML] Dwell meter readings + possible vacuum leak
>Date: Tue, 07 Mar 2006 14:14:52 -0000
>
>Hi Jeremiah
>
>I trust you are well.... just to clarify...
>
>On the coal canister there are actually 3 hoses coming off.
>1no goes to the cold start valve brass tube (canister purge line)
>1no goes to the tank vent pipe
>1no goes to the throttle body tapping.
>
>Agree on the other blanked off tapping . My tapping is actually
>moulded in as part of the canister itself ..
>
>Kind Regards
>
>Mike
>#2001
>
>--- In dmcnews@xxxxxxxxxxxxxxx, Jeremiah Montee <angelito03299@...>
>wrote:
> >
> > It could be a loose/rotted hose on the "coal canister"
> > that is located in the left side of the engine
> > compartment.  There is a little square held in by 11mm
> > bolts.  Take that square part off and look on the coal
> > canister; there are 3 ends - 2 of them utilize hoses.
> > The third is appropriately labeled "carb", and since
> > our stock DeLoreans don't utilize a carburetor, there
> > should be a rubber end on that connection.  If the
> > rubber is cracked, brittle, or just plain NOT THERE,
> > that could be a huge vacuum leak.  It can happen,
> > believe me, I found out one afternoon just taking the
> > time to look - found that it was completely rotted
> > out.
> >
> > Jeremiah
> >
> >
> > > Now; I can hear this hissing sound on the driver's
> > > side of the
> > > engine. Listening through a piece of PVC pipe the
> > > sound seems to
> > > come from the hose that runs between the cold start
> > > valve and the
> > > idle regulator.  I removed the hose and it is fine
> > > but the sound
> > > persists! I originally though that the leak was
> > > coming from the tube
> > > that runs into the mixture control unit. Any ideas?







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