Re: [T3] Running Rich

["Steve Bradley" <scscomp@bellsouth.net>]

Yes, the pressure sensor hose is on tight and the connector is snug. I have 
a good spare pressure sensor and I've swapped it just to be sure the 
diaphram is good.

Is 7.2 ohms too low for the air temp sensor?


----- Original Message ----- 
From: "Keith Park" <topnotch@nycap.rr.com>
To: <type3@vwtype3.org>
Sent: Sunday, December 23, 2007 9:27 PM
Subject: RE: [T3] Running Rich



> My engine is running very rich. I've checked the fuel pressure and it is
> 30
> PSI. I have also temporarily disconnected the cold start valve. I suspect
> the temp sensors may be causing the problem. Would someone please do me a
> favor?  I need some kind soul with a multimeter to check the resistance of
> their cylinder head and air temp sensors for me (unless your car is
> running
> rich as well).
>
> Letting the engine idle for about 20 minutes at an outdoor ambient
> temperature of 38 degrees F., my readings are as follows:
>
> Cylinder head temp sensor  = 485 Ohms
> Air temp sensor = 7.2 Ohms
>
> According to the Porsche 917 website, the cylinder head temp sensor
> reading
> for a '71 Djet (that has the same part# for the cylinder head temp sensor
> as
> the T3 part) should be less than 100 ohms on a hot engine. I'm thinking
> this
> would apply equally to a T3 engine but, I would rather have a real world
> reading than make an assumption.

Yes. The head temp sens, hot, should be 100 ohms or less.  Try subbing in a
100 ohm resistor once the engine is warmed up and see what happens.

Is the pressure sensor hose on properly??

Keith


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