Bess's Buddies wrote:

> We disconnected the O2 sensor, and it drove just the same. No power over
> 3200 rpm. Fine torque in first, fine running in low rpm range. Starts and
> idles nicely, rev's up fine when idling.

Where is the ignition timing set at on your engine?

> 1. What is an AFM? I see in the bentley the whole system is called an
> "AFC". Is it the "intake air sensor"  (Air Fuel Mixture?) attached to the
> air cleaner?

AFM is the air flow meter...it's a potentiometer for the air flow to the intake
and also houses the temp 1 or air temp sensor.  AFC is, I believe, air flow
control(?). It is the type of fuel injection system used in the Vanagon engines.

> 2. This "TempII" sensor, is it the one the bentley just calls "Temperature
> Sensor" that on the left hand side of the engine behind the spark plug?

Measures coolant temps.  I don't have nor have ever had a 1.9 or 2.1
water-cooled engine, but this sensor is likely close-by where the picture in the
Bentley shows it to be.

>
> How does one test that temp sensor... with the engine running to see the
> range in readings with the coolant temp? Or just a couple static readings
> cold, warm, etc.?

I'd have to read the book, but it likely involves resistence readings at
observed temps.

>
> I'm a little nervous soldering that digitool to our computer (Is that the
> "ECU"? The bentley calls it a "Control Unit") ... is it scary? I'm a bit of
> a computer geek so I do know how to run a soldering gun, but soooo many
> connections!

I just bought a 30 watt iron and am thinking of trying to do this in the future.

>
> So we can floor it, and it doesn't rev up... but there is no gas going to
> the cylinders as we had pulled a plug and it's running nice and beige. My
> gut instinct tells me it's "intake air sensor" by the aircleaner...? is
> that the AFM?

I'd just start going by the book and testing things and checkings connections
and grounds.

> fine then. The idle stabilizer was acting strange and it wouldn't rev down.
> (Oh, the days when it would rev up!) the wiring that goes to the "Idle
> stabilizer control unit" was fried way back into the harness that went to
> the power steering pump switch. It has now been disconnected, and has been
> for awhile. It just is rough until it warms up, but the whole rev problem
> went away.

I'm not familiar with the ways of the idle stabilizer.  I've got a used one I'll
sell with the socket and about 3' of wire ends connected to it.

-Dana-

> Bess's Buddies
> Glen & Rianda