'88 5KSQ (NA) Idle and Full Throttle Switch (CIS-EIII)

[Huw Powell]

> Can anybody give me any info on the idle and full throttle switch(es) on
> this car?  Still trying to fix my throttle problem - severe surging at
> cruise speeds.  May be a throttle cable problem.  Did the fault code
> checking and got a "2121" - idle switch.  Bentley, at 25.106, says to check
> for 0 ohms between terminals 1 and 2 with throttle closed.  Got 1.3 ohms.
> Then check for infinite ohms as throttle gap is opened 1/2 mm.  No change.
> There was 12vdc at terminal 2 at the mating connector with the ignition
> switch on.
> 
> 1. Does this indicate a bad idle switch?  Or, could it be a throttle cable
> misadjusted?

maybe - does it go infinite at further throttle opening?  it may just be
misadjusted if so.

> 2. Where is the idle switch?  Is it that jobby next to it with 2 phillips
> head scews on the top?

no, that's the WOT switch (should close at about 60% - Bentley says - of
throttle opening).  The idle switch is hidden underneath the throttle
body.

> 3. Are the idle switch and the full throttle switch the same?

no.  they share a connector.  Pin 2 is power, 1 is idle sw connection, 3
is WOT sw. conn.

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/