2 pin idle switch (JT 4kq - Starting Issues Solved)

[Michael Veglia]

Thanks for the update Johnny, great progress!

Mike Veglia



________________________________
From: Johnny B <pre95 at live.com>
To: msvphoto at pacbell.net; quattro at audifans.com
Sent: Fri, August 27, 2010 7:59:03 AM
Subject: RE: 2 pin idle switch (JT 4kq - Starting Issues Solved)

 I have verified the idle switch has failed in the open position so the car 
never believes its at idle (checked with a voltmeter, and finally left it 
unplugged and drove around, no change). I'm certain because of this on initial 
start up the car is throwing itself in to closed loop mode (lean & efficient 
mode) and ignoring the coolant temperature sensor telling it to go full rich 
until that first minute or so while the o2 warms up to start telling the ECU how 
much fuel to deliver. Once the o2 comes up to temp all the issues go away as the 
ECU can now regulate proper fuel delivery to mask the idle switch failure. 


When I had first checked the switch I only looked to see if it was open with the 
throttle open on the voltmeter, but must have been moving too quickly and never 
checked the closed position. Luckily while sprucing up under the hood I realized 
I didnt hear the audible *click* when the throttle is opened a tad.. this lead 
me down to retesting the switch and ultimately finding it has failed. I have 
lucked out and have several switches now I can install, only problem is a 
rounded out throttle body bolt for me to take care of this weekend (going to 
have to drill or chisel the head off or something, looks mighty FUBAR'd). 


As for physical damage, I was able to get a good look at the switch and it seems 
the arm for the trigger is completely gone. My plan is to retain the switch body 
and build a new arm for it just to have something on the shelf for the future. 


Johnny