Au-2 Cuts Out In Park And Neutral

grantm · 21-06-2007, 09:49 PM

Hi, I have an AU-2 Falcon wagon on dedicated gas and today just after I filled up it started stalling when the transmission was shifted from drive to either park or neutral. The funny thing is it starts and runs ok in park and neutral. I tested the inhibitor switch on the side of the trans ie,5 volts between terminals and all the resistances fall within their tolerances for all the trans positions , park to 1st. I have cleaned all the terminals etc so hoping this may help or might get another inhibitor switch just in case this one is intermittantly faulty.
(I don'tthink filling up with gas had anything to do with it but I also over filled the windscreen washer bottle which may have wet something down the passenger inside bonnet side)

Not sure what else to check. The only sure thing I know is that it dies when shifted from drive to neutral or park.
If anyone has ideas on what could be causing this problem it would be much appreciated.

grantm · 25-06-2007, 07:33 AM

For a quick fix I have adjusted the idle screw up so that it runs or idles at 700rpm. I read the manual and it looks like its the IAC valve which could be faulty or blocked, as it runs on LPG, I suspect the wax problem again.

GK · 25-06-2007, 09:52 AM

Quote:

Originally Posted by grantm

For a quick fix I have adjusted the idle screw up so that it runs or idles at 700rpm. I read the manual and it looks like its the IAC valve which could be faulty or blocked, as it runs on LPG, I suspect the wax problem again.

Make sure you mark the idle screw in some way so you know where to put it back to, once you've done the cleaning of the IAC valve.

GK

StealthAu · 25-06-2007, 09:55 AM

Have you made a "how to" on cleaning th IAC valve GK?

grantm · 26-06-2007, 10:01 AM

I took the IAC valve off last night. First I tested the resistance of the solenoid and it was within the limits. I then and cleaned the carbon out of it (no wax), the problem was carbon on the plunger shaft therefore not letting the valve open and close, its a bit like a thermostat valve in your cooling system only operated by an electrical solenoid. Mine was stuck about 1/4 open. Washed it out with carby cleaner using a very small paint brush (tooth brush was too big), then applied wd40 and made sure it moved in and out. I put it back on and followed the manuals instructions on how to set the idle speed. From memory this was
1. Run engine to normal operating temp.
2. Stop engine, pull off IAC lead, insert 0.75mm feeler gauge between throttle stop and lever.
3. Start engine and let run for two minutes then adjust idle speed to 700rpm.
4. Stop engine.
5. Remove feeler gauge and replace IAC lead.
I did all of this and the car runs perfectly (sits right on 700rpm in park and neutral now), I also sprayed a bit of carby cleaner around the butterfly shaft to degum everything.