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Engine Specific Info and Questions => IDI Engine => Topic started by: dokarex on January 29, 2010, 12:16:32 pm

Title: What is this?
Post by: dokarex on January 29, 2010, 12:16:32 pm

http://www.vwcaddyforum.com/showthread.php?t=33647 (http://www.vwcaddyforum.com/showthread.php?t=33647)
In the picture of the AAZ pump(scroll down) what is the round black thing coming out of the LDA. With vacume applied to it does it keep the LDA diaphram from moving,to improve emissions? I believe it was once hooked up to a micro switch tha once certain rpms we obtained it closed the switch cutting ff the vacume and let the LDA work? Should I remove the vacume line so it will work?
If I'm wrong let me know.
Sorry about the link but it was all I could find for a pic of this part.

Title: Re: What is this?
Post by: blackdogvan on January 29, 2010, 12:38:52 pm

High idle vac actuator. Its run from a vac valve that uses the same temp switch as the GP cutoff. Mine works great, GP's stay on for a few seconds & then when there is enough vac the idle kicks up 200rpm. Once the engine comes up to temp it settles down. The 2.4 IDI's i've seen in the eurovans had a version that used coolent only to actuate the high idle instead of my AAZ version thats more complicated IMO.

Title: Re: What is this?
Post by: dokarex on January 29, 2010, 01:00:34 pm

Since I transplanted the aaz into a Doka, I've stripped all the electonics of this means the high idle actuator always has vacume going to it. Should, once the engine is warmed up, this shut off so it will idle properly?

Title: Re: What is this?
Post by: Vincent Waldon on January 29, 2010, 02:09:53 pm

Quote from: dokarex on January 29, 2010, 01:00:34 pm

Since I transplanted the aaz into a Doka, I've stripped all the electonics of this means the high idle actuator always has vacume going to it. Should, once the engine is warmed up, this shut off so it will idle properly?

Sure.

Or simply disconnect it, delete it, and adjust the idle speed as required with the set screw... this is the approach most people use.  The less vacuum hoses and actuators the better??!!

This has been my approach... the only loss is that in its stock config the fast idle is also actuated when the A/C is on... so my car vibrates a bit more at idle when I have the A/C running.  Ah well...   ;)

Title: Re: What is this?
Post by: blackdogvan on January 29, 2010, 02:24:10 pm

If you're deleting the high idle go for the GP relay that keeps them on the longest after start, not sure what the part number is for that tho, sorry. TDI part IIRC...

Title: Re: What is this?
Post by: dokarex on January 29, 2010, 05:36:16 pm

thanks this will clean up the engine quite a bit as there will be no more vacuum lines and one less thing hanging off the ip
If the high idele actuater is siezed from always being under vacuum (except when not running), what cold you use to free it up?