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Engine Specific Info and Questions => IDI Engine => Topic started by: Colony on April 04, 2021, 02:34:12 am

Title: IDI pump
Post by: Colony on April 04, 2021, 02:34:12 am

Hello
Can some1 tell me what function have this electronic part on pump?
Where electric impulse go? I dont have ECU on car but have something called 357906121 Exhaust gas recirculation control unit for Volkswagen Passat B3.

Engine code: AAZ
I have some vibration on idle and it goes away if I get revs higher . Engine AAZ 1.9TD 1992 Passat B3
(https://i.ibb.co/5cVM0nN/s-l1600-1.jpg)

Title: Re: IDI pump
Post by: ORCoaster on April 04, 2021, 02:21:21 pm

Having never seen such a pump I have absolutely NO IDEA.  Sorry, I defer to others.

Title: Re: IDI pump
Post by: sgnimj96 on April 04, 2021, 06:11:53 pm

looks like it bumps up the idle,  I bet if you could see under that top cover the wire goes into you'd figure out what it does.

Title: Re: IDI pump
Post by: fatmobile on April 05, 2021, 12:09:24 am

 What you circled is probably just a plug holder.
 The wire probably goes up to a throttle position sensor.
 Complete guess, I have no experience with this pump.
 Might be handy for an electronic VNT-15 turbo controller.

Title: Re: IDI pump
Post by: Colony on April 05, 2021, 12:19:40 am

UPDATE
I found out more. When you disconnect this plug on pump egr solenoid stops working and egr shut closed on idle. So this is some part of egr sistem.

Title: Re: IDI pump
Post by: rabbid79 on April 05, 2021, 11:30:01 pm

My vote is throttle position sensor too. My guess is that the EGR behavior you noticed was in response to the system losing contact with the TPS when you unplugged it.

Title: Re: IDI pump
Post by: thomas m on April 16, 2021, 10:25:25 pm

I thought that my 1991 MK2 pump was unnecessarily complex.
That one makes mine look like a Tinker toy!!