[T3] Question about D jet idle issues 73 T3

[William J]

Thank you Jim:

 I decided to plug the IAD sensor back in and let it warm up and set the 
Idle so it was 1,000 RPM in drive. I also checked the HTC wire and it's 
nowhere near # 3 wire. Had the timing light connected it was righ at 5 BTDC 
and brought the RPM up and it advanced smoothly and then dropped right back 
to 5 BTDC.

 I also checked with the timing light on each wire and each one was a steady 
flashing.

  I still hear this erratic miss in park but not as bad as it was with the 
other MAP I had in it. I set the parking brake put it in drive so I had a 
load of sorts Idle was @ 850 RPM and then listened and felt the exhaust and 
it was steady and heard no miss.

 I did hear popping out the exhaust in park no load if I brought the RPM up 
and released it yet not as bad as with the other MAP.

 Tomarrow I drive it and see how it acts.

 Jim if you let me know what the new runner boots cost for 4 I would like to 
get them . I hope the intake gaskets are ok as far as the plastic spacer I 
can get new gasket material to place on both sides. The reason I want to 
check the oil cooler seals and also the fins in case they are partly plugged 
and also set the Flap rod as you suggested. the stat does work .

 William
----- Original Message ----- 
From: "Jim Adney" <jadney at VWType3.org>
To: <type3 at vwtype3.org>
Sent: Thursday, January 28, 2016 2:35 PM
Subject: Re: [T3] Question about D jet idle issues 73 T3


> On 28 Jan 2016 at 9:48, William J wrote:
>
>> I forgot to add . The ground lead /center terminal with the trigger unit 
>> out
>> does not have the small braided lead soldered/ welded to the base yet 
>> when I
>> tested with an ohm meter it does have ground contact to the base and dist
>> body beside that if it didn't it would not funtion..Was this something 
>> Bosch
>> may have changed at some point?
>
> The center pin of the FI trigger points should NOT be connected to
> the trigger point base nor to the distributor body. It connects to a
> common point between the 2 contacts. If you measure with an Ohmmeter
> with the distributor installed, however, you will find continuity
> because the center pin connects back to ground via the brain and the
> wiring harness.
>
> For a better understanding of this, see this drawing:
>
> http://members.rennlist.com/pbanders/ecu1.jpg
>
> You want a single point ground for the FI system. Multiple grounds
> will lead to what are called ground loops, which can cause problems.
>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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