[T3] gas mileage, voltage, etc.

[William J]

 If I recall you replaced the engine FI harness . When we talk about 
intermittent shorts or even open circuits that are intermittent . where does 
the new engine harness connect to the body harness ? I  imagine since the 
power relay is the main source from the brain to the chassis plus the ground 
from the fuel pump relay to the brain is about it. I don't recall if you 
looked at those connections , think you have. I would check where they 
connect maybe 3 wires .

 Also does you car have the cold start relay ? I only ask because the 
Bentley only shows a basic harness not wire by wire as the later models . I 
don't know where the cold start rely is located on your car yet looking at 
the page17  system #32 &33 go to the cold start valve yet on the throttle 
pressure switch there are 14 & 9 yet # 34 is on 14 and # 34 is also on the 
cold start rely. That is the only place I see # 34 . Since they don't show 
the actual wires and you've had issues in that area before per the pressure 
switch and if you still have the old harness perhaps see what #34 does. # 34 
does not go to the brain yet 14 and 9 do , if #34 is somehow tied to #14 the 
relay itself might be an issue internally. It's just a thought .
----- Original Message ----- 
From: "Daniel Nohejl" <d.nohejl at gmail.com>
To: <type3 at vwtype3.org>
Sent: Sunday, June 25, 2017 8:18 AM
Subject: Re: [T3] gas mileage, voltage, etc.


>
>>> So should I just check the spark plugs for "fouling" before moving on
>>> to investigating "hard" FI components for issues?
>>
>> Yes.
>>
>> Another thing to check would be to look for stray wire strands that 
>> didn't get
>> caught in the crimp, either in the brain connectors or out at the engine 
>> end.
>
>
> I pulled all the spark plugs and found an interesting pattern. 1 and 4 
> were “fouled” and 2 and 3 were pretty white, despite the fact that on 
> Friday #3 looked like 1 and 4 in these pics.
>
> 1 and 4
>
> https://www.thesamba.com/vw/gallery/pix/1659498.jpg
>
> 2 and 3
>
> https://www.thesamba.com/vw/gallery/pix/1659499.jpg
>
> I replaced all of them since I didn’t have enough of the same heat range 
> to just replace 1 and 4. The ones in the pics are B5HS and I replaced them 
> with B6HS. I also recalled (correctly I hope) that the trigger points fire 
> 1/4 and 2/3 as pairs and that the condition of my plugs followed that. The 
> connector from the harness to the trigger points has seemed fairly loose. 
> I discovered last week during diagnostics that it could be wiggled off the 
> trigger points with little effort. I removed the connectors from the plug 
> and tightened them up ever so slightly and got a good snug fit when 
> plugging it back in.
>
> I went for a drive around the neighborhood and nothing was awry…..no 
> missing and no weird idling. However, it took a bit of driving for things 
> to go wrong yesterday so there’s still every chance that the problem will 
> return. Should I have issues again, does it seem that today’s discovery 
> means I should replace the trigger points? Or is what I found more of a 
> coincidence?
>
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