[T3] Bad day at the (FI) office

[William J]

 This is just a thought I had thinking about how your car acts.

 I may be far off here and it's not often this happens . Is it possible 
since you have the original muffler that there might be a internal 
restriction . I know you can't very well open it up yet if  there is an 
internal loose pipe or carbon build up. I thing Russ has a few photo's of 
the inside of these mufflers on Samba.
  Everything that goes in air and fuel has to escape and if it can't it's 
back pressure . One way is to connect a vacuum gauge to the intake and watch 
it , if it drops down other than the usual changes at idle and accel this 
might indicate a problem.

 Since you have been dealing with rich running it's possible carbon has 
built up in the muffler or rust build up or a combination .

William

 I've not run into this on these cars but I have in older cars a few times .

William
----- Original Message ----- 
From: "Daniel Nohejl" <d.nohejl at gmail.com>
To: <type3 at vwtype3.org>
Sent: Tuesday, March 15, 2016 11:24 AM
Subject: Re: [T3] Bad day at the (FI) office


>
>> Sorry to hear that you're having what appears to me to be new
>> problems. It's certainly POSSIBLE that the "new" B brain which I sent
>> you is responsible. I'll get on some of the ones you've sent me, and
>> send some, including another "new" one, back to you ASAP. The only
>> testing I've done on any of my "tested" versions is to make sure they
>> would start and run a car.
>
> That’d be great. All I have right now is an A brain. All of my spare B's 
> are with you. Hard to believe that I had so many bad brains to send your 
> way. Was it 5 or 6?
>
>
>> It's quite likely that the hiss you're hearing is just the sound of
>> air slipping by the throttle plate at the front of the IAD. That's
>> normal. It's loudest at idle, when the vacuum is max and the throttle
>> opening is min. I'm hoping that you just forgot that it was always
>> there at idle.
>
> I never really knew exactly what caused the hiss, but there’s always been 
> one and I’ve never fretted about it before. Your explanation makes it very 
> clear why I hear it mostly around where the elbow meets the IAD. Jessica 
> and I both listened around with a hose and only heard it there. I was more 
> acutely aware of the hiss after having those issues yesterday and after 
> Sean asked about it. There are things one takes for granted as being 
> normal and they fade into the background until someone else asks if they’re 
> normal, at which point one sometimes wonders if they were ever normal to 
> begin with. If that makes any sense….Still, I’ll do the other tests you 
> suggested and check on the hoses. I’ll also look into the distributor and 
> throttle.
>
>> I don't think this is a simple vacuum leak. If it's a leak at all,
>> it's a leak that confuses the FI. A simple leak into the intake air
>> system would have different symptoms: the "loping" you're familiar
>> with.
>
> Right…..at the moment, it’s like the whole system “blinks” for a second. 
> Sometimes a few times in a row and other times there’s more than a minute 
> between blinks. At first I thought it was a voltage issue, then a fuel 
> issue, then a vacuum issue, and now I don’t know what it is.
>
>> I encourage you to disconnect wire 18, to the starter solenoid, the
>> TVS plug, and the pressure switch plug. That just takes those items
>> out of the picture, simplifying it. Leave those disconnected until
>> you have this sorted out, or until it becomes clear that
>> disconnecting them fixed the problem. If one of them caused the
>> problem, reconnect them, one at a time, one per week, until you find
>> the culprit.
>>
>> Our weather has been improving. Wish you were here….
>
> This can be done easily though after being burned so many times I’m a bit 
> reluctant to rely on this car for commuting and testing right now.
>
> If you weren’t 15 hours away…..though if you want to come to NY, I’m sure 
> there are at least three Type 3 owners who’d love to have you!
>
>
>
> Daniel
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