<div dir="ltr">I suppose anything is possible. Mine only has the one allen screw the original had a flaw screw. The enrichment is done via the TPS on a 73 and 72. It's an E system. I just need to be sure it's not some wiring issue I might have missed in 2009. I have two newer MPS units and one is only different by the last letter and it worked fine I put the proper new E MPS in and didn't get much of a change. The main thing is since I fixed all possible vacuum leaks which are supposed to make it run rich if they leak it's worse now with TS1 connected. It's been acting up since 2009 always had the erratic miss only at idle. Before I mess with the MPS adjustment I need to be certain there is not an issue anywhere else. If I don't and even if I mark the MPS and set it back it might be worse. Or I just masked the real problem . I realize the fuel is not the same as it was in 2009 when I first noticed this miss and unplugged the air temp cured it which seems to indicate it's lean yet not by much or TS1 out of the picture would not make such a drastic difference. I know the AAR was not closing and fixed that and it helped at least give me a RPM that was consistent once it closes. If I cannot find any issues then I will adjust the other MPS I have with the D letter at the end rather than screw up the proper one since it ran about the same with either one. The main thing to me is this was not a gradual change in 2009 when we had the same fuel it was sudden. Certainly fixing any and all vacuum leaks changed things it made it worse with TS1 in the mix the same with TS1 out of the mix. <br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Sep 14, 2019 at 5:58 PM Keith Park <<a href="mailto:topnotch@nycap.rr.com">topnotch@nycap.rr.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Todays gas is drastically different than when these car were new, I had to<br>
go up 2 jet sizes on the crate to make it run properly with todays gas, and<br>
yea, Ive had to tweak the MPS over the years to get it right. I recently<br>
got a stock MPS for the 2L 914 and it was WAY WAY lean on my 2056 right out<br>
of the box, I expected a little lean but it was several percent off.<br>
<br>
Keith<br>
<br>
<br>
-----Original Message-----<br>
From: <a href="http://type3-vwtype3.org" rel="noreferrer" target="_blank">type3-vwtype3.org</a> [mailto:<a href="mailto:type3-vwtype3.org-bounces@lists.vwtype3.org" target="_blank">type3-vwtype3.org-bounces@lists.vwtype3.org</a>]<br>
On Behalf Of <a href="mailto:bobsnotch@aol.com" target="_blank">bobsnotch@aol.com</a><br>
Sent: Saturday, September 14, 2019 4:24 PM<br>
To: <a href="mailto:type3@vwtype3.org" target="_blank">type3@vwtype3.org</a><br>
Subject: Re: [T3] On my 73 square<br>
<br>
Personally I think it's time you got with Ray Greenwood, and adjusted <br>
the MPS. I watched Keith do it sitting at a picnic table back in 2010, <br>
when he was fine tuning on his 71 Square. He had out his note book, <br>
as he was data logging any and all changes. He wasn't using anything <br>
fancy, just the data he had already logged into his book.<br>
I believe Phil also tweaked his MPS, but that was after he bumped up <br>
the engine size in his Fastback.<br>
Keep in mind that it's not a set and forget change deal. You set it close, <br>
then fine tune from there. Even Tram has adjusted the MPS before, but, <br>
he uses a sniffer to set them. I think you've tuned on every other part of <br>
the system trying to fix this, and you're down to this last part.<br>
However, I don't know IF adjusting the MPS will fix your "miss at idle"<br>
issue.<br>
Bob<br>
-----Original Message-----<br>
From: William Jahn <<a href="mailto:willjahn975@gmail.com" target="_blank">willjahn975@gmail.com</a>><br>
To: type3 <<a href="mailto:type3@vwtype3.org" target="_blank">type3@vwtype3.org</a>><br>
Sent: Sat, Sep 14, 2019 2:22 pm<br>
Subject: Re: [T3] On my 73 square<br>
<br>
Jim I agree I too feel it's running lean mainly because as you said the<br>
unplugged TS1 does make it more rich .<br>
<br>
On another site which I shall not name I am constantly told to adjust the<br>
MPS which is not something I care to do , I feel it will just make things<br>
worse. It might be a last resort if everything was proven to be in spec if<br>
one had a sniffer. The issue I have was not gradual or a long term change<br>
it was more or less sudden.<br>
<br>
<br>
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