[T3] Temp sensor and MPS problems on new motor

Jessica Chase jesassica at gmail.com
Sun Feb 28 18:30:32 PST 2016


Okay, so here’s a lengthy update on all the stuff that’s been going on!

The belt is a NOS 9.5x1000 Optibelt with only 975 miles on it. It’s v-shaped on the underside, has no teeth, and fits really well. We took off the pulley and it looks completely fine though the piece that slides over the woodruff key comes off quite easily if that means anything. Since Friday evening, we’ve gone out of our way to run the car with the lights on (even in the daytime) and the moaning sound hasn’t come back. What the heck?!?!

We had to push start the car again today. It took 5 tries to get it started cold. Then, we took a very short drive and after sitting for about 45 mins the starter would’t spin. Wire 18 isn’t frayed and when we turn the key the idiot lights don’t dim or go out. Any use in installing the Bosch hard start relay kit? We have one. Any other moves we should make? 

The starter is 311 911 023 B. It was hard to read the Bosch part # but it seems to be 0 001 211 012 then the Bosch symbol then 013. We could only see one brush, but from this part # can the correct amount of brushes be inferred? Oh, and here’s a picture of the starter body and another of what the connectors looked like. Altogether quite clean but after these pics I polished them up with 800 grit paper and put some dielectric grease on everything 

http://images.thesamba.com/vw/gallery/pix/1471142.jpg <http://images.thesamba.com/vw/gallery/pix/1471142.jpg>

http://images.thesamba.com/vw/gallery/pix/1471141.jpg <http://images.thesamba.com/vw/gallery/pix/1471141.jpg>

When we adjusted the pressure sensor last week, we went CCW to richen it. It seemed that we went too far as the AFR #’s were very rich and we got horrible gas mileage. Normally, we’ll fill up every Monday unless we go on a weekend trip. This time, we filled up on a Monday and had to refill on Friday morning. We used the same station and pump as always. After that, we went a tiny bit leaner (CW) to get an idle AFR of 13. We didn’t do enough driving after that to come to any conclusions. 

Today we disconnected wire 18, the pressure switch, and the TVS. The idle was a bit strange. It seemed to wander around a lot and the AFR #’s did the same thing. However, everything else was fine. In fact, the motor wasn’t underpowered at all. We hit 40 in 2nd gear with no problems! The AFR’s here were actually BETTER with everything unplugged than with it all plugged in. There was never a number higher than 15 for more than a split second. So what on earth does that tell us??? This is getting kind of maddening!!

With all of our pressure sensors, we’ve noticed that the AFR leans out under hard acceleration until the pressure switch kicks in. Then there’s uphill acceleration. We could be cruising at 13 but if we have to push it up a hill in 3rd, the AFR will spike into the 16’s. We’ve observed that on 2 different motors with 4 different pressure sensors and 2 different pressure switches! We’d gotten to the point where we just thought it was a system design glitch which may have been corrected in the C, D, and E systems. Now, we don’t know what to think. We didn’t push it uphill with things unplugged today but it seemed “healthy” when accelerating on flat ground!
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