Fine Tuning

There are a few fairly minor issues driving me nuts that I am addressing.
1) I've been experiencing occasional bogging of the new motor off a dead stop. 2) Also, it has been idling rough and sporadic. 

3) Prior to the rebuild while in first or second gear at low rpm's the bus would buck as if the throttle was revved and let up. The only solution while driving was to depress the clutch. This seems to have gotten worse since the rebuild.

 I first tried replacing the Signal Filter for Air Flow Meter . This had little if any noticeable effect on the performance of the motor. 

Aftre a lot of thought and reading I decided to replace the Fuel Pressure Regulator. Today I received the new Bosch Regulator and installed it. Immediate much improved idle, and acceleration off the line .

Here is the new Fuel Pressure Regulator installed.

My great friend and VW aficionado , Chris, has been insisting that the Catalytic Converter is the source of the problem.The new higher c.c. motor and the larger stainless steel exhaust is restricting the flow of exhaust gases because of the cat. So, today we also removed the cat. and gutted it and reinstalled it. Another huge improvement in performance. The engine is now receiving fuel and breathing.

Gutted Cat.

Changing out the Regulator and augmenting the Cataylic Converter has solved the acceleration problem off the line. The engine revs much more freely and quickly. A dramatic improvement !

Thanks Chris !!

 Now to smooth out the idle. I am going to change out the Idle Control Air Control Valve, except no suppliers seem to have it in stock...I'll have to wait. Slowly getting her running like a top.

The lunging or bucking problem could be caused by a bad transmission mount. I have inspected it and watched it during a forward and reverse start. It seems okay. I need to think this one through.

As of today, we have 109937 miles on Jesse.

We have logged 3365 since the rebuild. I have changed the oil and filter 4 times. The first time at 47 miles. I switched to synthetic Redline 15W50 at 1500 miles since rebuild.