CIS rebuild service

[LV911]

Looking for a recommendation for a CIS rebuild service

[jameshtaylor]

Have never heard of one. The CIS system has a large number of components most of which are replaced or sometimes rebuilt by individual mechanics. There seems to be some controversy about whether you can clean or must simply replace individual injectors. Fuel distributors are regularly rebuilt, some more competently than others. Other pieces are mostly replaced. Your best bet is a mechanic with lots of CIS experience.
It would help if we knew the year of your car and its location. Someone here may know who to send you to.

[Jay Laifman]

Just some points to help or warn you. I went through a lot of frustration trying to figure out why my 73.5 was not running well. In the end it was THREE bad rebuilt warm up regulators that were sold to me by mainstream vendors that you would think would have quality parts.

The worst part was that it wasn't like we would put it on and find it bad. We'd put it on, it wouldn't change anything, and we would go around for a long time again trying to find out what else it must be. And note, the pressure testing of the WURs made them seem ok. But in the actual full range of actual operation, it wouldn't work right.

In the end, the one place that actually was able to help me out is Schneider Autohaus in Santa Barbara. I was referred to them by Bosch itself when I contacted Bosch for help, in desperation. I've been a loyal customer ever since.

[LV911]

Thank you guys all great info !! My car is a 73 911 T & I'm Las Vegas.

[edmayo]

Just for information on a customer 73 recently I needed the throttle valve compensator, STILL available from Porsche, however the warm-up regulator is not and they are not rebuildable. I was very lucky to find a good used from another shop!

[Jay Laifman]

When we were going through this, when we finally realized it was from bad WURs, my mechanic did indicate that there is a new adjustable WUR out there that we were going to try if the last WUR we bought didn't work. It worked, so I never got to the adjustable one. I sometimes think I should get one for the "just in case" shelf. I don't know where to find it though!

[Flat Six, inc.]

As Ed implied. The early CIS stuff is getting hard to find. Just make sure everything else is in order before going after the CIS...air leaks, timing, points (I like Pertronix conversion), fuel mixture...the basics.

Also, I like non-oxygenated fuel in CIS cars...if you can find it. And keep in mind, they will most likely not run as a new modern car. I always tell people they can be a little quirky...like between a new Honda and a car with carbs. Somewhere in between, but overall, very nice to drive.

[jameshtaylor]

If you are a 73T with CIS, I think you are what is always referred to as a 73.5. After a few months of experience there were several small changes in the CIS for 74, so your set up is distinctive... ie has parts that are different from later versions. The injectors for the 73.5 for example are different from those delivered a few months later. One more reason to find a competent mechanic who knows these old systems. Tip: he'll be over 50! Schneider Autohaus mentioned by Jay above has one of these.

[Jay Laifman]

For anyone's future reference, I just came across these to make your own adjustable WUR:



http://forums.pelicanparts.com/porsc...ed-my-wur.html

http://forums.pelicanparts.com/porsc...-got-pics.html

http://forums.pelicanparts.com/porsc...-got-pics.html

http://forums.bimmerforums.com/forum....php?t=1175959

[RSTarga]

Just for information on a customer 73 recently I needed the throttle valve compensator, STILL available from Porsche, however the warm-up regulator is not and they are not rebuildable. I was very lucky to find a good used from another shop!

Hi Ed,
Do you have any experience with this guy? He says he rebuilds others besides 930 WUR.
http://www.930wur.com