California, of course, which is one possible reason why it sucks.




rgs944, regarding the hall sensor... don't be surprised if the replacement hall sensor you get has a shorter cable than the original one. IIRC, when I replaced mine, the shorter cable on the new one was short enough that I couldn't get the connectors fastened on the bracket in the same orientation that they were originally; I had to flip them 180 degrees (hall sensor connector on bottom, I think). Unfortunately, I didn't get a "before/after" photo of the connections, but you can probably see the difference in the cable length here:

 

Hmmm. Wish I had taken pics of mine when we had it off. My car has option code C03 - California emissions, whereas most U.S. models have code C02. I've always wondered what the difference was, perhaps this is part of it.

 

There's pretty much only one thing it could hook to: the air pump diverter valve. I guess 49 States get one of the ports, while CA gets the other.

By '88 (probably mid-87) there's only one port and it gets hooked up to the air pump diverter valve.

 

I will spend most of my free time this week cleaning and inspecting while I wait for parts. Here is a pic of the intake cleaned up. I did touch up the lettering but otherwise I wanted to keep it mostly original. Thank you for the tip on the new sensor length. On the knock sensors one looked good but the other was freyed badly. Most likely they were not working.

 

It is possible. The trick is: loosen the screw and get as much slack on the cable as you can. Then insert the connector in the bracket and last, wind the guts of the sensor into the cover plate. It just barely works.

 

Dave...........from what I've read only one of the 2 underside ports are used the other is plugged.

Given the position of the throttle plate and its opening the difference between the ports is perhaps timing of vacuum to the diverter.

 

So you only replaced one knock sensor?

 

No, sorry for not being clear. Both will sure get changed as I am almost positive they are original.

 

Yup. That's what makes sense and what I tried to imply in my second post.

I would remove the "perhaps" from the above. That's the only thing that can be different and it's apparently a small enough difference that Porsche decided it didn't mater at all by '88 or thereabouts.

 

I have a late 87 and only one port. I think when they changed the fuel rail mounts they also eliminated the second port.

 

Amen brother!

John Leidel, your car is going to be a beast when you get back all that HP you've been losing to various things!

 

Hello rgs944,
Just read your post....sorry for the confusion about the Hall sensor. As Rob posted, I discuss the Hall Sensor in post #80 of the Intake Thread. I considered replacing it just to make sure I wouldn't have any problems with it in the future. However, the car only had 32K miles on it and the connector was in great shape - as can be seen from the pictures. I was told the sensor itself rarely fails and it's more likely that the connector fails resulting in engine timing retardation. Since the connector looked good, I decided to leave it in place. For peace of mind, one may wish to replace the sensor regardless. For me, I enjoy working on these cars and don't mind going in again when the sensor or connector finally does fail. Hope this helps....

 

Thank you Dwayne, That helps me a lot. I missed the reference in post #80 and will look again. Without your documentation this job would be much much harder. I am very appreciative of all your excellent work.

 

All I say is if you are not planning on replacing the Hall sensor, don't touch the connector... they have a tendency to crumble. The pictures in post #17 are mild compared to others I’ve seen.