CIS is out what should I replace

[duke3282]

I removed my CIS to try and fix some vacuum leaks in the intake sleeves and between where the top of the airbox screws to the bottom of the airbox. I am planning on replacing the intake sleeves and the intake gaskets. Are there any other gaskets, hoses, or other maintenance items that would be particularly easy to access while the CIS is out of the car.

[Porsche-O-Phile]

All the lines and connectors. I would also replace the injector seals & sleeves.

I feel your pain, I had to yank all my CIS crap to repair a broken lower air box, this is going on two months ago now.

[dtw]

-Injector sleeves and seals
-Intake runner to airbox sleeves
-Pattern-test injectors
-Is pop-off valve present? If no, install. If yes:
-Is pop-off valve epoxy in good condition? If no, re-seal
-Renew all vacuum lines
-Check main injector lines, replace if condition warrants or upgrade to metal lines
-Replace any broken/failing/hardened rubber isolation mounts
-Rebuild/replace supply/return/cold start and other fuel lines
-Intake runner gaskets

Not CIS but other things you can do while the CIS is off:
-Replace oil pressure switch
-Replace thermostat o-ring
-Replace breather hoses as necessary
-Replace throttle bellcrank bushings as necessary
-Inspect under shroud (no debris underneath that is blocking air)
-Check resistance on plug wires, replace as necessary

[DavErb]

Were you able to extract the CIS with the engine still in the car or did you have to drop the engine?

[duke3282]

I was able to do it with the engine still in. It was a tight fit but with some effort I was able to get it off. Make sure all of the wires connected to the back are disconnected, I yanked on some of them pretty good before I realized that they were still attached, but I dont think I broke anything. As stated in previous posts it is much easier with a swivel socket. It also helped to take off the front intake pipes to get better access to the back. I ended up cutting the hose clamp off of the oil return hose since it was facing the back and I couldnt get screwdriver on it. I am just hoping that it will go back in.

[duke3282]

Thanks for the list dtw, I hopefully wont have this much access for a while

[boyt911sc]

Duke,

While you were able to dismantle your CIS unit with the motor in the car, putting the components back is a totally different ball game. The time and effort you would have to finish this undertaking is a lot more (many times) than having the motor out. Of course, there are several ways to do a job, and this was your choice. I'll be very interested to follow your work and hopefully a successful one. Keep us posted. Good luck.

Tony

[patkeefe]

I agree with Tony. Life is much easier if you drop the negine.
Pat

[JohnJL]

You should replace the CIS ;-)

[MotoSook]

There is a foam gasket between the air meter and the airbox, replace it. Also, while you have the air meter off, you should clean the fuel distributor. Be careful you done damage the plunger. Somewhere in the archives I docoumented my CIS total disassembly and cleaning. It's been years since I posted..maybe it's been wiped I'll link it if I can find it.

[duke3282]

After I finally got everything out I wondered how difficult it was going to be to get everything back in. Oh well I guess I will find out. I will keep you posted on the progress

[stlrj]

It would be much easier if you did a partial engine drop by lowering the the rear of the engine 6" to give you all the space you need.