Special CIS Screwdriver? Any ideas?

[Ferrariguyma]

I am having cold start and now hot start "issues" with the CIS in my 1978 RoW SC.

In reasearching the problem a Bosch book references a special tool. There is a mixture adjustment screw that is buried in the fuel distribution unit. They said that you need a special screw driver to get at it ( seems silly to me, maybe they don't want the average Joe reaching in there and messing with using a pocket knife). I would like to purchase this tool or or maybe somebody has an easy trick for making your own out of an old screwdriver.


Thanks!

Andrew

[MotoSook]

just use the 3mm L-shaped allen wrench out of your Craftsman set...or get one. The "L" should be about 5 inches long or so to get to the screw.

[Superman]

Yes, a 3mm Allen tool works fine, but it has to be just about EXACTLY the correct length to turn the corner and get in the hole.

[Ferrariguyma]

Once again Pelicanites come thru! Thanks guys!

[MBEngineering]

HI the tool you require is P377 which is 104mm long 3mm allen key and 'T' top of 4mm round bar 40mm long welded on the top.

regards mike

[Bill Verburg]

This is the special CIS tool


Souk's suggestion works just as well.

[Ferrariguyma]

http://www.autotech.com/prod_engine_fuelinj.htm

[MBEngineering]

HI a Tip for you when adjusting the CO% with the tool, do NOT leave it in between adjustment as the weight will change the CO%, and also, always adjust from weak to rich as the adjustment relay arm with the adjusting screw in sticks and will drop when you don't want it to, then the engine will run on a weak setting. Adjust the CO% from weak to rich and rev' the engine between each adjustment to settle the sensor plate arm, make the adjustment as quickly as pos' as not to let the intake manifold get to hot and alter the CO% setting with heat transfer to the injectors.

regards mike

[Ferrariguyma]

Andrew

[azasadny]

Mike,
Thanks for the tip about not leaving the tool in place between adjustments. Maybe that's why I had trouble setting the mixture correctly...

[1982911SCTarga]

Personally, I wouldn't go tweaking the mixture adjustment without knowing my system, cold and hot pressures relating to starting and driveability issues. Buy a CIS gauge first before setting forth with the allen wrench. I don't understand why guys are so quick to fool with the mixture. Become a Porsche physician: "Do no harm."

Brian

[ruf-porsche]

Originally posted by 1982911SCTarga
Personally, I wouldn't go tweaking the mixture adjustment without knowing my system, cold and hot pressures relating to starting and driveability issues. Buy a CIS gauge first before setting forth with the allen wrench. I don't understand why guys are so quick to fool with the mixture. Become a Porsche physician: "Do no harm."

Brian

I agreed with you, so many time Porsche Owners think that they can fix a cold start, hot start, driveability issue by just tweaking the mixture. They end up ******* it up even worse. The 3mm wrench is just part of the equipment needed to set CO, the other piece of equipment is a CO meter which most people don't have.

[MBEngineering]

HI ruf-Porsche to add to your list of tools needed, is a Fuel Pressure Gauge P378 with adapters, to check the system and control pressures, before you do any CO% adjustment, cold and hot. Do not forget the info book "troubleshooting guide K-jetronic" part No 4533.20

regards mike

[1982911SCTarga]

To add to your list of tools needed, is a Fuel Pressure Gauge P378 with adapters, to check the system and control pressures, before you do any CO% adjustment, cold and hot.

Or this.

Keeping things stoichiometric,
Brian

[emac]

Mike

Good tips --- but also remember NEVER blip the gas with wrench in place. You could bend the plate

[mack6820]

I just received the tool from Pelican. Is there a reason why mine is 6 inches long? Do I need to cut it? it doesnt fit.

[timcantrell]

Listen to the guys who tell you not to adjust it until you figure out what is going on. My cold start issues in the past have centered around a bad warm up regulator. Somethime cold and hot start issues are the cause of a bad fuel accumulator. I personally would not start adjusting the fuel mixture until you check out the system pressures, make sure the filter is clear and the warm up regulator and fuel accumulator are good.

[john walker's workshop]

i get the 5" or 6" long 3mm allen socket replacement bits from the tool truck, heat red where i want the length and bend 90° for the handle.

[T77911S]

Originally posted by timcantrell
Listen to the guys who tell you not to adjust it until you figure out what is going on. My cold start issues in the past have centered around a bad warm up regulator. Somethime cold and hot start issues are the cause of a bad fuel accumulator. I personally would not start adjusting the fuel mixture until you check out the system pressures, make sure the filter is clear and the warm up regulator and fuel accumulator are good.

i agree with RUF and 82SC, dont jump on the mixture! if it IS right and you tweak it, you have just added another problem. i have seen some good engine guys that are unable to set it by ear. as souk said, the craftsman allen that comes in the set works fine.
a new WUR curred my starting issues as above.

[mack6820]

I just thought it was weird that I bought a factory tool from Pelican and it was too long. I had to cut an inch off of it to fit.