Checking the fuel distributor of the Bosch CIS (K-Jetronic)

And to our big surprise it worked on the first try, after having been sitting since 1993

Category:

Autos & Vehicles

Tags:

• Bosch
• CIS
• fuel
• distributor
• K-Jetronic
• Mengenteiler

[TradingCarz]

@SBT300 i have an 83 Scirocco with this type of injection system...any tips you have for cleaning the system and removing it?

[SBT300]

@TradingCarz Do not take the fuel distributor itself apart. You can use standard carb cleaner.Other than that? Be careful and do not break anything ;-)

[RzXVeRSaTiiLe]

Hi i have a 84 500 sec very clean but it has been sitting for a while and now i've gradually started driving it daily for maybe an hour a day. it drives smooth and shifts smooth but the only thing it has a little hesitation at the idle like it will be calm then kick every once and a while? i want to rebuild my fuel distributor myself any suggestions?

[SBT300]

@RzXVeRSaTiiLe Don't take the fuel distributor apart. Afaik they have no gasket as the metal parts are mated together with the thin stainless steel plate of the distribution valves in such way in the plant, that they are tight by themselves. You can't do that yourself I was told, and I never tried...

I would treat the distributor with lots of carb cleaner, and mount new injection valves. Also check all the pressures to be sure it's not simply a pressure issue.

[mikethebrick]

hi i have a 76 350se been standing since 1995 put a new fuel put on it but can only get it running on 4 cylinders the off side the near side wont fire I think its some to do with a little valve at the front of the engine any ideas ?? thanks mike

[SBT300]

@mikethebrick If they are all injecting, and still your engine is not running on all cylinders, there is a problem with the ignition timing or something mechanical like no compression, engine valves...

[TradingCarz]

@SBT300 i recently just took out the injectors and gave them a good cleaning, now it runs alot better!

[RzXVeRSaTiiLe]

@SBT300 thank you very much and i will.

[SBT300]

@mikethebrick If you see visible differences in the fuel quantity coming out of the 8 ports, your distributor is not working correctly. You can try to clean it as I described below. If there seems to be the same quantity coming out of each port, remove the injection valves from the engine, connect them to the lines (hanging in the air) and see if they are all injecting. If not, putting them into a supersonic cleaner withpetrol and inj sys cleaner can do the trick.

[SBT300]

@mikethebrick Hi Mike, all devices on the K-Jet have the same effect on all cylinders - except the fuel distributor and the injection valves. So if your engine is mechanically ok, and the ignition system is ok; and the engine is not running on all the cylinders, it's the fuel distributor or the injection valves. You can disconnect the lines going from the distributor to the valves, bridge the fuel pump so that is runs continuously and then push down the air flow meter plate.