Where can I get my Bosch K Jetronic refurbished?

Larry Fletcher, he ships world wide. Flotech.com. Larry is more than glad to help you with advice also. I had him rebuild my WUR when I could not get a proper A/F curve. Fast service and reasonable prices. lost

 

Wrong web address (but right thought ) -- Larry's website is:

www.cisflowtech.com

 

believe that is link:

http://www.cisflowtech.com/

 

larry's the man. he's like a wizard. i've seen him fix these things by just touching them.

 

He is a remarkably likeable guy too.

 

Stephen,

There is a place in Nurnberg Germany but unless you have a HEAVY wallet that needs a LOT of lightening (THEY ARE VERY, VERY EXPENSIVE), go with Larry Fletcher.

 

be patient. he's really busy as it's just him and his wife doing everything.

 

+1000 Larry Fletcher. i did a core swapout and Larry is a great guy! i saw the before and after via dyno, Larry's rebuilt unit obviously fixed a small niggle.

 

also plus 1000 for larry!!
He is at sema this week so try to get ahold of him next week!!

 

Hi Stephan,
We have been out of town. But also we have never received a message from you.
If you are still having Problems please give me a call.
001-251-929-3771. I will do my best to help you get your Car running.
Greetings from sunny Alabama
Larry

 

Fletch is da man!

 

Isn't it the metering plate being pressed down that starts the fuel flow? (i.e. is that set up correctly or is it jammed for some reason?)

 

It sounds like possibly the mixture is adjusted too rich. This can make the fuel distributor feed fuel even when the air flow sensor is at rest position. It's worth gently adjusting the screw a bit at a time to see if this is the cause. A little adjustment goes a long way so keep track of how much you turn the screw. How did this problem originate?
Also, the fuel pressures, both line pressure and control pressure, are a great help in diagnosing this system and hooking a gauge up is not a big deal. It would be beneficial long term if you got a gauge for future problems even if only to help you to post pressures for further help.

TomB

 

Do you know if fuel is coming out of the injectors? I had one CIS car, not a Ferrari, on which the cold start valve had gotten stuck open. You can take an injector out and turn on the ignition to see if it's passing fuel. Be careful where the fuel goes, of course.

TomB

 

First, change your oil, it is contaminated with fuel and will not lube correctly. Next, you need a tool called a 'Colortune' (see ebay or the like). It will screw in place where a spark plug is and give a visual indication of the fuel and air ratio.

Now, that you have these accomplished it is time to setup the mixture of the CIS head. It is very common to have it badly out of adjustment when the CIS head is cleaned, injectors changed, warm up reg changed, or fuel pump renewed. It sounds like you've had several of these things done. We will assume you do not have access to the CIS pressure gage kit.

If you have cold start injection, remove the connector from the cold start injector at the air plenum, we don't want to dump fuel in at this point. Make sure your safety plug is connected to the CIS head so that the pump doesn't run constantly with the key on(causes flooding so bad it will run into the crankcase). Key off, battery fully charged.

At this point, you should have a car in which you can turn on the key, and the cold start will not run, and the fuel pump will not turn on until the starter is engaged. Install the Colortune in one of the rear plug wells and use the long black tube adapter and the spark extender that came with the kit. You should be able to look down the tube and see the glassine colortune element at the bottom.

The adjustment screw on the CIS head is located in a small well between the air metering plate and the distributor head. It takes a 3mm long hex tool. Look at the large round air metering plate with the air cleaner duct removed, and make sure it's resting on the stop at the top and not depressed at all. Tap it gently down with your finger a few inches, it should return to the stop smoothly with a very slight delay. It has a damper that inhibits air flutter from reversion, this is also moderated by the intake plenum and the intake flex tube. If this is working correctly you may proceed to adjust the CIS mixture screw.

Setting the initial mixture is easy. Remove one of the new injectors from the intake manifold. If you have removed the line from the distributor, reconnect it so you have the injector loose, and the line connected. Put the injector in a small cup so you can view it. Insert the 3mm hex tool in the CIS adjustment well, and engage the tool in the adjustment screw. When the tool is seated, there will be radial resistance felt, otherwise the tool is not engaged in the adjustment screw. The screw is very sensitive to adjustment. Perform the next step as quickly as you can.

Remove the Bosch elec safety connector from the rear of the CIS head. Turn the key to the on position, and listen for the fuel pump running. Check the injector in the cup, you will likely see fuel dribbling into the cup. The adjustment screw is: 'Lefty Lean, Righty Rich'. Turn the adjustment screw to the Left(anti-clockwise as viewed from above) until the fuel is not dribbling out of the injector and into the cup. If the fuel were not dribbling into the cup after a minute or so, press the air metering plate down slightly and see that fuel is dribbling into the cup, let it come back to the resting stop and adjust the mixture screw to the Left slightly. Key off.

Put the injector back in the intake, and re-connect the line from the distributor. Plug the safety Bosch connector back on the CIS head. Have the tool still in the CIS head adjustment. Hopefully the engine will start and run without the warm start injector being connected. Let's start with that. There should be some fuel in the cylinders already. It may take a bit of throttle playing to make the engine start. Look at the colortune, and adjust the mixture based on the legend. If it is very yellow(likely) make the adjustment to the Left to lean the mixture. If it is blue or white, you may need to adjust it a bit to the right. Try to stay as lean as possible to start with and get the extra fuel out of the engine. Allow the engine to warm up normally with the tool still in the CIS head. Do not exceed 1800RPM.

Once the warm up regulator has warmed up fully, it's time for final adjustment. Set the throttle to about 1400-1600RPM so that we are away from the idle set point. Turn the adjustment screw very slowly Left until the engine just starts to die from fuel starvation. The Colortune will be white, and you will see it missing on some strokes. You will also hear the engine popping a bit which is lean-misfire. Now, very slowly turn the mixture screw adjustment Right, or Rich and monitor the Colortune. You will see it change from white to blue. At this point, you are in the correct zone. Small changes will be needed for final adjustment. Once you have the Colortune set between blue and white, shut off the engine, remove the Colortune, reinstall the spark plug, connect the warm start connector to the warm start injector and connect the air cleaner duct to the CIS head.

Drive the car, and see if it will accelerate in 2nd gear rapidly. If so, you are done. If you hear popping, or if the car is running hot, you may to adjust the mixture very slightly right to make it a bit richer. Do not adjust it much.