Testing and cleaning fuel injectors

are you testing new injectors as well?
any idea on the fail rate for new injectors?
rgds,
Vincenzo

 

AWESOME!!!

What a fantastic post.

 

Hallo Geert Jan, wel een beetje opletten met die benzinedampen zo dichtbij die electriciteit, één vonkje en ...
Verder een compliment, goede setup om dit mee te testen! En de groeten uit Amsterdam.

 

Soooooooo Frankenstein! Did you frighten your neighbors?? I love it

 

I made a similar version without a fuel pump- I used my air compressor and a shrader type tire valve in the top of a 2 liter glass pickle jar to pressurize the jar (half filled with an injector cleaner and fuel mixture) to 125 psi. Another outlet valve on the jar top (with a pickup tube almost to the bottom of the jar) was then plumbed to a very similar looking stand that would hold each injector into another big jar so I could see the mist pattern and measure the flow vs. time. I opened and closed the injector with a 9 volt battery on a switch which sufficed.

Worked great and I got all the injectors on my old SL crystal clean this way. Geert's is more elegant with the fuel pump- but I'm cheap and thsi worked just great.

Nice DIY-

 

I too have built a similar system. Mine used compressed air as well, and an old Sure-shot.

The bosch tool uses a hand pump. They come up on e-bay from time to time, but they are becoming rare.

My only concern is for your safety. The bosch fuel pump will draw a considerable amount of amperage. So, there's a potential for spark should your alligator clip become disconnected during a test. And, it looks to me like you are using gasoline, so you are creating vapor. Vapor + spark, well you know the rest. My advice would be to use mineral spirits for all of the tests (per bosch test procedures).

Live long and prosper.

 

I have to say that was my concern too. But big credit for rigging up such a system!

 

Geert Jan,

Ingenious....

Take care though

 

Excellent test set up Geert Jan.

I may make one of like kind when I improve my fuel system.

Rob H.

 

I went through this exact same issue with these Bosch injectors on a porsche 930...

I created a flow test (pressurized canister filled with injector cleaner)...

I tried backflushing the injectors...that was fruitless...

I tried ultrasonic cleaning...made no differnce on the bad injectors...

Here is what I figured out....

1) Take a can of carb cleaner, wit the red straw, and shoot it thorugh the injector - if you get a nice pattern and the injector "hums"...you are fine...

2) If you get a poor spray pattern... You can try back flushing. You can try ultrasonic cleaning... But it probably won't work. The proffesional injector cleaner specialists gave up trying to clean these injectors...and I now know why...

3) I have seen new injectors on the net for $50... The ones for the 930 are $120 each as they screw in... Hence, I spent 2 weeks trying to clean them out...it was not successful.

Tons of threads on this on pelicanpartsdotcom... A non competing porsche site ....

 

Coarse thread, brass jacketed, CIS nozzles are a whopping 10-20 dollars each...
these are routine service replacement parts for CIS cars as a function of TIME as well as miles...
why would you spend all this time money and effort to "test" an interval service, replacement part?
Just change them...typically, with the advent of the hi alchohol content gasolines(2,5- isopentanes), thes rate of decay is at best 5 years, and dependign on your fuel supply, and vehicle use history, will be as low as 2-3 years.
This, by the way, is viewed through the prism of ther BOSCH CIUS system apps, NOT strictly limited to Ferrari apps.
As a former M/B shop foreman, Ferrari dlr. Driveline overhaul, and EPA certified emissions Laboratory research director, I can assure you that the majority of runnign problems which you seek to :view", cannot be done so with youyr setup..."break pressure" pintel drip, and seat seepage simply cannot be reproduced without a pressure pump such as the Bosch Factory tool...there is a reason which they designed it as such...afterall...