Bench test CIS components

[davis911s]

I have searched but can't find a thread on how to bench test the components of CIS. I have 3 sets and would like to check all the parts and TRY to get my car running before I give up on CIS and go to Carbs or megasquirt

[pete3799]

The Bentley manual has all the test procedures.
What are you wanting to test? More to the point.....what is the problem you're trying to remedy.

[boyt911sc]

Originally Posted by davis911s

I have searched but can't find a thread on how to bench test the components of CIS. I have 3 sets and would like to check all the parts and TRY to get my car running before I give up on CIS and go to Carbs or megasquirt

davis,

Do you have a fuel injection pressure gauge kit? It is mandatory to have one to be able to do a meaningful diagnostic test. What particular CIS components you want to test? I might be able to assist you in case you need some help. Keep us posted.

Tony

[davis911s]

Originally Posted by pete3799

The Bentley manual has all the test procedures.
What are you wanting to test? More to the point.....what is the problem you're trying to remedy.

I have a few spare AAR, WUR, FPR everything, but don't have the Bentley. If possible I would like to bench test the spare components when they are out of the car, and if the test good put them in.

Here is a link to my no start issue I am working on

77 CIS no start!! Fuel pump??

Originally Posted by boyt911sc

davis,

Do you have a fuel injection pressure gauge kit? It is mandatory to have one to be able to do a meaningful diagnostic test. What particular CIS components you want to test? I might be able to assist you in case you need some help. Keep us posted.

Tony

I do have a pressure gauge. Parts I would like to test are mentioned above.

[boyt911sc]

Shawn,

Everything you wanted to know and learn are discussed very extensively in the previous posts. Search for 'CIS troubleshooting' and read the posts. Search for 'Ossiblue's and T77911S' posts' and by the time you finish your reading, you'll be an expert in the field. Keep us posted.

Tony

[T77911S]

the AAR, AAV, TTV, TTS can easily be tested out of the car with a battery, but, these will not keep the car from starting, except the TTS, which works with the CSV to provide fuel for cold starting.

the easiest way to test the WUR is in the car, even a car that does not run. you just need to run the FP. you can check the function of the vacuum diaphragm by removing the vacuum from the WUR while monitoring warm CP. WCP should drop around .8 bar.

to start the car, you really only need the WUR, FP and of course the FD and injectors. you can perform the job of the CSV/TTS by lifting the air sensor plate with the FP running to dump a little fuel in the combustion chamber.

but, you DO have to have CORRECT fuel pressures and mixtrure. you can side step the mixture if it is not correct by lifting or pulling down on the air sensor plate as someone starts the car.. this will change the mixture without messing with the setting.

and of course you need to fix air leaks and have a proper working ignition.