[DML] Re: Fuel system questions
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[DML] Re: Fuel system questions

Hi Mike,

I know David T. can explain better than I how the system is designed and work.
However googling "CIS" will come up with lots of information on the design and operation of our car's Constant Injection System.

FWIW: I replaced my CPR=Constant Pressure Regulator (also called WUR=Warm-Up Regulator) with an electronically controlled on.
In this system the CPR has a stepper motor controlling the fuel pressure. The belonging electronics (hardware) comes in two versions.
One meant for replacing standard CPR (UTCIS-V), the other meant for replacing CPR on Turbo systems (UTCIS-PT). The latter however also may be used for non-Turbo cars and gives a better control over the range the system operates. It uses RPM and MAP input whereas the V-version uses none of these.
I have chosen the latter version for more accuracy.
If you're interested you can get more info from www.unwiredtools.com.

Hunting effects may be caused by vacuum or air leaks, bad CPR, wrong mixture etc etc. A systems with proper setup and no leaks can however run without hunting.
On DMCTalk there's a thread on various reasons why a CPR may fail. So it might be a good idea to search that forum too.



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