[DML] Re: CPR Testing

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

What were the origional symptoms that are causing you to suspect and
test the CPR? Not all cold start and warm-up problems are related to
the CPR. It is adjustable , just not on the car. If it is way out of
spec sometimes it can be "fixed" by cleaning the screen on the inlet.
On some the wiring inside burns up or comes loose. On some units
insects get in the vent and crud up the insides messing with it's
operation. Best not to fiddle with the internal adjustments. Just
clean it out inside and fix the wires if necessary. If that doesn't
help just replace it. The venders offer new and rebuilt. Rebuilt is a
LOT cheaper and just as good. You have to send the old one back for
credit after you replace it (if you choose the rebuilt). Since your
car had the turbo set-up make sure all the vacuum lines are done as
per "stock". The CPR changes fuel pressure in relation to engine
temperature (from the valve cover), vacuum, and engine on time (by the
heater and bi-metal element. There is a round check valve, make sure
it is installed in the correct direction. You need to check all this
out before condemming the CPR. If you do not them replacing the CPR
may not fix your problem.
David Teitelbaum
vin 10757



--- In dmcnews@xxxxxxxxxxxxxxx, "drdhdmd" <doctorDHD@xxxx> wrote:
> I am trying to test my CPR and have the CIS pressure tester.  With
> the 
> engine off at 80 degrees F, I get a system pressure reading of 72psi 
> and a control pressure of only 30psi.  According to the graph in the 
> manual it seems like the control pressure should be between 35 and 40.
> 
> Is this adjustable? The Bosch Fuel Injection book 
> by Watson says it is caused by a defective CPR. Can it be fixed?
> 
> Could I be doing something wrong in my measurement technique?  It
> seems 
> rather simple. Engine off, gauge attached,  RPM relay jumpered.
> (The technical information manual says to disconnect the intake 
> manifold vacuum hoses but with the engine off I can't see how this 
> could affect it...and it does not.)
> 
> What would a low control pressure when cold cause?  Excessivel rich 
> mixture, correct?
> 
> Any thought and ideas are welcome.
> 
> D² & 6530
> Dave Delman






To address comments privately to the moderating team, please address:
moderators@xxxxxxxxxxx

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/dmcnews/

<*> To unsubscribe from this group, send an email to:
    dmcnews-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/