[Shotimes] CPS Failure Mode Confirmation

[Leigh Smith]

I read two conflicting symptoms:

No tach reading is classic symptom of CPS failure, since it is the
signal origin for the whole system. Ditto with the sudden stall.

Hard start with a tach reading sounds like a CMP, the CPS must be 
working or you would not get tach.

CMP should not cause stall, technically, but several listers (see Eric) 
have reported both dead tachs and stalls when CMP dies. Maybe it "shorts 
out" or something.

If you are sure you got a tach reading at least once, I'd try the CMP 
first. You could always just unplug it and test run the car without the 
CMP. It may take 2 or 3 starts but should then be O.K.

Leigh

kpdfamily@netzero.net wrote:
 > After reading of CPS failure for the last 4 years it appears that I
 > now have one of my own.  I just want to confirm that this is the case
 > before I replace it.  Symptom is the vehicle will stall (check engine
 > light comes on), with the vehicle travelling 50 MPH (MTX still in
 > gear) and the engine spinning at 2000+RPM the tach reads zero.  Car
 > will then suddenly come back to life and run normal.  It did stall
 > once on a side street and wouldn't start for 10 minutes.  On this
 > occasion when cranking the tach would read correctly but the engine
 > wouldn't fire.  Opinions?
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