Re: Please confirm a bad differential pressure regulator

["Joe Doty" <rocco2nr@hotmail.com>]

I'm really doubting that it is the DPR.  They arent exactly known to go bad.

A more in-depth description of the problem would help, i.e. how does it 
perform warm vs. cold, is it sputtering, etc.

Check your intake boot and vacuum lines to see if there are any leaks.  If 
you havent ever done it, replace the injector o-rings, they are probably 
cracked and dry.  Even if it doesnt fix the problem you will notice an 
increase in power.

Also check/beef up your grounds (on the back of the intake manifold).  Run a 
ground wire from the case of the alternator to the negative battery 
terminal, that should help with cold starts.  Make sure that when the 
throttle is all the way closed, the little microswitch on top of the 
throttle body is clicking.  And last but not least, check/replace your idle 
screw o-ring.

Fuel items like distributor/DPR/airflow plate generally dont go bad...its 
probably one of those little maintenance items.

Good luck
Joe

>Hi all,
>
>	I decided to work on the 'Roc today.  Car in question is an '86 1.8 16v.
>The problem has been a loss of power over time and hard starting.  I 
>started
>with basic tune-up stuff (plugs, cap, rotor) and took care of the leaking
>distributor.  The plugs indicated a rich condition.  I went to test the O2
>sensor and got a reading of 20.1 mA.  I replaced the O2 sensor and got the
>same reading with the new one.  I used the same harness to check the
>resistance of the differential pressure regulator.  According to Bentley, 
>it
>should read 19-22 ohm.  If I'm reading it right, my multimeter is telling 
>me
>resistance is upwards of 1500 ohm.  That seems way off, so I think I'm 
>doing
>something wrong.  Not being a multimeter guru, here's what I did.  Set the
>meter to 2000 ohm, which should be reading 1 - 19.9k ohm (according to the
>manual).  Put the meter in series with the test harness (wire into meter,
>meter into regulator).  Tested with ignition and engine off.  So is my
>regulator shot or am I screwing this test up?  Would a bad regulator cause
>the O2 sensor to read high?  The interesting thing is the O2 reading is in
>the range that it should be if the green wire from the O2 sensor is 
>grounded
>(open-loop?).  Any help would be appreciated.  TIA.


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