RE: [DML] RPM Relay/ECM/Pulse generator Diagnostics

["Joseph Kuchan" <josephkuchan@xxxxxxxxxxx>]

Just put a timing light on the car and crank it. If the problem is that the 
rotor is pointed in the wrong direction it will still flash, just not when 
the timing mark is at TDC for #1. There are two marks on the crankshaft 
pulley. One is for cylinder one and the other aligns with a different 
cylinder. (Probably #3 or #6) Unless anotherr cylinder is 180 degrees out 
from cylinder 1 you should be able to just hook up to cylinder one and see 
if the light flashes when either mark is at TDC for #1. If not, then that is 
most certainly the problem.

-Joe Kuchan

>From: "Tom Tait" <TTait@xxxxxxxxxx>
>Reply-To: dmcnews@xxxxxxxxxxxxxxx
>To: <dmcnews@xxxxxxxxxxxxxxx>
>Subject: RE: [DML] RPM Relay/ECM/Pulse generator Diagnostics
>Date: Wed, 6 Jul 2005 10:05:10 -0700
>
>That sure sounds like it could be it - will try to check it in the next day 
>or two.  Off with the fuel metering unit - again.
>
>If I want to turn the engine by hand to check the mark on the pulley, do I 
>need to remove the plugs to prevent compression?  I assume I have to take 
>out the muffler and heat shield to get a wrench on it.  Anyone know the 
>size of the nut?
>
>I really appreciate the help on this.
>
>Tom
>
>-----Original Message-----
>From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of 
>Bernie
>Sent: Tuesday, July 05, 2005 3:22 PM
>To: dmcnews@xxxxxxxxxxxxxxx
>Subject: Re: [DML] RPM Relay/ECM/Pulse generator Diagnostics
>
>Check your rotor, and make sure it's on the right way.  I have had it 
>happen to me before (not on a DeLorean) and it's really embarresing, flip 
>it 180 and the engine starts.  Just give it a quick check.  All of your 
>symptoms point to it.
>
>Bernie
>
>--- In dmcnews@xxxxxxxxxxxxxxx, "Tom Tait" <TTait@xxxx> wrote:
> > I'm concerned because my failure coincides with replacing the cap
>and rotor and I'm afraid I disturbed something at the distributor, When I 
>last had time to look at the car a few days ago (my wife is sick so the car 
>is on the back burner for a bit)  I was able to determine that the RPM 
>relay was not closing, but was getting a 3 volt DC signal as read by my 
>meter.  I now understand that the signal is a pulse and cannot be read 
>realizably in a DC voltage mode.
> >
> > I'm happy to replace the relay, and am looking at the upgraded
>relay from SpecialTauto,  but I'm really more concerned that I screwed 
>something up elsewhere.  My understand was that the signal went from the 
>distributor to the ECM and then to the relay.  I'd love to verify proper 
>operation of each of these components.
> >
> > What do I really need to do?  Check Ohm reading at the rear
>firewall connector and verify 600 ohms - right?  At all times or only when 
>cranking?  This tells me the distributor is ok, but maybe not the ECM?  I 
>do suspect that I need to reset the timing at the distributor - when 
>installing the cap I inadvertently knocked the Rotor, although I tried to 
>put it back in its original position I probably screwed that up.  Could the 
>timing being out cause the RPM relay to malfunction?
> >
> > It just seems like a heck of a coincidence that I would lose an
>RPM relay while messing with the distributor.
> >
> > Tom
> >
> > -----Original Message-----
> > From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On
>Behalf Of doctorDHD@xxxx
> > Sent: Monday, July 04, 2005 5:36 AM
> > To: dmcnews@xxxxxxxxxxxxxxx
> > Subject: [DML] RPM Relay/ECM/Pulse generator Diagnostics
> >
> >
> >
> > Tom,
> >
> > What exactly are you trying to accomplish or find out?
> >
> > The "signal" going to the RPM relay is on the WS wire (white with
>a slate
> > stripe) and comes from the Ignition ECU to ignition coil  primary
>connection.
> > It is a "tach" signal and thus you should be able  to get a
>reading with a standard automotive diagnostic tachometer.
> >
> > If this info does not help, please give us more details about what
>you  need.
> >
> > D² & 6530
> > Currently undergoing a water pump change.
> >
> > Message:  6
> > Date: Sat, 2 Jul 2005  15:16:59 -0700
> > From: "Tom Tait"  <TTait@xxxx>
> > Subject: RPM Relay/ECM/Pulse generator  Diagnostics
> >
> > Is there a procedure available to test the signal going to  the
>RMP relay?  Can the relay itself be tested with a 12 VDC power supply or do 
>I need an alternating/pulsing current?
> >
> > Tom Tait  #10902
> >
> >
> >
> >
> > Thank  you,
> >
> > Dave
> >
> >
> >
> > "Just Say  NO, to the COUCH POTATO!"®
> >
> >
> > To see how go to _www.tvpedaler.com_ (http://www.tvpedaler.com/)
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> >
> >
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> >
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