Good idea. I agree that this could be the problem. The easy way to check this is with a timing light. Then you don't have to mess around with the cap and wires...unless the timing light shows the rotor to be pointing in the wrong direction. -Joe Kuchan >From: "Bernie" <bmanderville@xxxxxxxxxxx> >Reply-To: dmcnews@xxxxxxxxxxxxxxx >To: dmcnews@xxxxxxxxxxxxxxx >Subject: Re: [DML] RPM Relay/ECM/Pulse generator Diagnostics >Date: Tue, 05 Jul 2005 22:21:34 -0000 > >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] > > > > > > > > > > > > To address comments privately to the moderating team, please >address: > > moderators@xxxx > > > > 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 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 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/