Guys, Let me help you out with testing of this switch. It is a switch, so you will only see two states - shorted (about 0 ohms) or open (infinite). There should be no resistance in this circuit... well, maybe 1 or 2 ohms for the wiring. If you see more then it's time to clean the connections. According to the shop manual (page D:04:10 and D:04:11) the switch will activate when the temperature is BELOW 15 degrees C or 59 degrees F. This means that below this temperature it should be shorted (single ohms, beep on continuity test) and above this temperature it should read open circuit. I hope this helps Tom Niemczewski vin 6149 (in Poland!) Google earth: 52°25'17.30"N 21° 1'58.00"E dmctom@xxxxxxxxx www.deloreana.com ----- Original Message ----- From: "John Hervey" <john@xxxxxxxxxxxxxxxx> To: <dmcnews@xxxxxxxxxxxxxxx> Sent: Sunday, May 18, 2008 5:39 PM Subject: RE: [DML] Testing Lambda thermal switch > Paul, I laid 3 lambda sensor on my bench and used a multimeter with a > buzzer > continuity tester and the show open on all 3 and on resistance nothing > either. I haven't had time to put them in hot water. > John Hervey > www.specialtauto.com > > > -----Original Message----- > From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf > Of > sweetp01569 > Sent: Thursday, May 15, 2008 2:50 PM > To: dmcnews@xxxxxxxxxxxxxxx > Subject: [DML] Testing Lambda thermal switch > > Using the MYDELOREAN.NET How-to guide #19, I get an open circuit > between pin 7 and chassis ground for the test in step 3 with the > engine cold, which indicates a failed switch or wiring. I get open > circuit when the engine is warmed up, which is supposedly correct. How > else can I test the thermal switch without removing the intake > manifold and entering "the valley". I don't believe I have any weird > idling symptoms, except for a little hesitation (like it wants to skip > cylinders) when I press the gas when the engine is cold. Is this a > possible symtom of a bad thermal switch? > > Thanks, > > Paul > > > ------------------------------------ > > 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/dmcnewsYahoo! 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/dmcnewsYahoo! 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/dmcnewsYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> 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/