Thermo Time Switch, Purpose |
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Thermo Time Switch, Purpose |
2-OH! |
May 7 2007, 04:39 PM
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#1
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Senior Member Group: Members Posts: 552 Joined: 17-October 03 From: Santa Clarita, Kalifornication Member No.: 1,253 |
I have already sent this to Brad Anders, but I decided I would like your opinion as well...
Going thru hell with 1973 - 1.7 D-Jet running awful from 0 to 180 degrees (oil temp)...Bucks, snorts, spits, unstable RPM, all before 180...Runs OK (not great but OK), after 180... Newly rebuilt MPS (Bleyseng), switched ECU's with known good unit, no help... Newly purchased from Pelican, Head Temp Sensor shows 3.16 OHMS...Old HTS shows 3.65 OHMS... Currently re-sealing all intake runners, plenum, TB, etc. looking for vacuum leaks...While I had the Thermo-Time sensor off the block, I checked it with an OHM meter both hot and garage temp (approx. 75 degrees) and got no reading at all...Indicating to me that the unit is open... As I read the wirnig diagram, all the Thermo-Time switch does is complete the ground for the Cold Start valve and therefore would not effect starts in 70 degree weather... Is that your intrepretation of the Thermo Switch...If so, I can eliminate that as a possible source of my trouble... Thanks, 2-OH! |
Bartlett 914 |
May 8 2007, 07:55 AM
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#2
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Advanced Member Group: Members Posts: 2,216 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
Make sure you have the correct ECU and CHT. Ones from a 74 will not work correctly. You also need a ballast resistor in series with the CHT. I am not sure of the correct resistance for the CHT for a 73 when cold. I know the resistance in in K ohms (3K, 2.5K something like that). You can always place a pot in place of the CHT. I would use a 5K pot with a 270 ohm resistors in series. Use this to find out if the problem is with the CHT or if it is some other problem like the MPS.
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