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Function of Radio Suppression relay? 700

posted by  lucid on  Mon Oct 31 00:35 CST 2005
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

"The primary ignition circuits can be eliminated as a culprit if you can see the tach moving slightly during no start cranking, this means ignition pulses are getting to the coil negative terminal. These pulses arrive there via the power stage and are also supplied to the tach."

Runwld doesn't give us the year of his car, but if it has the Regina FI as many/most of the late 80s and early 90s 700/900 cars do, this tip may not apply.

Seeing this tip often posted, I was curious about it and tried it on my '93 940 Regina car. I induced "no start cranking" by pulling the fuel relay. There was no flickering of the tach needle at all when I cranked it over.

AFAIK, pulling the Regina fuel relay should not affect the REX ignition, but would merely simulate an inoperative relay.

BTW (off-topic), I agree that cold starting and cold running are not the same. Some just want their misinformed opinions confirmed it seems.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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New Function of Radio Suppression relay? [700]
posted by  runwld2 subscriber  on Sun Oct 30 14:40 CST 2005 >


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