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Testing the Coil 900 1991

uid 18083's pic
posted by  lucid on  Mon Mar 14 08:55 CST 2011
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

"I will be looking at the coil this afternoon. What's the best way to test it?"

• Use a 12V test light on the Blue wire terminal, with the Key On. Use a meter if you don't have a test light.

If there is 12V at the blue wire, test for it at the Red-White wire too. With the Ignition CU and amplifier inactive, it should read thru the primary coil.

If no 12V at the Blue wire, suspect the RSR. It may be new, but failing due to a bad ground connection (happened to me). The pic below shows the ground tabs look like on a non-turbo, behind the right headlight. Yours will be on the left side.

If it was mine, I would unplug the RSR wires (Key OFF) and install a temporary jumper wire to connect the 2 thicker Red and Green wires. Then see if it starts (or at least tries). On a turbo car, the RSR controls both coil voltage AND injector voltage.

Remove ground tab to clean body metal contact area too (10mm hex bolt)


--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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