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1991 240 Sedan, Blue, no ABS, 320K, daughter's car for past 11 years.
I agreed to have a look over lunch hour. Found it cranks strong but not a hint of fire.
Left the key on, popped the hood, and checked the OBD. Had a 232 on fuel side, 111 on ignition.
Took out a test light, rolled back the AMM boot, and saw good battery on the orange lead. Checked at the coil, also good battery.
Got out the remote start switch (jumper between test socket and battery positive) and cranked with test light connected across coil (term 1 to 15) and the light remained dark, telling me the coil was not getting charged. Steady battery seen at the white/red (coil#1) terminal.
Double checked by unplugging the coil wire, then connecting a jumper lead from ground to a scratch awl with a rubber handle held near the open coil high tension terminal to verify there is no spark. Plugged the coil wire back in.
Suspect CPS. Gave its lead a shake and repeated cranking. Still nothing.
Got out the DMM. Checked resistance of CPS at its plug. 160 ohms.
Got out T25 screwdriver to remove EZK power stage. Cold fingers not enough. Needed to put T25 bit on 1/4" ratchet to withdraw badly corroded self tappers from fender. With power stage connector boot rolled back, I see 300mV DC on input gray lead referred to the battery post. Cranking causes the display to bounce around 1 to 2V or if AC measured, about 1 VAC on my cheap permanently autoranging Walmart DMM. Meter or test light still shows battery (through coil) at the white/red lead out of the power stage.
Got out 8mm nutdriver to remove power stage from 89 wagon (my ride there) and again, the cold fingers wouldn't cut it without going for a ratchet. Kinda awkward in front of the battery with little room for hands. Swapped in the ignition amplifier from the wagon and now my daughter has a dead wagon in her driveway, but a running 244.
After work tonight, I'll return with a spare power stage for the wagon.
--
Art Benstein near Baltimore
Some days you're the bug; some days you're the windshield.
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