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With all these cars, no spark also equals no fuel- the computer must get a pulsed signal to turn on the fuel pumps.
For a turbo up to 89, this comes from the hall sensor in the distributor. This does go bad and causes no-start situations. Wiggling the connector at the bottom of the dist may cause the problem, or make it go away. We replaced the dist in our 88 740GLE 2 years ago for this reason.
For a non-turbo 89-up, the same problem stems from the RPM sensor or crank sensor- it has several names depending on who you ask, but basically it looks at a sequence of holes on the outside of the flywheel, and gives the computer pulses that way. The sensor is surely due to be replaced if it's original, in a 1989 car.
There is a power stage mounted in the LF fender, that can go bad and cause no-spark situations. It's a known failure item.
As the FAQ's and many posts on here mention, the fuel pump relay and ignition suppression relay are also potential no-start problems.
Good luck!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 225K, 88 744GLE- 209K, 91 244 183K. Also responsible for the care and feeding of: 88 745GLE, 229K, 88 244GL, 146K, 87 244DL, 235K, 88 245DL, 236K
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