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My 93 240 stalled out on a rainy night and would not re-start. After ruling out the usual suspects, I realized that the main relay which controls fuel injection apparatus was getting wet and had corrosion on the contacts.
I found the leak which was around where the wiper motor passes through the firewall. I cleaned the contacts up and could only get the car to run if I removed the distributor hold down insert and rotated the distributor clockwise. (The hold down insert is designed to prevent you from changing the distributor position, since the speed sensor and the flex plate are supposed to dymnamically adjust the timing.) I tried a new relay with the same results. Checked timing and the motor seems to be timed correctly, but will only run if I keep the distributor in the new position. The idle is a bit choppy and the engine misses upon acceleration.
Other info: I changed the timing belt about 6-8 weeks prior to this and think that it may have jumped. I did not change the tensioner, it seemed to be OK and doing its job. Could the tensioner be bad, or would the belt have jumped on its own? I'm convinced that the main relay contacts were causing the no start problem but cannot figure out why she is running poorly after I corrected the relay problem.
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Greg Caggia 1993 240 with B230F
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