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#1
01-25-2024, 08:08 PM
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ABS Light/Rough Idle Quirk
On my 91 every now and again, when I start the car, the ABS light will come on and the idle will be rough. Then after a few seconds the light goes out and the idle is immediately smooth. Just a minor quirk...any ideas what's going on?
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 75k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
01-25-2024, 08:15 PM
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Might be voltage regulator and/or brushes on their way out.
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"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#3
01-25-2024, 08:18 PM
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Alternator replaced 70k miles ago.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 75k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#4
02-03-2024, 12:44 AM
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It is the overvoltage protection relay behind the battery. Will have a red top with a fuse.
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#6
02-03-2024, 08:52 AM
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I would also suspect the OVP.
If you have a soldering iron, try reflowing the main pins contacts to the OVP board and see if that cures it. Lots of write ups on how to do this and fairly easy.
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#7
02-27-2024, 04:09 PM
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Believe it or not, I had several of these lying around in my random parts bin! So swapped it out.
Interestingly, the old part number 201-540-32-45 is no where in the MB parts system. The guy at the MB parts counter was telling me it's not an MB part...when I was holding it in my hand! Anyway, hopefully that does the trick. Thank you all for pointing me in the right direction.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 75k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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