Question about 1990 Mercedes-Benz 190
I'm always experiencing engine shutdown when running my mercedes benz 190e A/T. My 190E (1990) will usually start ok, but will start to run rough within 15 min or longer then stop. I checked the timing module output to the coil while this was happening with a timing light and a volt meter to the coil input to verify wether or not if it was the module or something else. The test did correspond to the engine rough idle (before it died), which makes me think that it is the timing module, but other inputs to the module, such as engine temp, crank position, etc. could be the be contributing to the problem and may not be the module itself. One thing that did happen before i started having these problems was that the alternator failed which may have electrically damaged some of the sensor inputs to the module. I hate to spend any money on a module when it could be a intermittent problem with a failing sensor. Any thoughts?
The electrics in the Mercedes are notoriously flaky. A failing alternator would cause a low voltage condition that would cause the battery to run down but would not likely damage any of the computer modules. Have you REPLACED the fuses that protect the various fuel and ignition modules? Not just visually inspected, but REPLACED them? When I ran my Mercedes 123 series cars, I replaced all the fuses on Day One, regardless of how good they looked. Bosch fuses are known to corrode and cause intermittent problems similar to yours. If a fuse is overheating or the contacts are not good, a few minutes of driving could cause a problem that imitates expensive module failure. It happened with my Mercedes and my Volvos that used Bosch fuses.
Posted on Jan 15, 2009
If you have a skinny or normal arm like myself, reach under the intake manifold and ckeck the ~~3/4 inch rubber hose which connects the air/idle controll module. If that connnection is off ( you can't see it but can feel it) the engine will not run. Period. If is loose or cracked it would probobly synthysize the symptoms of which you speak. All of the associated vacuum hoses cost about 35.00 total, and while your have the idle air valve off you can check and clean the "internal solenoid gate valve.
It took me 2+ weeks of checking everything to hell and back plus throwing un-needed parts at the engine - all to no avail.
As soon as I plugged in the rotten ~~3/4 hose the engine ran fine.
Good luck, Leon
Posted on Mar 07, 2009
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