Anonymous
Anonymous asked in Cars & TransportationCar MakesMercedes-Benz · 1 decade ago

I changed 3 glow plugs on my 1982 Benz 240D. If the 4th plug is bad, can the new 3 plugs still work?

My 82 Benz 240D it is hard to start in the morning. I did change 3 glow plugs, but can't reach one of them, so one plug is old. The dash light stopped working after I changed 3 plugs. Will the new plugs still work?

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  • vovo
    Lv 6
    1 decade ago
    Favorite Answer

    Do yourself a favor, replace the fourth one too~why take the chance and ruin ur engine??

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  • 1 decade ago

    In '82 the plugs transitions from serial to parallel. If the plugs are serial, then none of them will work if one of them is bad. If parallel, the three new plugs can work even if the fourth is bad. Here's how to tell:

    Serial: http://img.eautopartscatalog.com/live/F110062528BO...

    Parallel: http://img.eautopartscatalog.com/live/F1100117853B...

    If the dash light is now out, check your wiring again. The glow plug fuse is a strip of lead located in a plastic box on the firewall, almost directly behind the motor. It looks like this: http://img.eautopartscatalog.com/live/P201011768PU...

    If the car starts, it's good enough.

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  • 1 decade ago

    A bad glow plug won't ruin your engine. It will just mean that the engine won't start as easy and the rear cylinder will have to clear out the unburned diesel until it is hot enough to burn.

    But if the dash light is not working that could mean a problem with the system.

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  • 1 decade ago

    The dash light will burn anly if 2 or more glow plugs are defect. You'll need an specially bended tool to reach the fourth. Don't drive too long with only three glow plugs working.

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  • 1 decade ago

    Just change it. There's got to be some way to get to it. Don't be afraid of removing other parts that are in the way. When I can't figure out how to get to something on my car (1981 Oldsmobile) I step back for a moment, smoke a cigarette, and go look at it again and I always figure it out. A car is designed to be serviceable, Especially older Mercedes-Benz vehicles, their engine bays are extremely well designed.

    Do you have the service manual? If not definitely invest in one if you plan on keeping this car.

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  • Anonymous
    1 decade ago

    unless wired in series.check glow plug fuse strip fuse also.You can if good compression start without them.I test my sd all the time at below 40 degrees.

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  • Ralph
    Lv 5
    1 decade ago

    Yes on 3 cylinders, will run rough for a moment upon starting

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