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#1
11-04-2007, 11:18 AM
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1988 420sel misfiring
Hello everyone,
I have a 420sel that is missing and I can't seem to put my finger on it. I tried to search the archives and came up with nothing, so if this is a repost I apologize. What is happening: At low RPM the engine has a shudder at intervals. I've changed the spark plugs (used copper plugs) and it's still there. It is more pronounced when it is colder out, therefore I believe it's electrical. I was thinking perhaps the wires need changed? I'd like to check the resistance of the wires and the plug connectors, does anyone know what these should be? Anyway, the shudder comes and goes, and after driving at highway speeds the shudder isn't nearly as bad. Thanks in advance!
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1988 420sel 
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#2
11-04-2007, 11:49 AM
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Check all the components involved with the fuel delivery. Especially the fuel distributor and injectors.
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I got too many cars!! Insurance eats me alive. Dave 78 Corvette Stingray - 3k 82 242 Turbo Volvo - Manual - 270k 86 300e 5 speed manual - 210k 87 420sel - 240k 89 560sl - 78k 91 420sel - 205k 91 560sel - 85k 94 GMC Suburban - 90k 97 Harley Davidson Heritage Softail - 25k 00 GMC Silverado 1 ton 30k
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#4
11-04-2007, 12:27 PM
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I suspect you have a bad fuel distributor. The age of your vehicle is time for this item to fail. Unlikely that some "magic juice" of any type in the gas, oil or otherwise will solve the problem.
__________________
I got too many cars!! Insurance eats me alive. Dave 78 Corvette Stingray - 3k 82 242 Turbo Volvo - Manual - 270k 86 300e 5 speed manual - 210k 87 420sel - 240k 89 560sl - 78k 91 420sel - 205k 91 560sel - 85k 94 GMC Suburban - 90k 97 Harley Davidson Heritage Softail - 25k 00 GMC Silverado 1 ton 30k
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