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Old 07-10-2003, 09:47 AM
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need help with sluggish 420SEL

I have a 1987 420SEL, 83K, that is idleing rough and stuttering/stalling on accel from a stop. Fuel pressure is a steady 90 psi. Compression is good. I have replaced distcap/rotor/wires and plugs, but no improvement. Once it gets going, it's perfect. Any hints or ideas would be appreciated.
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Old 07-10-2003, 11:35 AM
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Join Date: May 2003
Location: Rockville, MD
Posts: 96
Since you're asking for any help... I have an 87 420 also with 107K. Had symptoms you describe that started without warning or reason. Felt like it was missing a beat at idle (very rough for about a second every five seconds, oil pressure dip, RPM dip) and sputtered on takeoff like an old Peugeot. Threw a bottle of Techron in the tank and took it out on the highway and did some hard acceleration. Also put it in park and reved it into the 4-5K range for a bit. Took care of the problem straighaway. Not sure if I had a fuel line/filter/injector prob or if just running it out took care of it. Not too scientific but worth a shot?

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Old 07-10-2003, 11:44 AM
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Thanks, I'll give it a try.
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