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'86 240DL loss of power and gas mileage 200 1986

posted by  unggthat on  Tue Feb 6 01:40 CST 2007
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last visit: Thu Mar 6 10:37 CST 2014
[RELATED]

I'm currently trying to figure out the cause of my poor gas mileage (around 21mpg/ 9km per liter) and lame power. It's a 1986 240DL sedan. Plugs, cat, air filter are all new. It's been headed this way for a while.

Here are the symptoms: it always starts, albeit hesitantly in the super cold winter. When the engine is cold, the car really lacks power and the power pulsates a lot on acceleration. Once warmed up, it runs better, but still pulsates a bit while going up steep hills, and sometimes hesitates when floored. I was reminded of how down on power it is when I drove my 242GT that my wife usually drives. It felt like a rocket compared to the '86, which shouldn't be (minus the better final drive ratio).

Final thing: when I changed the plugs a couple months back, #2 was white. The other plugs were all the usual light brown. Am I having cylinder misfire? Head gasket? I don't want to just tear the head off in the turbo cold we're having in Ontario right now. Any guesses?

As always, thanks,

Nate Gundy





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