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Old 11-12-2009, 02:42 PM
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Join Date: Mar 2003
Location: Carmel, CA
Posts: 301
Unhappy 1989 560SEL - Engine issue

Okay so here is my issue....

My 1989 560SEL with 162,000 on the clock has all of a sudden decided to start running on less than the 8 cylinders is has. I replaced 2 plugs that appeared to be badly fouled. All the others are fine. Over the past year he (yes, my 560's name is Hans) been running a little rough when cold then fine when fully warm.

In the past 2 months its as if the car is doing something worse than just rough idling. It's like the engine like wants to die, or being starved of fuel, or something. When he's fully warm its like the engine jerks and has now a cylinder or two not firing, even at highway speeds.

Am I having a fuel flow problem? Injection issue? Any or all thoughts or questoins are welcome.


1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500
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Old 11-13-2009, 01:14 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Do the cap, rotor & wires check out Good?
Have you checked compression?
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Old 11-14-2009, 12:41 AM
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Join Date: Jul 2008
Posts: 1,236
So many possible reasons......

Start off looking for vacuum leaks. Check injector O-rings and cups. Check the air distro hoses. Check the air intake plenum, and the ring seals underneath all that intake stuff.

Check your cap, rotor, and wires (actually might wanna do that first). Make sure that the injectors for those cylinders are working. You may have a dying fuel distributor (god forbid).

Lots and lots of possibilities. Start off with the easy to check/cheap to replace items.


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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