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Old 06-24-2002, 01:45 PM
jeff (moose)'s Avatar
junior member by default
Join Date: Mar 1999
Location: Grandview, MO USA
Posts: 121
Angry dead miss

I have a 92 500E that was running fine. I started to work on the list for the 60K service. I swapped air filters and caps and rotors with bosch replacements and have confirmed that parts were correct. Upon installing new parts the car has started missing, first just a hesitation on decell and accel, then acting like it has 4 cly hitting instead of 8. I put the old rotors back in the car and it was better but still died at stops and was hard to restart. I have ohmed the wires, cap, and coil wires. One of the coil wires does not want to click in to coil, the contacts at the coil were spread slightly but should still make a good contact. I pulled and am replacing plugs and am going to fire back up. I have seen no check engine light but the car is puffing gas fumes ( as I am concedering hemlock for cocktails tonight).
I am a fair tech and a good parts swapper, and even though after years in the industry, all I have is a volt ohm meter for diagnostics, no repair manual for this car as of yet

ideas ???

I will repost after installing the new plugs ( all 8 look the same, slightly fuel fouled) and installing the new caps and rortors and redriving.


(seeking good recipe for a hemlock martini)
Jeff (moose)

92 500E 90K miles stock less AMG chip

73 Datsun 240Z, 74 260Z, and a 75 280Z 2+2
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Old 06-25-2002, 11:21 AM
jeff (moose)'s Avatar
junior member by default
Join Date: Mar 1999
Location: Grandview, MO USA
Posts: 121
Angry dead miss

To follow up, I installed a new set of Bosch plugs and reinstalled the OE rotors and the problem is so bad that the car will not stay running. There are no codes stored and no check engine light coming on. I am going to install 2 new MB rotors today and see what happens.
I could sure use some help trying to figure this out. I had a Corvette that the dealer couldn't fix that was doing something simular. I was able to find an idle air control that was bad that would never set a code but this is driving me nuts.


still needing pain relief
Jeff (moose)

92 500E 90K miles stock less AMG chip

73 Datsun 240Z, 74 260Z, and a 75 280Z 2+2
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Old 06-25-2002, 01:05 PM
Registered User
Join Date: Jan 2002
Location: England
Posts: 1,841
U didn't use platinum plugs? For some reason most of the MB's (at least on this board!) seem to hate them and miss etc.
Anyone know why this is?

2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
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Old 06-25-2002, 01:30 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
Don't want to insult you, but are you sure you got the plug wires back on the caps in the correct positions and orders? And have you checked to see if you knocked a wire loose somewhere in that tender wiring harness?
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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Old 06-25-2002, 01:58 PM
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
FWIW, do you know if the engine wiring harness has ever been replaced?

These cars have had trouble with engine wiring harnesses, and when you move the wires around, sometimes it causes shorts in the harness. If you can look at the insulation, if you see it flaking off, or if the insulation has turned powdery or is crumbling, or if it looks like its 2,000 years old, then I think you're going to have to replace it.

Also, it's not usually the spark plug wires that go bad, but the resistor ends. Do you have the resistor ends properly attached to the wires?

Just a thought.

Oh, almost forgot. Have you tried posting in the Hot Rods forum here? That is where most of the 500E owners hang out, and you'll find pages and pages of tech stuff in this section.
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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