engine shake/oil on spark plug-190 - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 01-14-2007, 12:21 PM Thread Starter
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Question engine shake/oil on spark plug-190

Hi all, thanks for reading, & I'll state right off I'm not the most "mechanically knowledgeable" person . I have a question & am seeking advice both for a solution & to get an idea if the guy I took my car to is "on the up and up." A few days ago, my 1987 190E 2.3's engine started to shake severely. (is at worst when driving at low speeds or idling) Other "symptons" also include a significant loss of power (barely makes it up steep hills) and sluggish acceleration in general. Thinking it might have to do with the spark plugs, I took it to the place where I had them changed a few months back. They inspected the plugs, discovering oil on one of them. He then told me that as a result, I was only running on only 3 cylinders and basically had 3 options; replace the engine, rebuild the engine, or he could do some kind of temporary fix he called "an extension" (for the cylinder that leaked oil onto the plug). Has anyone had any of these problems &/or have an opinion about the diagnosis I was given? Thanks in advance for any replies!
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post #2 of 4 (permalink) Old 01-15-2007, 05:01 PM
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Hi, Dmfb and welcome to the forum.

The first question I'd have for your mechanic is "Did you perform a compression test on the engine?"

If his answer is no, I'd find a new mechanic, period.

If he did one, ask him what he found and how he performed the test. Typically when you find a low cylinder you also squirt some oil into the cylinder to see if that restores a good part of the compression. If so, it's probably rings, if not, probably valves. If the latter, a valve job -- much less expensive than a rebuild -- would typically restore the car's performance.

You don't mention mileage or how well maintained your car has been, but if it's up in miles or hasn't been well maintained then I'd not be surprised if you have some significant wear; typically you'd see it throughout the engine, though, and not just confined to one cylinder when it's truly a wear condition.

At the least I'd put in a new spark plug (one range hotter for the time being, it will help burn the oil off the plug) and take it for a second or third opinion.

Post back up when you know more...

Good luck!

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #3 of 4 (permalink) Old 01-24-2007, 02:55 PM Thread Starter
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ok... so I went to another shop, the guy did the compression check, which was fine. He then changed the spark plug wire to the cylinder that was missing, which apparently wasn't conducting the spark. (which also in turn provided for the oil on the plug since the cylinder wasn't operating properly) This helped the shaking, but the power (lack of) issue was still there. He then loosened & tapped on the gas lines, which low & behold took care of the rest, & now I'm back in business. Hopefully this can provide insight to anyone who might need it, & might some day help someone else as much as many of the responses helped me. Thanks again!
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post #4 of 4 (permalink) Old 01-24-2007, 03:42 PM
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Your experience reminds me that many of the scary appearing issues I have experienced often have simple and most of the time inexpensive solutions. Please hold onto this mechanic!

'87 300E: sold after 11years @ 230k & still on the road somewhere in rural Tennessee.

'94 C220 with 93k totalled 10/06 by hit & run broadsiding monster truck: not a scratch or bruise for me
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