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  #1  
Old 05-12-2000, 05:42 AM
kevinjh
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Hi Folks,

I've got a 5 spd 280sl in great shape. Only problem is the occasional stumble when under acceleration. It feels as though there's a sudden loss of power after I step on the gas. When this occurs I would ease off the gas and then step on it again and then it takes off fine. This normally happens on the lower gears. Any suggestions on what I can do?

BTW. This happened even after I changed the Spark Plugs, Oil, Belts, Gear Oil and all the rest.

Thanks,

Kevin

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  #2  
Old 05-12-2000, 08:57 AM
Jim Villers's Avatar
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Location: Virginia Beach, VA
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A question and a thought .. does it only happen at low RPM's? Thoughts .. the fuel injection system should rule out a fuel problem and that leaves ignition. My 230SL had a faulty vacuum advance that caused a feeling that it just "wasn't running right". When setting the timming with a timming light, the advance moved around with increasing RMP's vice a smooth advance. With the cost of the vacuum unit at $75, I bought a rebuilt distributer for $125. It did wonders. I found the source in Hemmings and will pass it on if you desire.

The 5-speed is perfect for this car. I drive mine every day.

Jim Villers
190SL, 230SL 5-speed
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Old 05-14-2000, 10:18 PM
kevinjh
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Hi Jim,

It occurs at the low to slightly below the mid-range level. I had initially thought it was due to the fuel so I used higher fuel with a higher octane rating but that did not seem to help. What other components of the ignition do you think could cause this? Can you pass me any info you have on this?

How's the Air Conditioner you installed?

Thanks,

Kevin
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Old 05-15-2000, 01:01 PM
Jim Villers's Avatar
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Join Date: Jan 2000
Location: Virginia Beach, VA
Posts: 490
Kevin ... I am still mulling the A/C system. I have heard only "cons" on it. The issue seems to be the power and torque of the engine and whether I want to put up with the power transfered to the A/C unit.

On your problem. I again doubt that it is fuel. You can easily test this hypothis by richening your fuel mixture by taking about two twists to lengthen the control rod to your injector pump. If this changes the sympthoms, then go the the manual and reset your linkages, a four or five step process.

My thoughts still revolve around an incorrect spark advance. To test this hypothis, advance your timming about 5/10 degrees and take it for a test drive. If this "fixes" the midrange problem, then set the timmng at 3000 RPM whith the vacuum advance disconnected and pluged, it should be 30 degrees BDC (I think, check the manual). Then check the advance curve with the one in the manual. Finally, reconnect the vacuum advance and adjust the idle.

Setting the timming at 3000 RPM removes centrifugal advance at low RPM problems. Also many people forget to remove and plug the vacuum advance which effects idle speed and advance.

When it is correct, it should run like a dream.

jim Villers
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Old 05-15-2000, 10:52 PM
kevinjh
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Thanks Jim,

I'll try this out over the weekend.

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