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  #1  
Old 08-31-2022, 02:49 PM
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Feels like a kick in the gut on my 280SE 4.5

My 280SE 4.5 wouldn't start so I replaced the distributor cap/rotor and it started right up, but after driving a while it started to feel like is was starving for gas and began running rough. I replaced the fuel filter, spark plugs and wires and still get the same roughness with what feels like the engine being kicked, or punched hard every now and then. Could it be bad injectors with a cylinder and the piston kicking back? Anyone have this experience with what might be causing the 'kick' feeling? Thanks.

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Old 08-31-2022, 03:52 PM
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The trigger points are always suspect as well as the original points/electronic switchgear. I cleaned my trigger points and installed a Pertronix and coil and it cured my drivability issues.
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W111 280SE 3.5 Coupe
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  #3  
Old 08-31-2022, 07:23 PM
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Quote:
Originally Posted by Tony H View Post
The trigger points are always suspect as well as the original points/electronic switchgear. I cleaned my trigger points and installed a Pertronix and coil and it cured my drivability issues.
Thanks, I'll try that next. Would the misfiring cause the kick or bang sensation I'm feeling from the motor?
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  #4  
Old 09-01-2022, 01:03 PM
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I had the electronic switchgear go bad in my 280SEL 4.5 years ago. It started as a slight backfire going down hill on lift throttle. It turned into a bucking bronco of misfire and lack of power. It ended with a totally dead ignition one morning. I went the Pertonix route for several years before I broke down and did fuel/spark Megasquirt.
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  #5  
Old 09-03-2022, 08:27 AM
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Thanks for the info, but what's the electronic switchgear?

Quote:
Originally Posted by TZ_280SEL View Post
I had the electronic switchgear go bad in my 280SEL 4.5 years ago. It started as a slight backfire going down hill on lift throttle. It turned into a bucking bronco of misfire and lack of power. It ended with a totally dead ignition one morning. I went the Pertonix route for several years before I broke down and did fuel/spark Megasquirt.
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Old 09-04-2022, 09:29 AM
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Mercedes put an electronic box between the points and the coil. It takes a lot of the load off the points and prevents having to adjust them. BUT, as the electronics start to fail, you get erratic ignition followed by no ignition when the box finally fails.
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  #7  
Old 09-04-2022, 01:14 PM
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Ahh.. thanks.

Can anyone post an image of the correct firing order on the 4.5... I seem to find conflicting images. (See attached)

Thanks,
Mark
Quote:
Originally Posted by TZ_280SEL View Post
Mercedes put an electronic box between the points and the coil. It takes a lot of the load off the points and prevents having to adjust them. BUT, as the electronics start to fail, you get erratic ignition followed by no ignition when the box finally fails.
Attached Thumbnails
Feels like a kick in the gut on my 280SE 4.5-firing.gif  
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  #8  
Old 09-04-2022, 04:38 PM
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if you haven't done so yet, remove the battery and look under the tray. There's a bolt that grounds a lot of EFI wires. Undo the bolt, clean up the corrosion and put it all back together.

Is it going to fix your problem? Maybe not. Will your EFI system work better? Probably yes.

-CTH
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  #9  
Old 09-04-2022, 05:31 PM
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Firing order should be cast into the intake manifold or valve cover as "Zundfolge".

Good luck!!!
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  #10  
Old 09-12-2022, 05:26 AM
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Ur problem is possibily a fuel vapor lock. Cuz my 108 did the same rhing. Hard to start when off the highway. U can replace ur radiator, there is a radiator for sale on ebay, which is a aluminum one with 2 or 3 role, that is an exact fit and it boosted my cooling. My car used to have vapor lock in NY ,Now im in TX and never ever have the same problem.
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  #11  
Old 10-04-2022, 07:28 PM
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Thanks for all the input on this. I haven't had much time to tool around but did swap to wires on the firing order and that got rid of the occasional engine 'bang', but the motor still seems to run a bit rough. I purchased the Petronix conversion kit for the points and condenser, so that will be my next step. I noticed there's a fuzzy brush that hits the alternator shaft. Should that be bent away for the pertronix magnet to slip down to the alternator plate?
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  #12  
Old 10-05-2022, 11:03 PM
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Im guessing when you say alternator you mean distributor.
The points set in the disti has a rubbing block the the lobes hit to open the points. You remove the points completely to put the petronix unit in.

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