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Fuelly
Fuelly
Fuelly
Fuelly
Fuelly
Fuelly
Fuelly

M129 rough running

Over the last couple of months I’ve had issues with the M129 rough running in my 250SE. The car was hesitating, idling poorly and just not running very well. I’ve done a few things over the last few months to improve this situation.

One of the first things I did was change the injectors. The stutter when accelerating and hard starting when hot felt like a symptom of poor injectors. I also didn’t want the situation of a leaky injector washing down my cylinder walls. While not as cheap as the K Jet injectors, the MFI injectors are still available […]

November 6th, 2020 | Tags: , , , | Category: Mercedes | Leave a comment

M103 Distributor cap and rotor

Today I changed the Distributor cap and rotor in my 1986 300SE. I bought the new cap and rotor about two years ago but only just got around to changing it. Unlike on the earlier engines, the M103 distributor cap is a fiddly job. Instead of sticking upwards, it comes out sideways as it attaches to the camshaft.

I find that whenever I buy one of these older cars, chances are the distributor cap needs changing. It is not generally an expensive part on the mainstream engines, and can make a big difference to the smooth and reliable running of […]

December 18th, 2019 | Tags: , , | Category: Mercedes | Leave a comment

The 560SEC has stopped smoking

My 560SEC had a problem where it would emit a puff of smoke after idling. This was rather embarrassing taking off from the lights. It did give me the advantage of keeping people back who got too close. My assumption was that it was cause by old valve stem seals. As the seals get old, they get hard and allow a small amount of oil to seep through into the combustion chamber when the car is at idle.

When the car is idling, the throttle is mostly closed resulting in high vacuum. The high vacuum causes oil in the heads […]

March 3rd, 2019 | Tags: , , , | Category: Mercedes | 2 comments

New coil, cap and rotor bring the SLC back to life

As outlined in a previous post, the 450SLC broke down a week and a half ago and the NRMA helped me diagnose it down to a bad coil. Yesterday, my new coil, cap and rotor arrived so I got down to getting fitting them t the car.

A quick test of the new coil had the car roaring back to life, so I swapped the new coil in properly. This job can be done with the tools found in the Mercedes tool roll (screwdriver, 8mm and 10mm spanner), which helped as the car was not near my tools.

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November 7th, 2013 | Tags: , , , , | Category: Mercedes | One comment