Mercedes M103 engine misfire, Megasquirt MS3x conversion (EFI)

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Slight stumble / misfire on my Megasquirt ms3x install on my Mercedes Benz W124 with 3.0 M103 engine. I replaced all parts, 2 sets of injectors, switched from r8 coils red top COP to wasted spark VAG coilpack, checked all wiring, re-did my grounding the proper way, checked and confirmed timing by timing light, use signal filtering on the VR crank sensor and proper 0.6 - 0.7mm sensor gap at the 60-2 wheel. Car runs great otherwise, but has this intermittent but under all situations present slight misfire. You can hear this, and see the engine shake / shudder a little. Under load it seems fine; under steady 2 - 3k rpm in neutral it is more audible and worse. Revving out is fine. Compression is all perfect! Plug wires are all roughly same resistance and not shorting, tried 3 sets of plugs.
M103.983 3.0L i6 petrol N/A Bosch KE Jetronic 1987 Cat 178hp automatic straight 6
Mercedes w124 s124 c124 v124 a124 200e 220e 230e 260e 280e 300e 320e 400e e420 500e e500 124.030 124.032 124.036 straight 6 6-cyl sound mercedes-benz mercedes benz e-class e class e-klasse m103 m103 3.0 m103.983 722.3 automatic transmission german 1987 sedan saloon mopf0 rare #shorts #short #mercedes #benz #flames #decat #backfire decat backfire backfires flammen vlammen vuur shots AMG #AMG #megasquirt

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2 май 2023

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Комментарии : 8

@csBeO Год назад

Amazing build. You should do series of EFI conversion. As a 30+ years old engine it sounds pretty nice. I would check vacuum leaks in your case.

@BaasYT Год назад

Thank you! I’ve got it running better, and it’s on the road again :) I have thought about making some video’s about it, this is the second ECU and I’ve changed almost everything again (trigger, injectors, batch to sequential, wiring loom etc etc) so I know a thing or two now.

@marcusfrostenson9959 Год назад

So Im not an expert but i have the same setup ms3x 2.6. From my experience, m103 timing chains stretch alot so make sure you have a new one. There is a fair amount of valve overlap so it might help to delay injector timing. The o2 values at low rpm need to be fairly rich and the spark plugs may not like that. I assume your using the oem idle air control passages for the iacv, those can be really picky and you may want to just get a different iacv, e46 bmw valve is a 3 wire and i had much better luck controlling it.

@BaasYT Год назад

Thank you very much! I am aware of the chain issue, mine is a 1987 engine so without the dual row chain too. I calculated my injector timing to be finished 10 degrees before the intake valve opening up at idle, increasingly earlier up until 3500rpm where it has no real effect anymore. I will try doing this a little more later, I did not take in account any intake timing drift. How does overlap affect the injector timing? I thought it was better to have the fuel spray against the closed valve just when it is about to open, or earlier so it sits there for a brief moment. Injecting fuel with open or opening valve means difficult tuning, correct?

@juanjosehernandez9852 Год назад

What ckp wheel did you use and how did you install it?

@BaasYT Год назад

It's a 60-2 wheel, in place of the harmonic balancer. It was part of the K-jet killers kit.

@ShepardCommanderMF2 Год назад

Fajnie zrobione. Udało ci się ogarnąć już zapłon i będziesz zostawiał go na tej cewce? Zastanawiam się co wsadzić do swojego M103 2.6, bo czerwone cewkofajki VAG szybko padają od ciepła nawet przy zabandażowanych kolektorach. Myślałem o coil packu z Chryslera (56032520), jakbyś mógł się podzielić namiarem na twoją cewkę to byłbym wdzięczny :)

@BaasYT Год назад

Dziękuję bardzo! Miałem również czerwone cewki Audi r8 i nigdy nie miałem z nimi problemów, ale chciałem tę opcję, ponieważ czułem, że mogą wkrótce powodować problemy. To jest coilpack VAG VR6 z lat 90-tych, ale odradzam go, ponieważ zaciski są bardzo trudne do zdobycia, są to złącza niegwintowane 4 mm zamiast normalnych złączy SAE około 8 mm. Po miesiącu w końcu znalazłem dobry typ końcówek kablowych, więc mogę robić nowe kable. Zamiast tego możesz użyć coilpacka Opla V6 z lat 90., takiego jak Opel Omega. Ma normalne złącza typu SAE, jak sądzę.