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Garage => Mechanicals => Topic started by: KASTE on 15 March 2023, 09:42 AM

Title: 280 SE problem ignition
Post by: KASTE on 15 March 2023, 09:42 AM
Good morning everyone
I have seen all the posts but I have not found anyone who has had the same problem as me or the same symptoms or maybe I may have missed it and I apologize.
I have a 280se from 1978 and it has the following problems. I try to be as concise as possible:
I turn on the cold car, it starts immediately, it accelerates and decelerates by itself for 1 minute, as soon as it warms up it goes to the right idle, at 80 degrees I set off and after 4\5 km or 5 minutes on the road when I accelerate the car has gaps and it starts to run on 5 cylinders\4 cylinders, I stop, turn off the car and immediately turn it on again and everything works perfectly again but after another 4\5 km or 5 minutes it starts again with this problem.
if I leave the hot car turned off for more than 20 minutes (still a little hot) after that it doesn't restart immediately and the motor turns many times before it turns on again from hot.
I leave it at 80 degrees and a constant oil pressure of 2.5 bar after 10 minutes cylinder 6 no longer works and then 5, 4 and 3 until the engine stays on with only 2 cylinders and then shuts down completely .
I beg you, help me understand what the problem could be because when the car is fine, everything runs like a god without problems but when he plays that joke on me, I can't drive it anymore, risking accidents.
thanks to all and to whoever can help me

Lorenzo

VISTA MOTORE (2) - Copia.jpeg

VISTA 3-4 ANTERIORE.jpeg

VISTA 3-4 POSTERIORE.jpeg
Title: Re: 280 SE problem ignition
Post by: Nabstud on 15 March 2023, 10:41 AM
Could be a blockage in the fuel system? When the car is stopped the dirt/blockage drops to the bottom of the tank, the when driving it clogs the fuel line again???
Title: Re: 280 SE problem ignition
Post by: KASTE on 15 March 2023, 10:44 AM
è rimasta ferma per 2 anni ma quando l'ho comprata e ho fatto 200km per portarla a casa non mi ha dato problemi, dopo con il tempo ha cominciato a fare questo scherzo fin che ora è diventato insopportabile
Title: Re: 280 SE problem ignition
Post by: rumb on 15 March 2023, 12:10 PM
My first thought is plugged fuel filter. There is one in bottom of gas tank and the other by the fuel pump.

The surging during warm up could be the WUR.
Title: Re: 280 SE problem ignition
Post by: KASTE on 15 March 2023, 02:38 PM
ok grazie ho preso la pompa nuova per sicurezza ma il wur dove si trova di preciso?
Title: Re: 280 SE problem ignition
Post by: BCK1963 on 15 March 2023, 03:42 PM
Ciao Lorenzo,

qui si parla inglese. Alcuni di noi forse possono parlare e capire italiano, ma lo majorità no  ;)

    Saluti    Bernd
Title: Re: 280 SE problem ignition
Post by: KASTE on 16 March 2023, 04:26 AM
I'm sorry I copied the wrong translation believing that the pc had already translated my fault thanks for telling me
Title: Re: 280 SE problem ignition
Post by: Feather535 on 18 March 2023, 11:19 AM
I'll answer Lorenzo's question in English.  Unfortunately the WUR is located in a really terrible place on this car (ask me how I know).  It's on the side of the engine under the intake manifold.  If you don't have access to a lift, you can see it if you lie down under the car and look up behind the oil filter.  The WUR is the thing with 2 fuel lines, a vacuum hose and an electrical wire connected to it.

Title: Re: 280 SE problem ignition
Post by: KASTE on 11 April 2023, 01:35 PM
good morning everyone, I'm happy to tell you that the problem was the fuel pump that didn't work so well anymore, replaced, the machine is back to working perfectly!!!!