W212, M274 engine, E-Class 2013 petrol, Misfire P008992, P030085, P030185, P030385, P030485, P06DA00

[cheapshots]

Hi folks,

Having some real trouble here, E-Class 2013, petrol, M274 engine, 85k mileage, regularly serviced / looked after. Mostly used in town driving.

History:
3 weeks, as I was parking, the engine bay started to shake/jerk as if it was going to stall. Left it, came back 7 hours later, coolant low warning sign came up, I topped up and drove - was absolutely fine.
1 week ago, driving on dual carriageway, as I slowed down for a traffic light, the car started to shake/jerk violently again and then total loss of power, it just stopped.

AA to the rescue!

P008992 - fuel pressure control valve 1
P030085 - misfires different cylinders
P030185 - cylinder 1 misfiring
P030385 - cylinder 3 misfiring
P030485 cylinder 4 misfiring
P06DA00 - engine oil pimp bypass solenoid valve

The garage have checked: the coils/sensor on the fuel rail/spark plugs/expanded timing chain/compression test to check for cracked piston head and found a faulty injector spraying too much fuel into the engine which they changed.

However the problem persists and now the car won't even start. They're getting the ECU checked...

Wondered if something similar has happened to anybody here before. Thanks a million.

 

[optimusprime]

Yes sounds like the ECU is at fault . Quick fix if it is, but expensive

 

[ALFAitalia]

I'm always concerned when people/fitters say its the ECU with no real evidence.....because in my experience it so rarely is (unless water has got into it). Far more like to be sensors and/or their damaged wiring feeding the ECU duff info than the ECU itself......but I'd never say never!!

 

[cheapshots]

Update for you folks...

2 weeks at the local garage and the car is now fine. The garage changed injectors 2 and 3, and coils. £640 all in.

The fault codes kept throwing the garage off and I think they wasted a lot of time trying to pin point which injectors / coils were at fault.

I did query whether we should just change all injectors seeing as two out of four have failed... Any thoughts?

 

[Smiley]

I'd be surprised if there were two faults at the same time; and having two injectors fail at exactly the same time is doubtful. The fault is more likely to have been either the coil or the injector(s). At 85k my money would be on a coil gone down - and that is why the car did not start after they changed the "faulty" injector. On that basis the replaced injectors were not needed and I would not bother changing the other two. I'd also be finding a decent independent specialist to look after the car - it will save you money in the long run.

 

[cheapshots]

I'd be surprised if there were two faults at the same time; and having two injectors fail at exactly the same time is doubtful. The fault is more likely to have been either the coil or the injector(s). At 85k my money would be on a coil gone down - and that is why the car did not start after they changed the "faulty" injector. On that basis the replaced injectors were not needed and I would not bother changing the other two. I'd also be finding a decent independent specialist to look after the car - it will save you money in the long run.

Hi Smiley, hmmm makes sense what you're saying. As nice as my local garage are, yes I think I should have gone to a independent specialist for more complex issues.

Well here's hoping there are no other issues coming up (worried about the CAT) !