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Discussion Starter #1
Hi all,

Last Saturday i picked up my E60 M5, 2007 LCI with 65k on the clock. On paper the car is perfect, had alot of common faults already fixed, and has had a warranty most of its life so it has wanted for nothing. The drive home was about an hour, however about half way home i eventually got the car on the motorway and let it wind on in 4th gear P500S to above 7k RPM. After returning to normality, about 20 - 30 seconds later the car went into limp mode with an engine fault. Very rough running, severe misfiring etc. Drove a few miles further to the next exit, pulled up the trafffic lights with a LOT of smoke and very strong smell of fuel. I pulled over and switched it off, went to restart it and it failed to start - after a few turns it simply locked (hydro locked im sure). Got the car trailered back to the warehouse where i work and plugged my code reader in. Many many cylinder misfire with cut-off codes, lambda reading codes, fuel pressure error. Oil cap stinks of fuel, car swallowed roughly a quarter of a tank in the few miles it was driven.

I contacted the dealer and eventually took the car back last night to his independent specialist who has been looking after the car for the last 5 years.

I have not heard anything back yet, assuming the worst, i am looking for some advice on aspects of the engine i want checking before taking the car back. I would really appreciate some advice.

Thanks

Alex
 

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Discussion Starter #4
Were the rod bearing ever done?

Sent from my SM-N950U1 using Tapatalk
It's pretty much the only thing not done along with the usual vanos bits.

Sounds like an injector stuck open. Hope you didn't bend a con rod.

Also, 2007 is not LCI.
Yes i had assumed this too, assuming no bent rods, could there be other damage even if the engine restarts and appears to be ok?

It is LCI, at least the interior is, i assumed one of the first.

https://www.tlrautos.co.uk/used-bmw-m5-poole-dorset-2081436

Thanks

Alex
 

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Yes i had assumed this too, assuming no bent rods, could there be other damage even if the engine restarts and appears to be ok?

It is LCI, at least the interior is, i assumed one of the first.
My bad, forgot about europe where LCI may have rolled out earlier. Headlamps and interior are certainly LCI, but front bumper is missing the side reflectors. Then again maybe europe LCI's never had bumper reflectors.

As for the hydrolocking... assuming it's a fuel injector it may be ok. I'd ask for compression and leak down testing and go from there.
 

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Sounds like stuck open injector, hopefully no bent rods or scoring of the cylinder walls.
 

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Discussion Starter #7
Sounds like stuck open injector, hopefully no bent rods or scoring of the cylinder walls.
I hope so too man, spoke to the dealer yesterday who said the indy had ordered some parts for it. Assuming bent rods & scored bores, can these be picked up in compression tests? (Mainly the scored bore).

Not sure what my move should be if the engine is now in bad shape:

- Ask for my money back?
- Push for a replacement / rebuild?

Thanks

Alex
 

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Discussion Starter #9
Had a call earlier, apparently Injector 8 had failed, compression test came back with all cylinders ~8bar.

Going to replace all 10 injectors and swap out the oil.

Is a compression test really much use here? What about leakdown for bore scoring? How do you identify bent rods? Engine tear down? Im learning here still so sorry for the stupid questions.

Thanks for the help.

Alex
 

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One could use a caliper to ensure the piston is still extending all the way up (i.e. no bent rod). Injector failure is likely due to the gas filter letting crap through / disintegrating. Must change the filter.
 

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Discussion Starter #12
Ok thanks guys, i will push to get those done. Is a bent rod likely from hydrolocking under the start motors power alone? It locked after 3 or 4 cranks (i would just before it was about to fire).
 

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Ok thanks guys, i will push to get those done. Is a bent rod likely from hydrolocking under the start motors power alone? It locked after 3 or 4 cranks (i would just before it was about to fire).
It depends on the state of the engine when it hydrolocks, it could be due to a bent rod. To check scoring you would need a boroscope to confirm any damage.
 

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Discussion Starter #14
Got the car back yesterday, 10 new injectors and Fresh Oil / filter, seems to be driving great. No audible knocking and no smoke currently. Its bank holiday here in the UK so im going to get it into my indy Tuesday and see what he says.

Thanks

Alex
 

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Discussion Starter #17
Ok, maybe i will just do that myself I am not sure yet. One thing i have noticed is that at very low RPM's (1k - 1.75k) the engine seems to be a little rough (minor misfiring), maybe needs some new plugs? I have INPA so was going to see if i could inspect the combustion quality using it??? Any guidance would be greatly appreciated.

Thanks

Alex
 
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