E87 120I overfueling after rebuild

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AshO007
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E87 120I overfueling after rebuild

Post by AshO007 » Sun Mar 05, 2017 8:33 am

Hi guys, I'm new here and this is my first post. I have an '05 e87 with a N46 motor, a couple weeks back when driving home from work the vehicle started misfiring and had no power so I pulled the vehicle over and switched it off. I tried to start it again but it really struggled to start and when it did it was misfiring badly so I got a flatbed and got the car sent to my mechanic. We found that the bore between cylinder 1 and 2 cracked, so I had the complete block resleeved and skimed, the head was also skimed, we checked the pistons and found cylinder 1 piston was damaged so I replaced that with an original piston. Well my mechanic put everything back together and started the car and it started up fine, but then it started to misfire, we read the codes and we picked up cylinder 2, we found that the plug was wet with fuel, we thought because the engine is being started after a rebuild that's why there was extra fuel in the chamber. We replaced all the plugs and then started the car again and found that the car was over fueling and it picked up a fault for the essentric shaft motor being lazy so we changed the motor and sensor and that fault went away. But now the car is still overfueling. We tried a new fuel rail and injectors from another car and it's still doing the same thing, I need some help guys :( thanks in advance

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Re: E87 120I overfueling after rebuild

Post by marco_polo » Sun Mar 05, 2017 8:58 am

I'm surprised one new injector wouldn't have sorted the 'plug wet with fuel' issue.

MAF and lambda sensors all healthy?
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AshO007
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Re: E87 120I overfueling after rebuild

Post by AshO007 » Sun Mar 05, 2017 9:24 am

We didn't code the ecu because we used the same injectors, the injectors went back the same way they came out. It's not picking up any fault for any sensors, actually it's not picking up any faults at all. We removed the injector rail with the injectors from the head and we started the car, the amount of fuel being released by the injectors it's soo much as to compared to another N46 engine we tried, when we did swop the rail and injectors it was fueling the exact same. It's like the injectors are fully open

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Re: E87 120I overfueling after rebuild

Post by marco_polo » Sun Mar 05, 2017 9:33 am

MAF and lambda sensors all healthy?

Have you been running a K&N or similar oiled air filter? They're known to destroy MAF's.
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Re: E87 120I overfueling after rebuild

Post by AshO007 » Sun Mar 05, 2017 10:02 am

Stock air filter, all the sensors are okay according to my mechanic

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Re: E87 120I overfueling after rebuild

Post by marco_polo » Sun Mar 05, 2017 10:49 am

:?

Throttle position sensor behaving correctly?
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Re: E87 120I overfueling after rebuild

Post by Octavius » Sun Mar 05, 2017 11:23 am

I would swap out the injector and recode it if necessary.
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Re: E87 120I overfueling after rebuild

Post by Dan116i » Sun Mar 05, 2017 1:05 pm

Has the car been remapped? Possibly by a tuner that didn't know what they were doing?
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Re: E87 120I overfueling after rebuild

Post by AP1 » Sun Mar 05, 2017 3:34 pm

N46 injectors don't need programming, they are not the high pressure ones.

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Re: E87 120I overfueling after rebuild

Post by AshO007 » Sun Mar 05, 2017 4:03 pm

The vehicle hasn't been remapped. I'm going to go to my mechanic and check the car out for myself. Will update on what's going on. Thanks for all youlls help so far :) much appreciated

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Re: E87 120I overfueling after rebuild

Post by AshO007 » Fri Apr 21, 2017 11:49 am

Hi people, sorry for a late very late update :D found what the problem was, the engineer messed up big time, we found that the timing was slipping so the mechanic managed to sort that out but the problem went further. The car was running but the engineer over skimmed the head, so once the car was hot the timing was slipping causing the car to go into limp mode, eventually we stripped and found that he head was over skimmed and my mechanic listened my the engineer and put a normal head gasket instead of a oversized gasket. Oil and water started to mix in the coolant side as well. I didn't bother to try and selvage the head, so I had the bottom end checked out, everything good there and I just got a new head and stopped over all the parts from there, car is now running sweet :P thank you to everyone that commented, even if your comments didn't help in this situation I still would have picked up something on the line. BTW I am a BMW apprentice so and whatever you guys posted will help in the long run. :)

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Re: E87 120I overfueling after rebuild

Post by 50pence » Fri Apr 21, 2017 12:27 pm

I would say that's great feedback!

What mileage has your car done? We have an '05 E87 120i Sport that we bought as a second car about 7/8 years ago and for a couple of years it was our first car between the 123d and the M135i. It has done 103k miles now and still runs very sweetly, the chassis is also very taught and it's great to drive down twisting country lanes. The only issue is a slight metallic clunk from the dif when going on and off the throttle at low speed indicating a bit of play.
F20 M135i LCi, auto, adaptive suspension, adaptive LED + HB assist, h/seats, c/pack, elec folding & auto dimming mirrors, sun protection glass ...
E81 123d LCi M-Sport, manual ... (sold)
E87 120i Sport, manual ...

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