135i check engine problems, missfire HELP

chadmmorris1982 · Jan 20, 2018

hi, I am new to the BMW community, I just recently purchased my first BMW, a 2008 135i. I love the car. But it is having some issues. And I think I kind of know what the problem is, but I really don't know much about BMWs. So sometimes I get a service engine soon light sometimes it goes off, also sometimes I get a engine light with that slash in middle sometimes it goes off as well. also at times u can feel the misfire but sometimes it wouldn't at all. and on top of all that I notice on some start ups it would take like 3 seconds or a few cranks to get motor started, and I had the engine scanned for codes and received a long list of codes

list of codes

0301 p0302 p0300 p0303 p0304 p0305 10701 10702 10700 10703 10704
10705 I believe these are all misfire codes

then I have code 12542 12544 I looked this one up something about turbocharger A overboost condition (PLAUS)

So I am just curious what could be the problem. One thought I had was the HPFP, the fuel pump from the research I have done so far. Any help would be appreciated so I know what im getting my self into. Thank you

Lordsnow · Jan 30, 2018

Personally I like to start with the low hanging fruit and work my way backwards. Do you know when the spark plugs were last done on it? I would replace them all. I went with the laser iridium plugs as they run cooler and are better for the higher boost levels. I picked up all 6 for $70 including shipping. I did have to gap the ones I got but you can get them pre gapped as well.

After that I would look at the coil packs. That is what caused misfires for me. You can get all 6 Bosch factory replacements for about $120.

My guess is one of those would solve the issues, not sure about the overboost condition, so I would start there and see if that fixes it. Even if they are not the cause it is good to maintain those parts.

stacychis · Mar 16, 2018

Make sure you have the latest injectors version 12, check vacuum houses they crack over time, check coil packs and spark plugs, check engine cover gasket. Hope this helps.

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stacychis · Mar 16, 2018

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manny2011 · Apr 10, 2018

R those 19 what size of tires did you swap? Did you lower it?
Great job!!!!!

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stacychis · Apr 10, 2018

manny2011 said:
R those 19 what size of tires did you swap? Did you lower it?
Great job!!!!!

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Yes thank you ,19 /8.5 front 19/9.5 rear stock suspension with 35 offset running agressive, on Hancook Ventus .Forged Rohana wheels.

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135i check engine problems, missfire HELP

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