2008 BMW 535i Misfire
03-08-2015, 09:16 PM
#11
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Location: Upstate NY
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My Ride: e60 535xi Prem. Package
Model Year: 2008 535xi
I had the same problems you had changed HPFP , injectors, sparkplugs and coils. What fixed my problem was changing thoses horrible bosh sparkplugs to a step colder plug NGK LASER IRIDIUMS (part no.ILZKBR7A-8G). They are around $80-100 shipped but worked for me.
Hope this helps.
Hope this helps.
03-09-2015, 07:15 AM
#13
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My Ride: 2008 535i2008 535i Monaco Blue
PP, SP, SAT w/paddles, AS, CA, L7,
NAV, PDC, Heated F Seats, SIRIUS,
iPod+Aux, Bamboo Anthracite Wood Trim
Before ditching the OE spark plugs, at least read the following post:
PTF BLOG: 1 STEP COLDER PLUGS FOR THE BMW N54 – NGK 5992 LASER IRIDIUM – ILZKBR7A-8G
PTF BLOG: 1 STEP COLDER PLUGS FOR THE BMW N54 – NGK 5992 LASER IRIDIUM – ILZKBR7A-8G
03-09-2015, 07:52 AM
#14
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My Ride: 535i sport
Well I never checked the gap on them. I just ordered off amazon and slapped them on. Definitely thought about trying diff plugs just couldn't decide on which ones. I'm gonna pull them and check the gap, if it's gapped right I will just switch to the NGK. Just really hope that is the problem. I did some quick logs that I will post.
03-09-2015, 08:18 AM
#15
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My Ride: e60 535xi Prem. Package
Model Year: 2008 535xi
03-09-2015, 09:33 AM
#16
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My Ride: 535i sport
Here is a log from this morning. It was a little hard to get a full WOT run because its raining pretty bad over here. So here is what I was able to get....
03-09-2015, 12:49 PM
#17
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My Ride: Alpine E60, '09 535i-Premium, Sport and Comfort Access PackageMods: Lux H8 V3 Angel Eyes, Weisslicht LED license plate lights, Interior LED lights, RPI Scoop, Matte Black Grills, Smoked LED side markers & side reflectors, 35% tint all around, and a 3
Unless you are running a heavily modified setup, FBO w/upgraded turbos, the Bosch OEM plugs work just fine. So in looking at a conversation being had in another forum about cyl 5 timing pulls there have been speculation around the the PCV location and how the oil vapor is lowering the oct levels in cyl 5. Some have have been able to change out their PCV to have the timing correction issue fixed in cyl 5. Since you have a bad PCV I'd replace it to see if that works. Also unless you are running meth I'd stick to map 5 since map 3 is designed to be used with meth which cools the air and raises the oct levels.
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