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DIY: Do It Yourself
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Old 06-30-2015, 03:44 AM   #1
Mark Sime
Registered User
Join Date: Jun 2015
Location: Woolacombe
Posts: 1
My Ride: 323ci
Question M54b30 manifold swap EML codes

Hello Guys
I've been using this site for years for all my problem solving etc.
Its finally come to the point were I'm facing a new problem.

I've just done the m54b30 manifold swap into my m52tu, all went well pretty straight forward.
On start up for the first time I had a rough idle and vacuum leak on my DISA seal, so I went about scraping the moulded seal out and replacing it with the correct o ring; Idle problem solved and no leak.
I then sat in the car and gave it a few rev's, bearing in mind its the first the car had seem some beans since the swap. I then got a check engine light throw up and proceeded to get the following codes:

P0170 Fuel Trim Malfunction (Bank 1)
P0173 Fuel Trim Malfunction (Bank 2)
P0306 Cylinder 6 Misfire Detected
P0305 Cylinder 5 Misfire Detected
P0304 Cylinder 4 Misfire Detected

My thinking is that due to the new mass of air flow the ecu needs time to change to allow for the correct air fuel mixtures to adapt therefore solving these codes. Am I right?
I would appreciate advise from anyone who has come across similar and could help please.
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323, check engine light, m52tu, m54b30 intake manifold

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