10-04-2022, 01:49 AM | #1 |
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X5M Tune Causing Exhaust Smoke?
I recently installed catless downpipes and a tune on my X5M. After about a day or two running the setup, my car began to smoke excessively from the tailpipes. At first it was constant from the second you turned her on. I replaced the PCV hoses coming off the manifold attaching to the turbos and that seemed to immediately fix my problem. Two days later and I noticed when in M Mode and manually shifting, the car was again smoking from the tailpipes. When in boring mode the car does not smoke. Could my tune be causing this? I had the tuner option in exhaust burble, and have read a bit about the excess fuel causing smoke. Just wanted to hear some thought from you all before I head down the rabbit hole of reversing the tune, and replacing everything under the sun such as turbo seals, turbos, injectors, and lastly valve stem seals. Just seems a bit suspect since I had smoke at all before removing the cats and installing the tune.
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10-04-2022, 09:00 AM | #2 | |
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What tune are you using? Does it release a massive amount of smoke when accelerating from a stop after sitting at a light under normal acceleration? Grab a elm32 ob2 scanner and app like torque to monitor your air/fuel ratio on both banks to determine if its running so rich its smoking. How much oil are you burning? If you are using more then a liter every 700 miles, your valve stem seals. Crankcase vacuum. Drill and tap your oil filler cap or split one of the valve cover lines and install adapter for a 1/8npt fitting for a pressure gauge. Factory BMW CC vacuum is about -1 psi at idle, underboost CC should be between 0 and 1 psi. Turbo oil return lines: More of an issue on the 50i then M as 50i is tuned to run hotter but these are known to coke up on the M too. You will burn an excessive amount of oil (liter every 200 miles or less) depending on how plugged up they are. |
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10-08-2022, 11:08 AM | #3 | |
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