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07-21-2023, 10:39 PM | #1 |
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HELP...Low Boost/Power 6.8 psi max...what could be wrong?
Hello everyone, I am having very frustrating low boost/power issues. I measured using an app that shows live data via OBD 6.PSI max boost achieved. And it feels it. Whats weird is every few days, the boost will come back to what feels like how the M5 should feel. Then will go away the next day.
Here is what I have already tried: 1) Checked Vacuum lines at mufflers 2) Original Chargepipe was leaking, replaced with new upgraded one and no difference 3) Replaced torn intake boot, no difference 4) Replaced both sides crankcase hoses that were leaking, no difference. 5) Checked vacuum line by the driver side airbox and it is solid. 6) Cleaned MAF with CRC Cleaner Don't know where else to look. Any help appreciated!!
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Current: 2015 F10 BMW M5, 2005 E46 BMW M3, E93 2009 BMW 328i
Previous: 2002 BMW E65 745i, 2004 BMW E46 M3 SMG, 2004 E46 BMW M3 6SPD, 2002 E46 M3 SMG Vert, 1997 BMW E36 M3 Sedan AA SC, 2001 BMW E39 M5, 2009 E93 BMW M3, 2010 E60 535i M Sport Last edited by E46MysticM3; 07-22-2023 at 01:14 PM.. |
07-22-2023, 02:04 AM | #2 |
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209k miles okay, all stock I presume. Both MAF's CRC spray cleaned? at those miles it may be beneficial to replace them if not done so already and nothing is blocking the stock air box intakes at the bottom or has been sucked up to the air filters.
I'd be removing all that and checking. |
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07-22-2023, 01:15 PM | #3 | |
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Quote:
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Current: 2015 F10 BMW M5, 2005 E46 BMW M3, E93 2009 BMW 328i
Previous: 2002 BMW E65 745i, 2004 BMW E46 M3 SMG, 2004 E46 BMW M3 6SPD, 2002 E46 M3 SMG Vert, 1997 BMW E36 M3 Sedan AA SC, 2001 BMW E39 M5, 2009 E93 BMW M3, 2010 E60 535i M Sport |
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07-22-2023, 02:17 PM | #4 |
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Could be spark plugs crying enough at higher revs, a coil that's nearing its end or simply tired turbos that need reconditioning.. I gather the turbo coolant pump is working fine and the little reservoir is topped up.
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07-22-2023, 04:37 PM | #5 |
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Okay…so this is getting strange now. I unplugged the battery for 30 seconds to reset itself. Car just logged nearly 17psi and pulls like a freight train. I wonder if this is software??
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07-22-2023, 05:00 PM | #6 |
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Reservoir level is good, how do i know the turbo coolant pump is good?
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07-22-2023, 08:41 PM | #9 |
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07-23-2023, 02:23 PM | #10 |
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I can’t, but like I said they’re easy to change out. All 4 aren’t too bad. Maybe start with the top two?
If you need a guide you should watch YouTube videos on how to install catless downpipes. Removal of o2 sensors is one of the steps. |
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