02-26-2020, 11:23 PM | #1 |
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Symptoms my 335i is having
Okay so to kick things off my oil temp gauge Does not move. I've done the system test and seen it move. And did the hidden menu and saw the temps were at operating temperatures. In the hidden menu it says that the coolant temp is -128C which doesn't sound right and doesn't move. When I go into sport mode and Manuel shift the radiator fan spins really loud, like a jet engine loud.
My car has bootmod3 stage 2 tune, catless, charge pipe, intake, intercooler What is causing these issues |
02-27-2020, 07:42 AM | #2 | |
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02-27-2020, 07:46 AM | #3 | ||
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06-18-2021, 03:45 AM | #5 |
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Not sure this will help you (new poster), but I just read that BM3 might be suppressing codes, so maybe code back to stock and see if some codes pop up?
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06-18-2021, 07:09 AM | #6 |
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07-11-2021, 07:58 AM | #8 |
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UPDATE: Cleared all codes and instantly everything was back to normal. Oil temp gauge working, no CEL. Have driven 3 weeks without issue.
Initially I tried swapping the ECT sensor near the oil filter housing before I had access to someone with OBII setup and that had zero effect. Still got the same -128 C reading. It looks like the expansion tank leak caused a short somewhere in that instant and the ECU never trusted the reading again afterwards. Once I cleared the codes everything was perfect. (Never actually swapped ECT sensors, just plugged the new one into the harness as quick data point) |
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