5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
i just bought a 95 525i with abt 158k miles on it. the engine seems fine and ride is smooth. it does feel like a well kept car although i got a 2-good-2b-true deal.
the check engine light went on a couple of weeks ago and goes on n off from time to time plus i get burning fuel/rubber smell even after short driving. i just moved to portland, OR and don't know much abt repair shops here. i was thinkin abt goin to a nearby autozone and hav it checked there.
as it turned out.....the check engine light goes away after driving a little in M mode and it comes back after driving a while in S mode. i still get the burning smell though..
id appreciate it if somebody would comment...
well first i would probably go to an autozone and let them check the engine light out its free its a start. As for your your fuel rubber smell you will have to do a little investigateing Is there oil leaking in your engine maybe it needs to be washed get the oil and grease crap out of the engine? are the belts in good shape not rubbing against anything?check your tires are they ok? Try to look at all the hoses for any visible damage or wear.. used its tough one
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I assume it is an Automatic. The burning smell and the CEL might be related to the same issue, a fault in your transmission. Crawl under it and see if it is leaking tranny fluid also check and see if your tranny fluid is low. I would have it checked out soon either by an independant shop or the dealer.
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sounds to me like you have a vacuum leak. The two 02 sensor codes would lead me to believe that the sensor is reading off and has gone beyond it's range. The knock sensor fault would make sense with the 02 sensor codes because with the lean condition from the vacuum leak you are getting spark knock/detonation/pinging. Check all rubber intake boots for cracks and splits top and bottom as well as a secure connection.
As far as your description about the check engine light in relation to the M and S switch, I was suspecting either a faulty switch or more likely coke or other debris within the switch. The other possibility could be the gear selector switch. However, you mentioned no faults for the transmission. Therefore I suspect that the difference in M and S is putting a different load on the engine which affects the lean condition/02 sensors and knocking issue.
The burning smell is most likely not related, although there could be a correlation. However, I would suspect that you either have an oil leak, plastic bag or something on the exhaust or some insulation from the bottom of the floor pan has fallen down and rubbing against the driveshaft/flex coupler.
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I just found this thread hehe but the same thing happened to my E34 535i(except for the burning smell) and it was everything that you needed replaced!! but it didnt all happen at the same time like yours, first my O2 sensors were spanzing out so it knocked really hard in idle and then a week later it had the problem that you had with it working in different modes, M and E, but it turned out to be the fuel pump on that one!!
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