E39 535i Low idle
Printed From: Bavarian-Board.co.uk - BMW Owners Discussion Forum
Category: Technical & Model Specific Forums
Forum Name: BMW 5 Series
Forum Discription: This forum will deal with any issues on the BMW 5 Series (E12, E28, E34, E39, E60 & E61)
URL: http://www.bavarian-board.co.uk/forum_posts.asp?TID=43356
Printed Date: 05-May-2024 at 06:43
Topic: E39 535i Low idle
Posted By: jaysusbob
Subject: E39 535i Low idle
Date Posted: 08-December-2008 at 17:39
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Hey guys, i'm new to this and am more than a little confused! I bought a 2000 535 8months ago, all started well but slowly the idle speed became worse, now it just sits at 500rpm and occasionally dives to about 200rpm if i'm braking and then pops back up! Sounds abit rough also, but she's never missed a beat! Any ideas what could be causing this? Also i think the mpg has gotten worse since this started! Thanks |
Replies:
Posted By: Stone-IslandV8
Date Posted: 08-December-2008 at 18:39
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IIRC 500 is about right on the V8s...the 540 sits at about 500 but not the dive.
Might be a lambda probe,02 sensor,MAF or might be oil seepage into the plugs causing misfire. Get it on a diagnostics and see whats what. ------------- Gentlemen I may not have a brain but I do have an idea Past; E39 540T/E46 328CI/ E39 535/ E39 520/ E36 M3/ E36 318iS jet black Mtech/ E46 320d/ E36 318iS diamond black/ E36 318iS blue Mtech kit |
Posted By: Andrew Rolland
Date Posted: 08-December-2008 at 18:47
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Yeah my V8 idles at a rather low 500 rpm as too did my first V8. I was driving a company Focus last week at I noticed that it was idling at 800 rpm which to me now seems really fast. Is it a manual or auto? I'm sure this has happened to others on here. Didn't Studyolic have this problem on his 535? Try doing a search on here. Pity he isn't about anymore. Engine could just need a good service, oil, fuel and air filters changed along with new spark plugs. Try running it on VPower and use a fuel system cleaner i.e. redex. Andrew PS Welcome to the forum. ------------- Be exclusive and drive a Petrol 5 Series! Current '13 62 F10 535i MSport Auto Previous '04 04 E60 545i SE Auto '03 53 E60 545i SE Auto (Stolen) '98 S E39 523i SE Auto |
Posted By: Stone-IslandV8
Date Posted: 08-December-2008 at 20:11
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Isnt there a run-safe programme on the MAF which can be used to check if its working ok? IIRC with the car at idle you disconnect the MAF...if the car idles and drives better then the MAF is at fault. ------------- Gentlemen I may not have a brain but I do have an idea Past; E39 540T/E46 328CI/ E39 535/ E39 520/ E36 M3/ E36 318iS jet black Mtech/ E46 320d/ E36 318iS diamond black/ E36 318iS blue Mtech kit |
Posted By: jaysusbob
Date Posted: 09-December-2008 at 00:37
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Cheers guys, it's an auto! it's gonna need a service pretty soon actually, so i'll prob get a diagnostics done soon, and then give her a really good service!! |
Posted By: Hasso
Date Posted: 09-December-2008 at 06:11
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You should ALWAYS have´the AC button ON on a BMW V8, gives 150rpm + and its needed to get the alternator work OK it starts charge at around 600 rpm. (BMW recomendations from BMW TIS) Its also possible to rise the idle with Diagnosprogram at BMW dealer. ------------- BR Hasso BMW 540T 2001 6 speed. BMW 316G (biogas) -1998 http://www.autopower.se/galleriet/bilder.asp?bil=40895 http://www.autopower.se/galleriet/bmw.asp?bil=45700 http://www.autopower.se/galleriet/bmw.asp?bil=40865 http://www.autopower.se/galleriet/bmw.asp?bil=45749 |
Posted By: jetsetwilly2000
Date Posted: 09-December-2008 at 11:46
Personally I just use driving to keep my revs over 500  . If I only ever idled it I could see how having the a/c on would be a good bodge to keep the alternator charging, but traffic here isn't that bad....yet.As for the dive problem, a diagnostic is probably wise, but both of my V8s really benefitted when I just changed the plugs and filters, put several loads of injector cleaner through and ragged the a*** off 'em for a couple of weeks!... I think the bigger engines get pootled too much. ------------- E90 M3 DCT, E46 330d Touring, VW T5 wannabecamper Previous: Disco 3 TDV6, 2x E34 540i6, E34 535iS |
Posted By: jaysusbob
Date Posted: 17-December-2008 at 23:08
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Thats a nice tip about the AC seems to help and it seems to stop it diving so much to! Once the christmas is over i'll have to treat her to a nice service/diagnostic and some tlc! She deserves it!  |
Posted By: Andrew Rolland
Date Posted: 18-December-2008 at 08:39
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When I put my AC on she idles at 750 which means car has to be taken when sitting stopped at lights etc as with being auto she is really trying to get away from you. Creep is certainly quick! Andrew ------------- Be exclusive and drive a Petrol 5 Series! Current '13 62 F10 535i MSport Auto Previous '04 04 E60 545i SE Auto '03 53 E60 545i SE Auto (Stolen) '98 S E39 523i SE Auto |