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E39 problems, |
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muttley64
Forum Member Joined: 30 Dec 2013 Location: Birmingham uk Status: Offline Points: 6 |
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Posted: 31 Dec 2013 at 11:17am |
Hi, I wonder if anyone can help, I have a 2002 E39 525d sport, I had problems starting it about 3 weeks ago, the engine just whizzed over, I thought it was out of fuel so when it eventually started it i got it to the garage and filled it up, after leaving the garage it wouldn't rev past 3000 revs, I thought it was in limp mode, a couple of miles down the road it revved to 3800, then 4000, then it wouldn't go past 2800 , the revs are fluctuating throughout every press of the accelerator pedal , I've changed the pump in the tank, and also changed the fuel filter in the engine bay, any ideas please, thanks for your time, Gaz
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Cambell
Club Member Joined: 09 May 2011 Location: Gods Country Status: Online Points: 1025 |
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Sounds like a faulty sensor or accelerator pedal to me
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muttley64
Forum Member Joined: 30 Dec 2013 Location: Birmingham uk Status: Offline Points: 6 |
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thank you for answering to my query, I found out this morning when I start it up and put my foot flat to the boards she revs to the max, the a few seconds later the revs drop and hold at 4000, any ideas,
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Cambell
Club Member Joined: 09 May 2011 Location: Gods Country Status: Online Points: 1025 |
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Tell you what, you could also have a problem with a burst / cracked air pipe and the engine is getting unmetered air
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muttley64
Forum Member Joined: 30 Dec 2013 Location: Birmingham uk Status: Offline Points: 6 |
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Hi I appreciate your help, where can I find the air pipe
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Ian86
Club Member Joined: 30 Dec 2013 Location: Northants Status: Offline Points: 13 |
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Start the engine up and listen for a hissing or sucking sound and try and locate it from there. I share your thoughts and look into the fuel supply of the engine, are the injectors leaking?
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Cabrio
Register Chair E30 Register & Competition Secretary Joined: 24 Aug 2006 Location: United Kingdom Status: Offline Points: 6625 |
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Get the codes read and come back to help diagnosis...has it been hard to start any different when colder cheers
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E30 Register joint coordinator - Competition Secretary - Contact name Neil for PM and Email - cabrio_e30@yahoo.co.uk - be aware addicted to E numbers
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muttley64
Forum Member Joined: 30 Dec 2013 Location: Birmingham uk Status: Offline Points: 6 |
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Hi sorry been gone awhile, been working away, no theres no leaks or hissing sounds, and no fault codes are showing up, |
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muttley64
Forum Member Joined: 30 Dec 2013 Location: Birmingham uk Status: Offline Points: 6 |
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I have found when ( at any time hot or cold ) I start it up for the first few seconds its quite happy to rev right in to the red band and hold there, then its as if something kicks in and reduces the revs |
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Cabrio
Register Chair E30 Register & Competition Secretary Joined: 24 Aug 2006 Location: United Kingdom Status: Offline Points: 6625 |
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Surprised no fault codes who has read it as sounds like resets then goes into limp when driven could be any number of things so would be guessing without more of a steer
Does abs or traction light come on Also worth checking for any poss bad connections on earths and abs plug etc But get a proper code reader on it before costing money and time |
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E30 Register joint coordinator - Competition Secretary - Contact name Neil for PM and Email - cabrio_e30@yahoo.co.uk - be aware addicted to E numbers
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gary
Club Member Joined: 08 Feb 2009 Status: Offline Points: 900 |
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Could be a MAF problem as well
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Cabrio
Register Chair E30 Register & Competition Secretary Joined: 24 Aug 2006 Location: United Kingdom Status: Offline Points: 6625 |
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Could be but that would show on computer if code read also it would not rev ok when reset if unit faulty it would be likely to cut out but guessing again needs proper code read as be something silly as had it before when just a bad connection and sadly that won't show but codes may give a steer
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E30 Register joint coordinator - Competition Secretary - Contact name Neil for PM and Email - cabrio_e30@yahoo.co.uk - be aware addicted to E numbers
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Ian86
Club Member Joined: 30 Dec 2013 Location: Northants Status: Offline Points: 13 |
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I still believe this is a fuel feed problem,as Neil said its odd no codes are being thrown up. Can you smell Diesel in the engine bay at all?
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AShah
Forum Member Joined: 27 Jul 2011 Location: Bridgend, Wales Status: Offline Points: 423 |
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Throttle position sensor, its a known fault on E39's.
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E36 home of South Wales!
'96 Alpina B3 3.2 Touring '91 325iSEA 4 Door Old: '93 325 Coupe '96 318is Coupe '92 320 Coupe '96 318is Coupe '97 328 Cabriolet '95 M3 4 Door '99 323 Sport Tourer |
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Cabrio
Register Chair E30 Register & Competition Secretary Joined: 24 Aug 2006 Location: United Kingdom Status: Offline Points: 6625 |
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Brings me back to the codes from the reader as a tps can show various faults but more common in the petrol engine versions ....what codes showed and with what machine
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E30 Register joint coordinator - Competition Secretary - Contact name Neil for PM and Email - cabrio_e30@yahoo.co.uk - be aware addicted to E numbers
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Cabrio
Register Chair E30 Register & Competition Secretary Joined: 24 Aug 2006 Location: United Kingdom Status: Offline Points: 6625 |
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FYI in an e39 it will often show historical codes at least that might give a clue to problem and the decent ones will test sensors and switches as can get expensive just fixing things but if keeping it then long term can't hurt I guess if can afford it now
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E30 Register joint coordinator - Competition Secretary - Contact name Neil for PM and Email - cabrio_e30@yahoo.co.uk - be aware addicted to E numbers
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Howard
Club Member Joined: 08 Mar 2013 Location: Huddersfield Status: Offline Points: 538 |
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I have the same problem on my E24. I am advised by the experts to take off the bypass valve and give it a clean and oil.
Temporary fix - let it run until its warmed up and the problem goes away - until the next cold start. |
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1988 635csi,
2002 E39 525i, 2001 E38 740i 2003 E39 525i motorsport |
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