Autobox thump / Sticky cold start |
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Shem
Groupie Joined: 04-November-2005 Location: Hampshire Status: Offline Points: 51 |
Posted: 09-November-2005 at 14:35 |
Pity we are not paying 1980's petrol prices! the sad thing is my mate is
getting better mpg out of his v8 M5 and he drives it like a rental. I've just done another tank of the most economical driving I can muster and averaged 19mpg based on miles/gallons. With regard to the thump problem, checking the service history reveals, engine mounts, gearbox mounts, Bushes, Gearbox oil and Diff oil were all changed at the last service (2000 miles ago). Maybe this was in a bid to cure the problem which failed. Dispite the cold start issue happening nearly every morning now I still love the car |
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What fuel crisis?
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UKDaveJ
Really Senior Member II Joined: 18-November-2004 Location: Bromsgrove, Worcestershire Status: Offline Points: 529 |
Posted: 09-November-2005 at 16:51 |
I would recommend changing that diff mount, although generally until
you change it its very difficult (unless in very very dire state) to
see any damage.
When I changed mine, the old one looked fine on the car, but the rubber part was all knackered when I took it off. Good luck. Would be worth getting your afm checked out, possibly by an indy. |
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My 635's.
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Shem
Groupie Joined: 04-November-2005 Location: Hampshire Status: Offline Points: 51 |
Posted: 29-November-2005 at 09:03 |
Update on issues: I have replaced the DME with the 0 261 200 179 model which technically should go in an '89 car and this has cured the cold start problem and in many respects made the car better. However tickover is now a bit lumpy and fuel econonmy is only slightly better. With more time to monitor the gearbox thump I have realised that it is much worse when the car is cold which I think suggests either a worn box or bad oil. I need to replace the oil cooling pipes anyway so I will do a complete oil change at that time and see if it improves. The strange bit is that the new DME immediately improved the thump so now it only really occurs under hard acceleration or randomly. The other thing I've noticed is that the box now has more tendency to hunt between gears at slower speeds, e.g. 40mph. Suddenly the car will feel like its dying but in reality it has kicked down a gear and the engine is braking the car. Whilst my car requires the 1 261 200 150 DME I'm told that any DME from an 3.5L M30 engine around the same age will suffice (e.g. e34 535i and e32 735i) and in my experience it certainly works but I wonder if there are some small incompatibilities? |
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What fuel crisis?
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Sohlman
Really Senior Member II Coupe Chairman Joined: 19-August-2003 Location: Surrey Status: Offline Points: 1259 |
Posted: 29-November-2005 at 13:25 |
Had a very economical year in that respect. Must of done about 300 miles to eh no gallons. |
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Sunday 10th July Brooklands Sharkfest and Big Coupe Day. Coupe Events
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eta.
Really Senior Member II Joined: 21-October-2002 Location: United Kingdom Status: Offline Points: 599 |
Posted: 30-November-2005 at 06:25 |
Are you measuring MPG via the OBC? My 735, after a repair, was returning 19 ref the OBC. Turned out it had been reset as US gallons. When set to Imperial, MPG improved to 24.5!
Might be worth resetting by the small indent lower left on the OBC. Edited by eta. |
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Shem
Groupie Joined: 04-November-2005 Location: Hampshire Status: Offline Points: 51 |
Posted: 01-December-2005 at 17:20 |
Figured that one already. I WAS getting 14.5 mpg
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What fuel crisis?
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Brucey
Really Senior Member II Joined: 07-March-2004 Location: United Kingdom Status: Offline Points: 744 |
Posted: 02-December-2005 at 00:22 |
-do change the oil filter in the gearbox when you change the oil- this will likely be clarted up. Also (and this might seem bloomin' obvious but then again not) do make sure that you check the oil level in the gearbox when the engine and tranny are fully warm, and the engine is running, as per the owner's manual. cheers
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~~~~~~~ Brucey ~~~~~~ |
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