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18th February 2018, 00:33 | #11 |
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According to the Haynes manual, there are 2 wiring connectors clipped to the front of the transmission, which, once released from their brackets, should be twisted apart. The gearbox ECU will also show any stored faults if connected to T4 diagnostics. It is quite possible that the 2/3rd gear solenoid valve is the only one sticking, then suddenly activating/unsticking, causing the jerk. Changing the ATF (you may need to do 2 changes to ensure the majority of it is replaced), should help clean any sticky residues from the oil galleries and valves.My Audi A4 B5 used to change from 3rd to 2nd automatically with a slight jerk as it slowed down, but manually shifting from 3rd to 2nd, it would wait until the speed was reduced to the set parameters before dropping down fairly smoothly. My old Mitsubishi 4x4 (1991) does not seem to change down in this way, but always seems to be in the right gear when I re-apply the accelerator - smoothest Auto I know - as smooth and predictable as wife's tiptronic SLK box.
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18th February 2018, 00:35 | #12 | |
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Quote:
I reckon you are 100% with the diagnosis.
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18th February 2018, 03:22 | #13 | |
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18th February 2018, 03:49 | #14 |
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I changed my fluid, and it completely transformed the box and especially the upshift from 2 to 3, as far as I remember.
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18th February 2018, 07:07 | #15 |
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Had exactly the same symptoms after my car had been parked for about 4 weeks of no use.
First time i started it up the changes were terrible for about 15 minutes and then came good, next day same thing for about 10 minutes, next day ran perfectly and has done ever since ( 4 years ago) Turns out the solenoids were sticking A good oil change will probably fix it. If not, solenoids can be changed without the auto being removed |
18th February 2018, 07:22 | #16 |
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We have run autos for past 20 years because my wife can't drive a manual, ATF changed every 3 years or 30K religiously last but one car had 300K miles no problems with the auto box, same on the Honda Auto she runs now. Considering the cost of a replacement box or a rebuild at £1200 it makes a lot of sense to me anyways.
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18th February 2018, 15:35 | #17 | |
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Cheers, Glenn
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20th February 2018, 20:57 | #18 | |
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Simon
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21st February 2018, 06:30 | #19 | |
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Chevrolet put an external-only cooler on my 3/4 ton 7.4 litre truck as part of the factory towing package. I am somewhere around 275,000 kms on that one and it has pulled a lot of weight (5th wheel camper) up the same hill that killed the Q45 transmission (Coquihalla Highway in British Columbia). The autos in Audi A6's (I had one) are famous for failing solenoids. I have to wonder of heat (fluid at 190F) contributes to that. Coolers are cheap as are fluid changes every 2 or 3 years. Lots of folks will plumb an external cooler in series so the fluid cools after it leaves the in-tank heat exchanger. This works but bypassing it works better. Anyway, my experience. Cheers, Glenn
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21st February 2018, 06:43 | #20 |
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Hi, Having the auto box oil cooler in the rad caused Mercedes owners numerous and very expensive problems. So no amount of oil changes will fix that issue..fitting an external oil cooler has to be a good move especially towing a lot with an auto.
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