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Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 21382
Experience:  BEng hons Mech engineering, in auto industry 22 years
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420 gl: my 2007 420 GL wont kick down when going up hills

Customer Question

Hi my 2007 420 GL wont kick down when going up hills until revs drop below 1000rpm, only just stared doing it, any help much appreciated
Submitted: 1 year ago.
Category: UK Car
Expert:  Matt replied 1 year ago.
Hello

I'd take a look at the colour of the transmission oil it should be a dark red colour if its black then its needs changing together with its oil filter. Also check its level with the gearbox warm and just after you've moved the selector through all the positions leaving it for a few seconds in each one and then back to park.

You can top up the box through the side fill plug if required and make sure you use the correct oil for your car as the fluids are not all the same. Some manufacturers recommended a change of the type of fluid - Speak to the local dealer and parts dept - they will advise you on the updated fluid to use..

If that’s all OK then check all the electrical connections of the gearbox, remove each connector in turn and spray with contact cleaner. Check that the wiring to the gearbox is in good condition with no chafing or frayed wire

If this is OK then check the selector lever linkage / cable under the car for any broken parts and or missing bolts as if this is coming adrift then it can rub on the car body or just bind up

Then - you should top up if low and re try it - or, if its level is ok - and condition is ok - then the next step is to drain it off - open it up and clean the filters inside -- refill and retry it..

Often - just doing the above cures many troubles with these - and you certainly can't condemn the unit without doing the above...

Expert:  Matt replied 1 year ago.
Hi

do you still need help?