G300 Jammed Accelerator after kickdown
I have a 1998 G300 Automatic petrol vehicle which has completed 145000 miles. It has been mine for 12 years.
The car has a problem - after using kickdown to overtake a slower vehicle the car responds as expected - increased revs and speed but on completing the overtake and easing off on the accelerator the car speed does not reduce, the revs stay high (+4000) and the situation can only be corrected by moving the drive into neutral and braking to a standstill when the revs revert to normal and the car performs normally provided kickdown is not used. This is a very dangerous problem - can anyone help and advise?
Hi
check for worn/out of adjustment throttle linkage...with the engine not running have somebody press the accelerator pedal and watch what happens in the engine bay ..if it is a 280 engine look at the brown nylon fitting on top of the rocker cover this hardens with age and breaks which can cause erratic throttle action.....
Please check your email.
Hi
I am assuming (maybe wrongly) that the post should read a 1988 300GE? I thought a 1998 would be a G320? Anyway, just trying to identify which model we are on....not have a go!!!
Assuming its the 300 with the M103.987 engine straight 6 engine...
Aswell as the above posts, i seem to remember a small microswitch (A002 545 68 14) on top of the engine which was operated by one of the throttle linkages and had something to do with kick down cut off, post accelleration, they used to get hot and break down electronically or get gunked up and stop actuating.
They were a common switch in their day, used on the T1 van reverse light operation and the above on the M102, M103, M104 and M110 engines amongst other things....
Don't think they are mega bucks...
Could be wrong mind...
Cheers
Gav
Hi, when you have had it 12 years, you are entitled to forget!!
1995 was the very last year you will get a G300 petrol
It is a 300GE S (SWB) but from 1994 they were all rebadged G300 inline with the MB range
Its probably a 1994 car not registered until 1995
But anyway, yes thats what i had thought it was anyway, its just a few years newer than i had thought...
If you send me your email by PM i can send you some pics of the throttle linkage etc....
Cheers
Gav
The chassis number would help also...
On that year of 463 there is a micro switch under the throttle pedal that activates the kickdown when the pedal is fully depressed. Although I do not know if this switch could have some relationship with your current problem.
I take it that you have checked the obvious things like the throttle pedal is returning fully after being pressed and is not fouling on anything. Likewise checking that the throttle linkage in the engine bay is free and not getting stuck.
I would say the micro switch is mounted on top of the Inlet Manifold between cylinders 4 and 5 just behind the Throttle Housing and Fuel Head close to where the Throttle Cable mounts. May be worth checking out and cleaning.
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Gav
You would be perfectly entitled to have a go - you would expect me to know what car I have after all these years. I have always called it a G300 because that is what it says on the back door but on checking the registration documents the car is described as a 300GES AUTO with an engine capacity of 2962cc. It was first registered in October 1995 not 1998 that I listed.
Sorry for the misinformation - does the new correct information change the advice you gave me.
Stephen Robinson