AWD Transmission: - "Popping" noise when coming on or off the accelerator

Banzai · Jan 25th, 2011, 17:51

Hi, I know noises are very difficult to describe or diagnose but here goes:

I have a sort of popping sound when I use or release the accelerator. it *seems* to happen much more when the engine is warmed up than it does direct from a cold start.

The popping or mild clunk as it could also be described happens within about half a second of the pedal being touched or released.

I don't think it happens when starting from stationary rather when easing off the pedal and then back on again.

It almost like there is some "slack" in the transmission, maybe a worn joint somewhere or something.

Anyone got any ideas?

Many years ago I had a Ford Explorer and I seem to recall it might have done the same thing but much less often or perhaps I didn't pay as much attention to it back then.

These 2 cars are my only experience of AWD, large SUV type cars and automatic transmissions so for all I know it might be normal.....

Thanks.

400-ascona · Jan 25th, 2011, 19:49

If its a T6 they are known for driveshaft problems.

stonehenge · Jan 25th, 2011, 19:54

Mine does the same and it is the vacuum adjusted engine mounts. Have a look under the engine bay you will see the vacuum pipes linking the mounts. These will react to throttle on and off as you say.

Why they have vacuum engine mounts rather than ordinary ones, I don't know. Perhaps someone can explain?

Banzai · Jan 25th, 2011, 20:08

Quote:

Originally Posted by 400-ascona

If its a T6 they are known for driveshaft problems.

Sorry, forgot to say it's a D5

Quote:

Originally Posted by stonehenge

Mine does the same and it is the vacuum adjusted engine mounts. Have a look under the engine bay you will see the vacuum pipes linking the mounts. These will react to throttle on and off as you say.

Why they have vacuum engine mounts rather than ordinary ones, I don't know. Perhaps someone can explain?

Thanks for the info.

Banzai · Jan 26th, 2011, 21:47

Quote:

Originally Posted by stonehenge

Mine does the same

I've been thinking about this, is it normal or are they shot?

Jan 25th, 2011, 17:51	#1
Banzai Member Last Online: Jul 30th, 2014 21:10 Join Date: Sep 2010 Location: West Sussex	"Popping" noise when coming on or off the accelerator Hi, I know noises are very difficult to describe or diagnose but here goes: I have a sort of popping sound when I use or release the accelerator. it seems to happen much more when the engine is warmed up than it does direct from a cold start. The popping or mild clunk as it could also be described happens within about half a second of the pedal being touched or released. I don't think it happens when starting from stationary rather when easing off the pedal and then back on again. It almost like there is some "slack" in the transmission, maybe a worn joint somewhere or something. Anyone got any ideas? Many years ago I had a Ford Explorer and I seem to recall it might have done the same thing but much less often or perhaps I didn't pay as much attention to it back then. These 2 cars are my only experience of AWD, large SUV type cars and automatic transmissions so for all I know it might be normal..... Thanks.

Jan 25th, 2011, 19:49	#2
400-ascona Premier Member Last Online: Apr 15th, 2024 10:13 Join Date: Mar 2008 Location: Derby	If its a T6 they are known for driveshaft problems. __________________ 1997 V70R AWD, Saffron, Manual; Lotus Carlton; Ascona 400; Mini Cooper S Works; 4.2 Supercharged Range Rover; Land Rover Discovery 4; Suzuki GSF1200N; BMW R80/7; Velocette Venom; Daimler V8 250.

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Jan 25th, 2011, 19:54	#3
stonehenge Junior Member Last Online: Aug 3rd, 2020 08:12 Join Date: Aug 2010 Location: Salisbury	Mine does the same and it is the vacuum adjusted engine mounts. Have a look under the engine bay you will see the vacuum pipes linking the mounts. These will react to throttle on and off as you say. Why they have vacuum engine mounts rather than ordinary ones, I don't know. Perhaps someone can explain?

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