Westy144
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| posted on 31/7/13 at 02:51 PM |
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Horrible noise made when back off accelerator at speed
Hi all. I'm getting a weird noise from my car when I come off the accelerator, it's a Westfield megablade. The noise doesn't happen
when I accelerate,it's just when I come off. Usually at high ish speeds (40mph) The guy at the MOT garage said its probably something gearbox
related. Has anyone else had this? Any help would be appreciated as its really annoying and sounds dreadful.
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Jon Ison
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| posted on 31/7/13 at 02:59 PM |
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All/any gear? Prop shaft ok, all bolts tight? Just a thought.
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twybrow
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| posted on 31/7/13 at 03:04 PM |
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As above, check your prop shaft bolts, and hub adapter is tight.
Can you pin it down to front or rear? Ie could it be your diff? Does it make the noise with the clutch in as well? Have you tried going into neutral
whilst moving, and seeing if you still get the noise?
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Norfolkluegojnr
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| posted on 31/7/13 at 03:11 PM |
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clutch possibly? I had a weird noise on an MX5 previously that turned out to be the springs in the clutch plate. It only resonated at certain points,
mainly on over run. Sounded like a load of nuts in a biscuit tin.
does it make noise when out of gear at the speeds?
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swanny
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| posted on 31/7/13 at 03:15 PM |
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what kind of noise? whiny diff?
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YQUSTA
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| posted on 31/7/13 at 03:29 PM |
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My friend has exactly the same problem.
We swapped the diff - no difference
Raw changed a drive shaft that had shredded itself - no difference
Raw then changed the diff - no difference
We have heard that it maybe gearbox and is normal on the blade but i'm still unsure what it is.
"If in doubt flat out"
Colin McRae
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zoidy
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| posted on 31/7/13 at 04:12 PM |
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I had a similar thing 2 months ago, all of a sudden the engine/gearbox started to make a horrible clunky noise in 3rd when lifting the foot off the
accelerator.
Not too concerned as it was driving exactly the same as before, but a month ago on a trackday, the gearbox just gave up and punched a nice hole
through the compartment (complete loss of drive and oil).
But that could also be specific to my engine as it was a really "special" one.
My new blade engine sourced and installed by Andy Bates doesn't have this noise, obviously 
Good luck with yours, but you will probably have to have a close look at the gearbox internals.
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Westy144
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| posted on 31/7/13 at 04:42 PM |
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Thanks for all the replies. When I got the car the guy said it was because the diff was set to lock very quickly so was making the noise,but I could
get it set looser and wouldn't make the noise,could that be it? It makes the noise in all gears and only when I back off the accelerator in
gear. I haven't tried whilst in neutral,can do at the weekend. Had prop shaft checked and they said it was very loose so tightend that all up
but it still makes the noise after. I would say the noise comes from the rear of the car,all i can explain it as is like metal on metal?
Appreciate your help though. Expect it's going to have to go into a specialist but I was just wondering if this is common so I can have bit more
knowledge before taking it anywhere.
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Westy144
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| posted on 31/7/13 at 04:43 PM |
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O and it drives absolutely normally,it just makes this horrible noise.
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dave_424
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| posted on 31/7/13 at 04:52 PM |
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Describe the noise in more detail, is it a thunk kind of noise, or a continuous kind of noise?
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Westy144
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| posted on 31/7/13 at 05:05 PM |
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It's a continuous noise,only stops when I accelerate or going very low speeds. It's like a metal shearing noise grinding on metal is what
it sounds like. kind of like two metal plates grinding together. I also checked the oil yesterday and that's all ok. I tried record it but its
hard to hear over the wind noise on audio.
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IanG1
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| posted on 31/7/13 at 05:09 PM |
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Out of interest, you running a reverse gearbox?
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Westy144
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| posted on 31/7/13 at 05:13 PM |
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Yeah I have a electric reverse that has a cog that when you press the electric reverse button the cog goes onto the prop shaft and spins it in
reverse. Could that be it?..
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jiwillia
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| posted on 31/7/13 at 05:27 PM |
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quote:
Originally posted by Westy144
Hi all. I'm getting a weird noise from my car when I come off the accelerator, it's a Westfield megablade. The noise doesn't happen
when I accelerate,it's just when I come off. Usually at high ish speeds (40mph) The guy at the MOT garage said its probably something gearbox
related. Has anyone else had this? Any help would be appreciated as its really annoying and sounds dreadful.
Wheel bearing?
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jacko
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| posted on 31/7/13 at 05:48 PM |
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What diff has it [ sierra ] ? has the bolts come loose that hold it to the chassis ?
could it be a bearing in the diff ?
are the brakes ok could they be catching in any way [calipers coming loose ]
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Westy144
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| posted on 31/7/13 at 06:09 PM |
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Its a Quaife LSD diff, live axle. Clutch played diff. The car just got through MOT yesterday and they didn't say anything about breaks or wheel
bearings so can probably rule that out.
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IanG1
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| posted on 31/7/13 at 07:28 PM |
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quote:
Originally posted by Westy144
Yeah I have a electric reverse that has a cog that when you press the electric reverse button the cog goes onto the prop shaft and spins it in
reverse. Could that be it?..
Doubt it with that set up, if like me you had an inline reverse gearbox they clunk,whine and make all sorts of noises.
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