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The mkiv Supra Owners Club

Urgent help needed with gearbox and scraping noise?


supra_24
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Hi guys,

 

Recently had a strange scraping noise appear underneath my Supra when driving around on occasion.

 

I at first believed it to be a wheel bearing or possibly my exhaust rubbing again on a heat shield etc as it was occurring when the car was moving.

 

However, today with the scraping sound still apparent I was driving down a nearby road in 2nd gear at around 20 mph and the accelerated and went to change to third gear as normal, the car went into third gear fine but then I had a massive lack of power within 3rd gear.

 

I slowed down and went back to 2nd gear, then even slower down to 1st. I then started off again going up to third gear, this time the gears felt a bit firmer/more resistant than usual and third gear still had a lack of power.

 

At this stage I stopped the car and tried to go through the gears again and third then had the usual power back and gears seemed smooth. very strange I thought.

 

First time this has happened and both the v161 6 speed gearbox and spec stage 1 clutch and spec lightened flywheel were new last august.

 

Admittedly there had been in the past one or two occasions where I accidentally slipped the clutch for a second. But surely the above issue could not just appear.

 

 

Any advise and help on this would be great, as I am a little concerned regrading driving it due to the above?

 

My spec is as follows:

 

93 Toyota Supra single turbo Borg Warner 6266

 

HKS silent hipower exhaust system

 

6 speed v161 gearbox, new last august

 

spec stage 1 clutch new last august

 

Spec lightened flywheel new last august

 

Syvecs S6 ecu

 

Toucan touch screen with all maps and traction control programmed in.

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Pretty hard to say, as I haven't seen it and I'm not a mechanic :D

 

But is there any grinding etc when going into gear? And is it definitely going into gear properly? And when you describe "going into gear", it the sensation through the gear knob or the clutch pedal?

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Pretty hard to say, as I haven't seen it and I'm not a mechanic :D

 

But is there any grinding etc when going into gear? And is it definitely going into gear properly? And when you describe "going into gear", it the sensation through the gear knob or the clutch pedal?

 

No grinding what so ever going into gear. No weird noises etc.

 

The scraping noise happens on the very odd occasion for around 3 seconds when Im cruising along. Does not happen on gear change.

 

When I had the power loss in 3rd gear, the gear stick felt a bit more clucnky than normal going into gears.

 

At the moment however since earlier when this happened. The gear stick, clucth etc are all smooth as normal and power delivery through all gears is also fine.

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Doesn't Syvecs always run in limp mode until the oil get up to temperature?

 

Like I said, it's hard to tell, but I'd guess a clutch issue of some kind. I would find it hard to believe you could have broken a gearbox in 6 months of road use.

 

I'd probably give Paul at Whifbitz a call on Monday morning and see what he says. Suffice to say, I would avoid using the car, or certainly avoid anything but careful driving until the issue is resolved.

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Doesn't Syvecs always run in limp mode until the oil get up to temperature?

 

Like I said, it's hard to tell, but I'd guess a clutch issue of some kind. I would find it hard to believe you could have broken a gearbox in 6 months of road use.

 

I'd probably give Paul at Whifbitz a call on Monday morning and see what he says. Suffice to say, I would avoid using the car, or certainly avoid anything but careful driving until the issue is resolved.

 

 

Ok thank you very much for your help. Really do appreciate it.

 

Yeah I would be shocked if it were the gearbox. Highly doubt it.

 

I agree, it may well be a clutch issue, which may also be the reason for the scraping noises?

 

I am driving the car down to my local specialist on Monday morning to investigate. He is around 25 mins away from where I live, I will just have to take it easy i guess.

 

Will keep you all updated as soon as I find the cause of the issue.

 

If it is the clutch then I will just have to get it replaced.

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  • 2 weeks later...

Well just a quick update on what happened. The above scraping/rattling noise turned out to be my screamer pipe touching the exhaust. It seemed to have had worked itself close enough to the exhaust to hit against it. This has now been adjusted and no longer makes any strange noises.

 

The gearbox was fully tested over the period of a week and so far (touch wood) no issues are apparent.

 

As my mechanic rightly said which i didn't think of at the time, is that gearboxes when cold usually are a little bit stiffer then when warmed up. All is smooth at this point, even after a long test drive.

 

So for now, I will keep an eye on it and go from there.

 

Thanks for everyone's input.

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