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The mkiv Supra Owners Club

Complete loss of power


jimmy_supra

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Went out for a drive in the Supra earlier the last one for a while as the tax runs out today. All was well and the turbos were coming online and off as they should. I had just gone up a pretty big hill on a main stretch of road boosting at 1.2bar. Then I reached the top let off and all was still fine until I accelerated again at which point there was no boost. There was no noise no smoke just a sudden lack of power.

 

I pulled over had a good look at all the intercooler pipes and vacuum pipes, they all appear to be fine.

 

There has been a slight whistling noise lately coming from the turbo, could this be related?

 

My only thought at the moment is that the turbo's have given up on me or at least one of them however there was no black smoke or noise to indicate this.

 

Has any one got any ideas?

 

Any help much appreciated

 

Thanks James

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No boost at all I can't remember how to put it into TTC also I have got a Apexi AVCR installed so is it possible to do TTC with that connected?

 

It's easy enough to do, there is the guide on here somewhere, you can do it with an AVCR.

 

Looked in the intercooler and air filter pipe work no sign of oil it's all dry.

 

This has me doubting that the turbo has gone, you will usually get some sort of sign (Noise, Oil, Smoke), they don't tend to just stop after working perfectly fine.

 

By putting the car in TTC and seeing what happens, it will help with diagnosis.

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TTC is to dignose a problem with the 2nd turbo. TTC aint going to make the 1st turbo work again.

 

A simple solution is take the 1st turbos inlet elbow off and turn the engine on and see if its spins and check the fins. (Most common is the exhaust turbine failure)

 

It'll show up a vacuum/VSV error though if there is one.

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Put it into TTC and it's the same. Start to accelerate and there is a noise like the air is being released so I'm thinking the first turbo is definitely broken. The noise I'm guessing is the pressure trying to build and then being released via the easiest path.

 

If you can hear it spooling then it must be working. like above check all hoses from turbo to intake.

Also if you have the tools just take the 1st turbo intake elbow off and have a look

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I had a hose on my fmic that kept popping off and that left the car driving like an NA. Sorted that then a pipe on the boost control had a split in it leaving the car over fuelling and running like an NA.

Like said above. Check all the pipes.

I feared the worse and was pleasantly surprised, but it did take LeeP at SRD to sort it out for me!

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Look at the IC to TB pipe joint down by the side of the battery. In fact don't just LOOK at the damned thing, remove the pipe to chassis clamp, give it some proper tugging and twisting grief, get a light down there, and you'll probably find one of the rubber hoses is partly blown off. If I had a hundred quid for every "I have checked EVERY HOSE, 10 times" story only to find they have done it wearing evening dress, white gloves and with a morbid fear of getting dirty, and a pipe IS off, I'd be a wealthy man :)

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