is my turbo dead?

goldspanners

NickWarren wrote: »

Just for my own curiosity does anyone else think that it sounds like the car put itself in limp mode?

i would have thought limp mode would bring a warning light on the dashboard.

darich

Like some of you, I thought a warning light would have come on.
And that's why I thought it was more mechanical eg turbo, fuel pump or something similar. I also wouldn't have posted with my problem because the car would have told me via the engine management light that there was a problem.

I also know that my own car warning lights come on and stay on until the fault is removed from the ecu memory even the fault is repaired. So I was a bit sceptical about disconnecting the battery fixing it.
But having done it, the car is driving normally again......still with no warning lights on the dashboard.
Whatever caused the car to limp home (safe mode as my mate called it) is not not causing it to limp. But I still need to get the car checked to confirm what caused it and replace whatever component has a fault.

Update will be posted with official diagnosis when I have it.

darich

Car has been into the garage who could find no fault listed using their diagnostic machine. Even better news is that they didn't charge for it!

Garage suggested that because I disconnected the battery, the fault was lost. If it happens again the car should be diagnosed while running in limp mode to see if they can find something. Until then the car will be used as normal.

Nothing to report really!!

vaio

A good result, hopefully it was a one off glitch caused by whatever deity is in charge of making life hard for drivers.

asbokid

vaio wrote: »

A good result, hopefully it was a one off glitch caused by whatever deity is in charge of making life hard for drivers.

In my experience, driving through deep puddles often throws a malfunction code, or two..

In my Mazda, one or both of the lambda sensors, fitted low on the exhaust, is shorted out by the water.

The ECU detects the voltage irregularity from the short, and compensates by disabling all the dynamic sensor samples.

Instead, the ECU switches to a static fuel map table, and that is all you have to limp back to the garage for servicing. Hence the poor running.

Depending on the engine, some malfunction codes are retained in persistent memory, mainly for safety reasons (eg ABS faults). These can only be cleared by using a specialist electronic service tool. Other less crucial codes can be reset by simply disconnecting the battery for a short while.

i drove through an enormous "puddle" in Bewdley, last year, and that triggered half a dozen engine faults, including airbag faults. The lights on the dashboard lit up like it was the Walsall Illuminations!

Magnificent! Walsall Illuminations

cyclonebri1

How is "limp home" or "safe" mode achieved in a diesel?

I'm fully aware how it works on petrol engines, ignition !!!!!!, fueling averaged, revs soft cut etc, but not familiar on diesel, does it cut the fuelling only?

vaio

I’d guess it’s much the same for modern diesels but without anything spark related. Limiting the boost is sure to come into it as well.

darich

vaio wrote: »

I’d guess it’s much the same for modern diesels but without anything spark related. Limiting the boost is sure to come into it as well.

There was no sign of any boost whatsoever when in limp mode. I'm sure the car would have revved to the red line when stationary but taken longer than normal. I doubt if it would have hit the red line under load.
The car was sluggish and slow and the only way to pass 40mph was to find a good hill!!!