Diesel Runaway

DjC
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Diesel Runaway

Post by DjC » Thu Nov 23, 2017 5:49 pm

Hi Team
Took my 2006 Golf4 TDI 1.9 for major service (304000 KM, no problems)
Just got told that they had runaway when they put it on DYNO ...Engin Blow up !
I know diesel engine can runaway for various reasons, and there is ways to stop the runaway
Question ? (Please advise)
What is the procedure for runaway on DYNO, and could it be prevented ?
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Re: Diesel Runaway

Post by Jetta2 » Thu Nov 23, 2017 5:53 pm

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Re: Diesel Runaway

Post by Neuk » Thu Nov 23, 2017 6:16 pm

Did you remove the ASR/ASV? Once the car is switched off the ASR/ASV should close the intake and starve the engine of air.
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Re: Diesel Runaway

Post by DieterMK5 » Thu Nov 23, 2017 6:23 pm

Was there any issues regarding smoke from the exhaust? Particularly white


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Re: Diesel Runaway

Post by panic-mechanic » Thu Nov 23, 2017 6:56 pm

why would you run a car on the dyno for a service?.
But it is pretty simple. Switch it off or put your foot on the brake and press the dyno brake. It will drag it dead.
Can't really prevent it, turbo failure causes it.
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Re: Diesel Runaway

Post by missioner » Thu Nov 23, 2017 10:19 pm

Diesel runaway is when the engine continues running after its switched off using its own oil as fuel. If there is excessive blowby from the cylinders or, as Panic mentioned, bad turbo, the hot oil rich air is good enough to fuel a diesel engine. It will simply rev out until it destroys itself. Not to much can be done to stop it once it happens. I bet that there were signs that could have been picked up that could have prevented it, but the cause of the problem came long before the event.
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Re: Diesel Runaway

Post by panic-mechanic » Fri Nov 24, 2017 6:31 am

As I said before the brakes are quite sufficient to stop the runaway. You keep it in gear and stand on the brake till it dies. I have had it twice in that exact same model ie golf 4 tdi and simply dragging it to a stop on the brakes works perfectly fine. That engine does not make more hp ( and it makes even less with the blown turbo) than what the brakes can provide in stopping force. But people panic instead of just thinking and acting properly. So the first thing they do is step on the clutch which it the last thing you should do.
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Re: Diesel Runaway

Post by DjC » Fri Nov 24, 2017 6:59 am

Neuk wrote:Did you remove the ASR/ASV? Once the car is switched off the ASR/ASV should close the intake and starve the engine of air.
No, stock standard no modifications ever done to the car.
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Re: Diesel Runaway

Post by DjC » Fri Nov 24, 2017 7:02 am

Dietermk4 wrote:Was there any issues regarding smoke from the exhaust? Particularly white


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NO, just the normal black smoke when accelerating
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Re: Diesel Runaway

Post by Neuk » Fri Nov 24, 2017 8:17 am

DjC wrote:
Neuk wrote:Did you remove the ASR/ASV? Once the car is switched off the ASR/ASV should close the intake and starve the engine of air.
No, stock standard no modifications ever done to the car.
I would have thought that with the ASR/ASV in place the engine would have been starved of air and die but maybe there are other issues.
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Re: Diesel Runaway

Post by THANAS » Fri Nov 24, 2017 8:45 am

Or it just blew up on the dyno, is there any evidence of a diesel runaway? Also did you ask to have the car Dyno'd?
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Re: Diesel Runaway

Post by Unobeat » Fri Nov 24, 2017 7:28 pm

missioner wrote:Diesel runaway is when the engine continues running after its switched off using its own oil as fuel. If there is excessive blowby from the cylinders or, as Panic mentioned, bad turbo, the hot oil rich air is good enough to fuel a diesel engine. It will simply rev out until it destroys itself. Not to much can be done to stop it once it happens. I bet that there were signs that could have been picked up that could have prevented it, but the cause of the problem came long before the event.
Thanks for the explanation, i was about to ask the question.
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Re: Diesel Runaway

Post by Shadows101Fall » Sun Nov 26, 2017 6:06 pm

Lmao, weird af to put a car on a dyno after a major service, usually you just go drive it in normal operating conditions for a while, but my bet is (due to the mileage ) the turbo seals were reaching their expected life expectancy and fed the engine oil until it ran out of that into catastrophic failure. Bad luck, but I would challenge the service centre on the matter.
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Re: Diesel Runaway

Post by Kavi4GP » Wed Nov 29, 2017 4:01 am

Stuff the intake to starve it , saves drivetrain stress


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Re: Diesel Runaway

Post by panic-mechanic » Wed Nov 29, 2017 7:31 am

My guess is you have never had this happen yet? It happens faster than you can say runaway.. By the time you have brought to a standstill if you put it in neutral and get out to stuuf the intake the motor would have long time grenaded.....
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Re: Diesel Runaway

Post by MrMazda » Wed Nov 29, 2017 7:54 am

The real question still remain, WTF was the car on a dyno? If this happend on a dyno I am right if I say it could / would have happened anytime any where?
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Re: Diesel Runaway

Post by panic-mechanic » Wed Nov 29, 2017 9:45 am

Yes just unfortunate. Dyno don't place more load on a car but you do tend to rev it slightly higher than it might see everyday. Could have just been the unlucky last straw. That they then did not handle the runaway is the really unfortunate bit
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Re: Diesel Runaway

Post by Tdi jetta 4 ever » Thu Nov 30, 2017 11:11 pm

It might be one of those performance service centers then.
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Re: Diesel Runaway

Post by Ivers1 » Sat Aug 11, 2018 12:18 pm

Hi all
Being a qualified mechanic and Master technician we have developed a safety system for run away diesel engines. This was developed for the mining industry where we shut the engine down in this situation. Turbo charger wear is the most common fault on run a way engines. we still produce kits for this application.

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Re: Diesel Runaway

Post by Ashveer03 » Sat Aug 11, 2018 4:45 pm

Keen to see that safety system, can u share any info?

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Re: Diesel Runaway

Post by Tdi jetta 4 ever » Sat Aug 11, 2018 10:34 pm

I had a runaway a few months back. I just switched it off. Luckily my shut off valve still worked.
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Re: Diesel Runaway

Post by VAG Fan » Mon Aug 13, 2018 3:22 pm

Several people in this thread have been asking about the shut-off valve. Agreed, when it operates, it completely shuts off the inlet manifold. But, to my knowledge, it only does so for a second or two, to kill the engine on a normal switch-off. After that, it actually re-opens, ready for the next engine start. You can observe this when switching the AHF off.

So, if a runaway engine was switched off at high revs but is still moving after the valve has closed and re-opened, it would just pick up speed and run away again.

Robin, I presume in your case the engine fortunately came to a complete stand-still before the valve re-opened.
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Re: Diesel Runaway

Post by MarshallGTi » Mon Aug 13, 2018 4:34 pm

I could be wrong, but on the 96kw motors the ASV stays closed until the ecu reads 0rpm. Its not there as a shut off valve, but rather an anti-shudder valve to kill the engine quicker and thus less rocking motion and vibrations for you to feel in the cabin.
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Re: Diesel Runaway

Post by Ashveer03 » Mon Aug 13, 2018 5:24 pm


MarshallGTi wrote:I could be wrong, but on the 96kw motors the ASV stays closed until the ecu reads 0rpm. Its not there as a shut off valve, but rather an anti-shudder valve to kill the engine quicker and thus less rocking motion and vibrations for you to feel in the cabin.
I was thinking along the same lines.. thats the reason its called an anti shudder valve and not an engine shut of valve lol.

A tuner might be able to tell us how the asv works? Whether its linked to rpm or whether its a timed function..
I did notice that whenever u shut off the engine, the asv stays closed for a second or 2 after the engine has shut off

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Re: Diesel Runaway

Post by VAG Fan » Tue Aug 14, 2018 11:13 am

Would the ECU still monitor rpm if the ignition is switched off anyways? Does the ECU even get power?
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