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    Thread: Curious case of an Octavia.

    1. #1

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      parth.jain's Avatar
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      Exclamation Curious case of an Octavia.

      We had a terrible experience with our Octavia 1.9 TDi once, bought in 2006(new) now sold.

      The car never gave us any problems untill 2009 monsoon, when during some water logging in the gurgaon region, our driver drove at moderate speed in a water logged area and unfortunately, the engine ceased. I admit it was mistake on our part.
      Then the engine was overhauled in the company workshop and it looked all fine. But the problems started after the repairs was done.

      When we got our car back, we noticed that there was tremendous decrease in power. The car won't at all pick up speeds, and won't go beyond 100-120kmph. We asked the ASS about it, but they replied that it will be fine after some time. But it didn't.

      After some months, my dad was revving the car while idling(upto 3.5-4k rpm), after driving the car for sometime(as the battery was giving some problems and he believes high revving can charge the battery) and suddenly the car went insane! The rpm automatically crossed the red line . My dad took his foot off the accelerator, and he even switched off the ignition and took out the key but the rpm won't come down! The car was like this for around 10 seconds, and there was all black smoke behind car. We were all quite scared by this kind of behavior, and if this had been while the car was in motion on the road, it could have been a disaster!

      A inspection was made the next day, by the company workshop and by our trusted mechanic. The ASS said that the turbo has failed and it needed to be changed. Our mechanic said that there is something wrong with the turbo. He said luckily there is no damage to the engine, and generally the pistons are melted in such a case! He said there is no need to change the whole turbo, and some valves can be changed and it will be fine. So the valves were changed. After that the car ran perfectly fine, and the power of the car was also back!

      A few years down the line, it was 2011, I got my driving license by now!
      One day I was driving in the night, it was around 11:00 pm, on NH-8, the roads were deserted and I was doing around 100kmph @ around 3.5k rpm in third gear. I was just about to upshift and then suddenly the same thing happened!! The rpm crossed the red line!

      I was quite frightened as the car was completely out of control, I only know how I managed it! The rpm crossed the red line, the speed was increasing and luckily I didn't loose my mind and didn't switch the ignition off. If I had switched off the ignition, the vacuum system would have switched off so the brakes. And the power steering too. I safely took the car on the left most lane, and stopped it.
      After a few minutes, when I got my senses back, I inspected the car. There was a mild burning smell ( like the clutch has burnt) and the clutch pedal was fully depressed! I lifted it back by hand, and tried to start the car after a while. The clutch was working ok after that,though a bit hard and gears were not at all smooth. The engine won't start, though it was taking the self.

      Luckily I was on the decline of a flyover, So I slotted the gear lever to neutral, the car started moving forwards and after gaining some momentum I slotted the second gear, and it started But the engine was misfiring and was vibrating a lot and I had to cover a good distance to reach my home, so I called a tow truck. The car was taken to our mechanic next day, actually he drove the vehicle from the house to his work shop ( a good 15kms) by himself.

      After further inspection, it was revealed that the clutch was burnt, the turbo had blown and 2 of the pistons were melted!!!

      A few days and a lot of money down the line the car came back, and was in running condition. Though the power of the car had decreased a lot, I give the credit of decreased power to the non-company workshop treatment to the car and the second by-pass surgery of the car. It was acceptable.

      But what not at all acceptable was this kind of behaviour of the car!! This type of incident could have claimed lives, and it had been on a busy road, the damage could have been unimaginable.

      The purpose of posting this case here is that I wanted to ask the fellow Gearheads, if it is common in Octavias or diesel vehiclew or was it just my car. What else could have been wrong? I admit that the diesel vehicles are not supposed to be revved upto these rpms, but there should have been a rev limiter if such a incident can happen. I have seen some other diesel vehicles bieng revved upto the highest rpm, with no issues.

      Regards,
      Parth Jain


      PS: I do not intend to insult Skoda Auto by anyway, I am just posting a query as to why this happened and what was wrong with the car. None of the above incidents are fictional and are true. The car was sold in 2013 after it was showing some further problems.
      This is my first thread on the forum, please provide me with suggestions.
      Last edited by parth.jain; 24th Jun 2013 at 03:35.

    2. #2

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      What you experienced is a runaway diesel. This happens mostly to high mileage diesel engines and engines normally self destruct. If the turbo seal leaks, oil will be pumped into the intake manifold and feeds the engine. Diesels will run on motor oil as fuel. The best way to stop the engine will be to shift to 5th gear and apply the brakes but your car should have a anti-shudder valve that blocks the intake manifold when you switch off the ignition. VAG fitted these valves from 2000 onwards.
      You will see this as a plastic or metal rod on the EGR-valve. You can check and see if its connected.
      Another possibility is that your EGR valve was so coked up that the valve was stuck in the open position.
      With runaway diesels nothing melts but things break up. I saw one Toyota reving and grabbed a crowbar from my truck to rip off the plastic intake tube but the owner stopped me as it could damage his car. After a few minutes metal pieces were coming out of the exhaust before destructing itself.
      Last edited by Indian; 24th Jun 2013 at 04:15.

    3. #3

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      You are giving me the creeps. What is a runaway diesel? I thought a failure of part can happen and consequently related things might get damaged. But a mind of its own...

    4. #4
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      Quote Originally Posted by megazoid View Post
      You are giving me the creeps. What is a runaway diesel? I thought a failure of part can happen and consequently related things might get damaged. But a mind of its own...
      It's not a phenomenon that happens often. In 28yrs this is just the 2nd occasion I am hearing of this.

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    5. #5

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      Thank you for the replies!
      Quote Originally Posted by Indian View Post
      Another possibility is that your EGR valve was so coked up that the valve was stuck in the open position
      Thank you sir! By anyway is this related with throttle body? A workshop told me this can also happen because of throttle body being not cleaned time to time!


      Quote Originally Posted by mclaren1885 View Post
      It's not a phenomenon that happens often. In 28yrs this is just the 2nd occasion I am hearing of this.
      Thankyou! Very helpful link

      From this link I learnt that it is common only with VW group engines and this thing can prove catostrphic! Even I heard somewhere that there is a design problem with the VW group turbos. I seriously think VW group should do something about this runaway phenomenon, or the we customers should runaway from them if we want to save our lives(just kdding)



      On a serious note, though it very rare but indeed there should be a mention in the manual about it! Or atleast a warning sticker or something then could keep the driver alert. I am just wondering how catostrophic it will be if this happens to a new driver on a busy road!
      Last edited by parth.jain; 24th Jun 2013 at 12:41.

    6. #6

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      Quote Originally Posted by megazoid View Post
      You are giving me the creeps. What is a runaway diesel? I thought a failure of part can happen and consequently related things might get damaged. But a mind of its own...
      This is nothing to worry about. In all my years with cars and engines as a hobby, I have seen only one case and this I saw as I was driving. Its more scary to think about badly maintained trucks with reckless drivers if the diesel engine runs away.
      One way to check for oil is the intercooler. If there is lots of oil inside, there is something wrong or starting to go wrong though I never do this

    7. #7

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      Quote Originally Posted by parth.jain View Post
      From this link I learnt that it is common only with VW group engines and this thing can prove catostrphic! Even I heard somewhere that there is a design problem with the VW group turbos.
      This can happen to any diesel engine. Cars from the vAG group uses KKK or the Garrett like most German cars. I have never heard of design faults with these turbos. Search for 'runaway diesels' in youtube.

    8. #8

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      Quote Originally Posted by Indian View Post
      This can happen to any diesel engine.
      Ohh got it!

      Can you point out what can be reasons for a runaway, I mean what factors during maintenance/servicing can contribute to the the runaway of a deisel engine.
      My car got a routine service (oil change) the same day of the second runaway!

      Thanks
      Last edited by parth.jain; 24th Jun 2013 at 19:24.

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      I send my car in regularly to keep my mobility guarantee alive and last time at the 225,000 service at 200,000 and they changed my timing belts and checked the whole car and even the turbo pressure. If my car breaks down it will cost them a bit as they have to pay for my hotel while the car is being fixed or give me a rental car as part of their mobility guarantee.
      An oil change is not routine service. At a routine service they do much more than changing oil.

    10. #10
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      Quote Originally Posted by megazoid View Post
      What is a runaway diesel?
      you / tadukuttan driving a diesel.

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