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Old July 9th, 2017, 19:27   #1
Mocontreras
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Default Engine revved by itself after hard acceleration

Took our 2003 jetta 1.9 tdi out and after a hard acceleration the engine revved really high on it's own until it died. It took a bit to get it started back up, but we were able to drive it the mile home. It seemed to run fine the rest of the way home. The next day my gf noticed it was smoking so she parked it. I took it for a ride after work and noticed a whitish grey smoke. It seemed to have lost power. I took it back home and parked it. I pulled the glow plugs and the number 2 and 3 seemed to be burnt. I replaced them and it still smokes pretty bad. I checked to turbo on the air side and it spins freely with no play. I'm at a loss and live on an island with no vw mechanic. Please help.
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Old July 9th, 2017, 19:53   #2
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My thinking is that there was oil built up in the intercooler and the hard acceleration caused it to be carried into the intake tract to be ingested by the engine thereby causing somewhat of a runaway condition. The possibility exists that the lingering smoke may be caused by residual oil still being ingested by the engine. May also be that you have some bent rods from the engine trying to compress a fluid that cannot be compressed. Are you able to run a compression check?
What did your turbo look like when you checked? Oil seals intact?

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Old July 10th, 2017, 06:44   #3
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You need to get a compression test done, it will tell you you most likely bent cylinder 2 and/or 3 rods, unfortunate.
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Old July 11th, 2017, 16:33   #4
Mocontreras
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The turbo had a white discolored fin on it. I ordered a compression tester for it and I'm just waiting until that gets here. I hope it's just the turbo
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Old July 13th, 2017, 10:22   #5
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If it runs better when warmed up then it's most likely bent rods. Lowered compression means less combustion (white smoke); it's made worse when the engine is cold (when cylinder temps are low).
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Old August 11th, 2017, 12:21   #6
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Still no compression tester. The exhaust really smells of unburnt fuel. Hopefully compression tester will be here in the next day or 2. How can you find out of its a bent rod or bad valve?
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Old August 11th, 2017, 12:56   #7
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Look at them, either pull the oil pan or pull the head and measure protrusion (best). It sounds like you've had a bit of hydrolock (always bad) when it ingested the stuff in the piping. Turbo might be O.K, but engine likely suffered damage.
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Old August 11th, 2017, 13:04   #8
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Did you check your oil level?
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Old August 11th, 2017, 13:21   #9
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Oil level seemed fine. The turbo also seems to be ok. I can't really pull the head. I don't have a garage to park the cat and if it turns out to be a bent rod. I don't have the expertise to take car of that. I live on a remote island and would have to toe the car onto a ferry and then tow it to a shop. Is there any easy way to get a good idea of what's going on?
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Old August 11th, 2017, 13:35   #10
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Quote:
Originally Posted by Mocontreras View Post
Oil level seemed fine. The turbo also seems to be ok. I can't really pull the head. I don't have a garage to park the cat and if it turns out to be a bent rod. I don't have the expertise to take car of that. I live on a remote island and would have to toe the car onto a ferry and then tow it to a shop. Is there any easy way to get a good idea of what's going on?
Oil level good is a good sign, means it didn't get much, just the 1/4 cup or whatever that collects in the piping. Easiest first step is compression check.
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Old August 11th, 2017, 13:55   #11
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I'm new to the diesel world. I'm not sure what a hydrolock is
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Old August 11th, 2017, 14:20   #12
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Quote:
Originally Posted by Mocontreras View Post
I'm new to the diesel world. I'm not sure what a hydrolock is
When you take in more liquid than you should into the combustion chamber and it cant be compressed anymore, it bends components(typically the connecting rod as its the weakest link).
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Old August 13th, 2017, 01:12   #13
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To be more precise, hydro-lock is the condition in which mechanical motion is stopped/impeded* due to a fluid obstruction. Oil, water, and even fuel in too high of a quantity in the combustion chamber that impedes the full compression stroke of the rod+piston will result in a hydrolock condition. Combustion chamber on these engines is pretty small, doesn't take a lot of excess fluids to get into trouble.

* It's possible that the engine's rotation isn't totally stopped, that the rod gets bent just a little, enough to give some "relief" to accommodate the mildly excessive fluids (which can then manage to get pushed out the exhaust valve). No matter how much the rod gets bent the compression test will almost always tell you whether an engine encountered a hydrolock condition.
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Old August 13th, 2017, 17:32   #14
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Thanks. I've finally got my compression tester. I'm going to try and get it done tomorrow. Any tips on doing the compression test? The tester I have used the glow plug hole.
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Old August 13th, 2017, 18:33   #15
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Please make sure it's for a diesel and not the gas version.......the gas version pressures are lower than the diesel version.
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