Only cranks 1/4 turn after oil change and flush.

[soops]

Hi, I really hope someone can help/

2006 xsara picasso 1.6 hdi.

Put in engine flush as the oil was black as it has had a long interval. Dropped the oil, refilled with 4l.

Started it back up, all was fine. Came back half an hour later and it ran for 2 mins then started to rev so I shut it down.

oil is at it's correct level so not over the top.

now only cranks about half a rev at a time and won't start. For a while there has been an a small patch of oil on the floor but at times recently there has been high oil usage, no smoke(apart from the usual blue puff on monring start, but that's it) but the oil level has dropped a fair bit and needed topping up and sometimes the engine light comes on, but goes off again after a day or so. A couple of weeks ago it had a spell during a journey where it was down on power but it picked back up 15 mins later.

Anyway, took top cover off to look at the cam( as I had a snapped cam on a pug 405 many years ago), that is fine. Pipes off the intercooler and it looks very wet in there, took the sensors out of the throttle body and both were covered in oil. Pipe to the turbo was next and that had some oil in it. The turbo spins but how freely should it be, it moves under light finger pressure but you can't flick it to make it spin on it's own.( I dunno if that is relevant description).

Is there a pipe or breather that is known to get filled with oil and cause a lock? When it was running and the oil filler cap was off it wasn't breathing it sounded nice...until it started to rev.

No water in the oil and the expansion tank is nice and clean.

I'm tempted to drop the dpf next or to see if it is caked in oil or something weird.

Please any clues before I have another look tomorrow?

Thanks

Dave

[wheeler]

Have you tried turning the engine over by hand?
Wehen you added the flush did this take the oil level way too high?
Everything run normally with the flush in?

[Paul-R]

It does sound like a hydraulic lock in one of the cylinders. As Wheeler says, maybe from the flushing oil? Not sure how it could have happened though.

[wheeler]

As Wheeler says, maybe from the flushing oil? Not sure how it could have happened though.

Was thinking along the lines that the engine oil may already been on maximum mark then a bottle of engine flush added makes the engine way overfilled, The excess oil/flush may have then gotten into the intake which caused the revving as running on engine oil now.

[Paul-R]

Put in engine flush as the oil was black as it has had a long interval. Dropped the oil, refilled with 4l.

Yes, it certainy sounds like flushing oil was added to the existing engine oil.

Started it back up, all was fine. Came back half an hour later and it ran for 2 mins then started to rev so I shut it down.

I missed this before. Yes, it looks like the engine had started to burn the engine oil. The OP was lucky to be able to stop the engine at all in such a condition.