Bommaboi

Hi I have the above car 1.8 turbo c250 cgi,
I recently changed the oil as it appeared I'd slight over filled on my last change.. Not a mistake I make. And changed oil etc 2 weeks ago and put 5.5 litres in leaving it bang on between min and max on the dipstick.
I checked it again yesterday and the level is just over max again and it appears petrol is getting in the oil.
I do have the problem of lots of small journeys and understand that the most likely cause it an injector stuck open and there isn't many options for fuel to get there.. But this is not a good scenario at all.
The car does run fine, doesn't misfire etc but I'm now not going to use it till I can sort this out.
Has anyone had this problem and what was their result as the more info the better.

Thanks

dol4er

Is it possible that you fill the oil cold and when the oil gets hot, its level raises?

Bommaboi

No this is not possible, the car was filled cold, and rechecked while cold and standing in the same place so not some like ground level etc either.. I wish it was that simple.
Even if it had of been hot you would not expect a level half way between min and max to go over max on the the dipstick. You can smell the fuel on the dipstick.

alecmascot

No solution here :http://tinyurl.com/ya7x64sg
But it might give you a starting point.

Bommaboi

Thanks I have read that link, as you say there is no solution there but I will say my car does not have any running issues, maybe that I have caught the problem early.
I'm probably going to check the pressure on the injector rail, if that seems OK I'll be removing the injectors and taking them to an engine specialist company who can test them for any faults.
It's quite an uncommon problem since fuel injection came in. But I was keen to find out if anyone else has knowledge on the problem. I love the car and obviously do not want to damage the engine.

Knightmare69

Actually I have the same issue with my 2010 c200 cgi. Through my oil lab testing, I was always 0.8% petrol in my oil but this last test showed a spike to 1.x% which we're not sure of the cause. One theory is because I ran fuel injector cleaner prior to my oil change that it's the reason for the spike. I won't know until my next oil change when I send the current oil for testing. Hope you figure yours out, might give me insight to mine.

I should also mention my car is tuned and it's possible I'm running a richer than normal map.

Just204

I would start with a compression test, if 10% off normal compression PSI I would then do a leak down test. Could be the piston rings not sealing among other things. You say you do short trips with it? is the car warmed up before driving? Driving a turbo car cold is horrible for it.

bop11

You probably have leaky injectors. When you shut off the engine, the fuel in the high pressure line leaks out of the injector into the manifold and into a cylinder with an open intake valve. This happens every time you shut down the engine. It also happens when you turn on the ignition before starting the car because the fuel pump will try to pressurize the rail to about 40 psi and some of this will blow fuel by a leaky injector. So lots of short trip make the problem worse. Try changing out the injectors. Have you ever replaced the injectors? They are fairly cheap $25 rebuilt, $55 new.

alecmascot

On CGI engines (stratified Charged Gasoline Injection), the fuel rail is at about 120bar and I would imagine the the injector price runs about the same as a diesel engine, around $300.