oil and fuel contamination

[estie]

Was told at a recent service that remapp was causing car to over fuel. The evidence was in the fact the "oil had a smell of petrol"

Run car through diagnostics and all came back fine.

Through many phone calls and conversing with many different people I have come to the conclusions that:

no mechanical fault can cause petrol to leak or get into the oil.

If such a fault did occur warning lights or at least a fault would be recognised on diagnostics

over fueling would cause a high engine temperture

pops and bangs out the back

a sluggish drive and unresponsive throttle


OF WHICH I HAD NONE....

so what is causing the smell in the oil...

all my short trips are balance out by a healthy run and regular "stretch her leg drives"

over fuelling...diagnostics say all is fine.

Or could it be...V-power fuel and high octane and additive fuel. I have been told that this fuel can be the cause and most likely is the reason for the smell in most modern cars.

any ideas??

 

[Nath.]

no mechanical fault can cause petrol to leak or get into the oil.

Disagree.



Worn or failed piston rings can cause fuel to get into the oil, so can very high levels of boost as the charged air and fuel blows past the rings.

Get a compression test done.

 

[estie]

no mechanical fault can cause petrol to leak or get into the oil.

Disagree.



Worn or failed piston rings can cause fuel to get into the oil, so can very high levels of boost as the charged air and fuel blows past the rings.

Get a compression test done.

would that not show up on a diagnostics?

 

[Nath.]

Nope, but it would show up if you have a compression test done.

If it's piston rings it will be ££££.

There is obviously fuel in the oil because it smells of petrol, the only thing that I can think of that seperates the compressed fuel and air in the cylinders from the engine oil is the piston rings.

 

[estie]

Nope, but it would show up if you have a compression test done.

If it's piston rings it will be ££££.

well I hope its not, no one has suggested compression test. car is only 1 year old.

 

[Nath.]

well I hope its not, no one has suggested compression test. car is only 1 year old.

Get the map off and get it to a dealer under Warranty and tell them that you think your oil smells of petrol. They can do a compression test and a test that shows up petrol or diesel in the oil. I think they check for co2 "exhaust gasses" in the oil. ( I forget the name of this test but someone will be along in a minute to help)

 

[Nath.]

Just had a thougt and your problem could also be a failed head gasket but IMO most probably rings.

Just had another thought and IIRC the fuel pump on the 2.0T is cam driven so it may be possible that it's a faulty fuel pump too.

 

[DanGB]

My cars buring oil massively, so all eyes are pointing to damaged piston ring. getting it looked at soon.

 

[Tam]

My cars buring oil massively, so all eyes are pointing to damaged piston ring. getting it looked at soon.

but its also running 450 ish bhp

 

[DanGB]

only 390 at the moment

 

[OLDOILER]

Was told at a recent service that remapp was causing car to over fuel. The evidence was in the fact the "oil had a smell of petrol"

Run car through diagnostics and all came back fine.

Through many phone calls and conversing with many different people I have come to the conclusions that:

no mechanical fault can cause petrol to leak or get into the oil.

If such a fault did occur warning lights or at least a fault would be recognised on diagnostics

over fueling would cause a high engine temperture

pops and bangs out the back

a sluggish drive and unresponsive throttle


OF WHICH I HAD NONE....

so what is causing the smell in the oil...

all my short trips are balance out by a healthy run and regular "stretch her leg drives"

over fuelling...diagnostics say all is fine.

Or could it be...V-power fuel and high octane and additive fuel. I have been told that this fuel can be the cause and most likely is the reason for the smell in most modern cars.

any ideas??

I seem to remember that SEAT/VAG Maque had a problem with engine/pump seal interface that could let fuel into the engine?? but that was on early plated Leons 1P. ........................................ co's it could aways be that during build it was poorly assembled and resulted in the same fault - just try and prove it though [ Retired warranty engineer weapons]

 

[DanGB]

I seem to remember that SEAT/VAG Maque had a problem with engine/pump seal interface that could let fuel into the engine?? but that was on early plated Leons 1P. ........................................ co's it could aways be that during build it was poorly assembled and resulted in the same fault - just try and prove it though [ Retired warranty engineer weapons]

Tell me more, im interested..

 

[estie]

you would think that with all the technology we have an engine management light would come up or a diagnostics test would show something. When I rang up and asked another seat dealer the technician said that the high octance fuel causes the smell, he says his golf is the same. What you think, chatting rubbish??
Asked the people that run the diagnostics if anything would show up, and they said they ran it from all the sensors and something would show.
I jus want some proper answers!
Will have to get the compression test run. praying not piston rings.
Really worried now

 

[robdf2]

missing the obvious .....................
fuel pump , oil and fuel can mix here from worn or damaged o rings
i would look here myself.

 

[estie]

missing the obvious .....................
fuel pump , oil and fuel can mix here from worn or damaged o rings
i would look here myself.

you think a fault code would exist for that though?

 

[estie]

also something i missed out, when the first service technician said bout fuel in the oil he said "its not mechanical its just overfuelling because of the remapp"

 

[robdf2]

but surely if your car was overfuelling then the fuel would just burn up , your car will have loads of detonation symptoms and bad starting followed by bad running and heavy fuel consumption , i dont see how it could just get intot the oil?

now this next bit is not on your car but if you change the internals on a standard fuel pump and they are not assembled properly then petrol can be contaminated with oil.

have you had an oil change to see if there is fuel in your oil?

 

[estie]

I went to have an anual service done, the service technician said the oil smells of petrol. I asked them not to plug the car into their system as it would cause the remap to be lost.
The technician said the car is over fuelling and that is it, I asked could it be mechanical and then he began to get irrate saying "no its the remap, its the remp this yaddy yaddy yada" get it taken off and bring it back for diagnostics.

I took the car to AmD essex and asked for a diagnostics they took the car for a run and everything came back fine, and their general view is the car is "fine"

i rang seat back and said a diagnostics has been run and everything came back normal. so if i bring it to you without the remap on the diagnositc will come back normal and you will say its the remap. despit everything being fine. So I asked is it 100% not mechanical, I was responded with "its the remap your engine is going to blow up"

So I rang another seat dealer and asked their opinion, the guy said if I was over fuelling "I WOULD KNOW ABOUT IT" with too many tell tale signs to possibly list. He said a fault code would have been stored some where about something not directly fuel related but maybe to do with pressure dropping or something.
he then went on to ask why I thought it was mixing, before letting me speak he said
"is it because it smells of petrol"
"yes"
" do you use high octan or v power"
"yes everytime"
"ahhh thats what it is, I have a golf gti and its the same, the oil stinks of fuel. I would honestly not worry."

but I am worried!

 

[robdf2]

your map can only dissapear if they update your ecu , not by diagnostic equipment being plugged in.

hmmmm well i use v power all the time , on 27k now and it does not smell of petrol.

so striaght after your service when they did your oil change does it smell of petrol?

if amd have done diagnostics did they check your fuel system?
in their opinion was it over fuelling?

 

[estie]

your map can only dissapear if they update your ecu , not by diagnostic equipment being plugged in.

hmmmm well i use v power all the time , on 27k now and it does not smell of petrol.

so striaght after your service when they did your oil change does it smell of petrol?

if amd have done diagnostics did they check your fuel system?
in their opinion was it over fuelling?

amd says the car is fine. the oil cap still smells of petrol and they changed the oil. I have only done 5000 in the car also.
only driven about 15 - 10 miles since service.