Help with missfire / oil cap popping off

[chrism_rst]

My S2 was running ok lastnight until i took went for a run on the motorway. When i came off the car seemed like it was running on 3 cylinders. I pulled over straight away and when i poped the bonnet the oil cap had come off. I let it cool down checked the oil and that was ok but now evertime i start the car it sounds like its on 3 cylinders and it pops the oil cap off. Does anybody know why this could be. Any help is much appriciated Thanks Chris

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[jaiscossie]

Sounds to me like it could be time for a rebuild mate, piston rings could be worn which causes the cap to pop off.Really you need to get a leakage & compression test, leakage normally tells a lot more than compression

[james kiely]

as above your rings are fooked mate

[chrism_rst]

I thought so hopefully get it tested today. How much would i roughly be talking to get it rebuilt back to standard? Thanks for the help.

[m4ttyrs]

The top post is very breif chris. Rather than "went for a run on the motorway" why dont you tell everybody what really happend. Ok so i will tell it as you. Last nite at about 1am when an m3 tried to come past me i thought f~#* that and gunned the rst, the m3 slowly started creeping backwards and me and my 2 mates were laffing our heads off, i then hit the rev limiter in 4th which let out a massive flame and a bang which is always good for the engine and looks really cool. Then with the sound of my mates shouting KEEP IT PINNED! into 5th i went and gunned it again still laffing and still pulling away from the m3. I didnt shut off untill the car was off the clock and the slip road was approaching the m3 was a dot in the distance which is when i discovered that the car wasnt running at its best and that 150mph run mite have done some damage so i pulled off to a side road to try and work out what could possibly be wrong. I came to the conclusion that 150mph combined with the fact that the car has been stood in the garage for 6 months and this was its first run out mite all be contributing factors. I think this is much more in detail Chris. All on a private test track obviously. ZVH time mate.

[StephenC]

Originally Posted by m4ttyrs

The top post is very breif chris. Rather than "went for a run on the motorway" why dont you tell everybody what really happend. Ok so i will tell it as you. Last nite at about 1am when an m3 tried to come past me i thought f~#* that and gunned the rst, the m3 slowly started creeping backwards and me and my 2 mates were laffing our heads off, i then hit the rev limiter in 4th which let out a massive flame and a bang which is always good for the engine and looks really cool. Then with the sound of my mates shouting KEEP IT PINNED! into 5th i went and gunned it again still laffing and still pulling away from the m3. I didnt shut off untill the car was off the clock and the slip road was approaching the m3 was a dot in the distance which is when i discovered that the car wasnt running at its best and that 150mph run mite have done some damage so i pulled off to a side road to try and work out what could possibly be wrong. I came to the conclusion that 150mph combined with the fact that the car has been stood in the garage for 6 months and this was its first run out mite all be contributing factors. I think this is much more in detail Chris. All on a private test track obviously. ZVH time mate.

love it

[10th_racer]

Originally Posted by m4ttyrs

The top post is very breif chris. Rather than "went for a run on the motorway" why dont you tell everybody what really happend. Ok so i will tell it as you. Last nite at about 1am when an m3 tried to come past me i thought f~#* that and gunned the rst, the m3 slowly started creeping backwards and me and my 2 mates were laffing our heads off, i then hit the rev limiter in 4th which let out a massive flame and a bang which is always good for the engine and looks really cool. Then with the sound of my mates shouting KEEP IT PINNED! into 5th i went and gunned it again still laffing and still pulling away from the m3. I didnt shut off untill the car was off the clock and the slip road was approaching the m3 was a dot in the distance which is when i discovered that the car wasnt running at its best and that 150mph run mite have done some damage so i pulled off to a side road to try and work out what could possibly be wrong. I came to the conclusion that 150mph combined with the fact that the car has been stood in the garage for 6 months and this was its first run out mite all be contributing factors. I think this is much more in detail Chris. All on a private test track obviously. ZVH time mate.

sounds like it was worth while to me lol

i'v done this a few times, when mine was stripped and inspected closer on 2 occasions it had cracked a piston, and the other 2 occasions it had melted a piston, all due to running weak, the pressure then coming back up through the head is what blows the oil cap off.

[jonny s2]

Originally Posted by m4ttyrs

The top post is very breif chris. Rather than "went for a run on the motorway" why dont you tell everybody what really happend. Ok so i will tell it as you. Last nite at about 1am when an m3 tried to come past me i thought f~#* that and gunned the rst, the m3 slowly started creeping backwards and me and my 2 mates were laffing our heads off, i then hit the rev limiter in 4th which let out a massive flame and a bang which is always good for the engine and looks really cool. Then with the sound of my mates shouting KEEP IT PINNED! into 5th i went and gunned it again still laffing and still pulling away from the m3. I didnt shut off untill the car was off the clock and the slip road was approaching the m3 was a dot in the distance which is when i discovered that the car wasnt running at its best and that 150mph run mite have done some damage so i pulled off to a side road to try and work out what could possibly be wrong. I came to the conclusion that 150mph combined with the fact that the car has been stood in the garage for 6 months and this was its first run out mite all be contributing factors. I think this is much more in detail Chris. All on a private test track obviously. ZVH time mate.

sounds like engine time