Well after 14 Month's of totally Trouble Free Motoring apart from a Flat Tyre,My Much Loved 54 plate 39000 mile 1.2 HTP Classic has Blotted it's copybook,This Fault has happened Twice once last Saturday in Guildford (we where down in Bracknell and just went for a drive),once today back up here in Walsall,anyway what happen's is pull up at light's EML come's on idle goes really erratic almost total inabliity to rev 2k max rev's,pull away very slowly to a safe spot switch off engine, restart engine run's perfect have driven 350 miles between these instance's 190 ish on motorway's at 70-80mph,only common denominator's on both occasion's engine was at normal operating temp,stationary at light's and roughly 3/4 tank of fuel in car,no fault code's are stored or pending,took car straight to garage today after restarting engine,they said next time it happen's (if it does's) try to get there without switching engine off so EML is still on 

Any Idea's Folk's?

We had one recently that showed a misfire on number 1 cylinder.  Did the usual of a coil pack and swapping fuel injectors about, but we could still see the misfire counter rising on number 1.  After 200 or so misfires, with no discernible change to how the engine was running, the engine light came on and it dropped onto two cylinders.

 

After a cylinder compression test and a cylinder leak down test which showed up number 1 cylinder as not being as good as the other two, we removed the cylinder head to find a cracked exhaust valve on number 1.  Three new exhaust valves later along with new timing chains and sprockets the engine was fine.

 

To make an accurate diagnosis you need to get it read for any codes present, depending on what is found will lead to the next stage in the diagnosis.

We had one recently that showed a misfire on number 1 cylinder.  Did the usual of a coil pack and swapping fuel injectors about, but we could still see the misfire counter rising on number 1.  After 200 or so misfires, with no discernible change to how the engine was running, the engine light came on and it dropped onto two cylinders.

 

After a cylinder compression test and a cylinder leak down test which showed up number 1 cylinder as not being as good as the other two, we removed the cylinder head to find a cracked exhaust valve on number 1.  Three new exhaust valves later along with new timing chains and sprockets the engine was fine.

 

To make an accurate diagnosis you need to get it read for any codes present, depending on what is found will lead to the next stage in the diagnosis.

no fault code's present or stored 

Afraid to say it but sounds very similar to an issue I had some time ago. Here's the thread http://www.briskoda.net/forums/index.php?/topic/231721-Cylinder-2-misfire-any-one-have-an-idea-of-what-to-check-next?

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Ps I found no fault code would be found unless I carried on driving for a little while with the eml on.

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Afraid to say it but sounds very similar to an issue I had some time ago. Here's the thread http://www.briskoda.net/forums/index.php?/topic/231721-Cylinder-2-misfire-any-one-have-an-idea-of-what-to-check-next?

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can i be really cheeky and ask how much it cost to fix as i reckon mine is only worth £1500 top's in px,and i don't have the spare money to be throwing money at it,so if your's cost more than say £800 to fix i will unfortunatley be forced into changing mine, as i don't wanna be throwing good money after bad i need a reliable car as i work weird shift's,the public transport system is crap round here so i need a car 

It cost a little over £500 by a Skoda specialist. Not much given the extent of the work that was done. In my case it was well worth it given the low milage of the car. But the reality is having the head stripped and rebuilt is pritty much worst case scenario, it could very well be that your issue is much simpler. Best to work through fault finding checks till you track the issue.

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Edited 21 September, 201312 yr by Ben Cordy

no fault code's present or stored 

 

 

There wasn't on the example that I gave above, until the ECU disabled the cylinder.  The give away was looking at the misfire counter in the measuring blocks, though the engine appeared to be running smoothly the misfires on number 1 were clocking up at quite a quick rate.

 

If the rest of the car is good, it may make sense to get it repaired, otherwise in replacing it you may buy someone elses problem car, which could be the case for the next owner of your car.