All Things Mk5 > How to Guides / Troubleshooting
Problem with the S3, strange.. Help would be great!
jonnyc:
--- Quote from: illyun on July 21, 2009, 09:34:51 pm ---Hope you get it sorted Jonny... surely the seller must have known about the fault :fighting: At least its still under warranty.
Sorry couldn't be of any help though :chicken:
--- End quote ---
Thanks mate..
Got the borescope going in tomorrow to have a look around.. If thats inconclusive then a cylinder leak down test.. Then its going to be head off, as im pretty sure there is no/not enough compression on cylinder one..
Im really hoping that its a sticky valve, but that would be easy and relatively cheap to fix.. So its probably a melted piston and a score block.. ARRRGGHHHH...
iainalpine:
Jonny, if you could get your hands on an Oscilloscope you could scope the primary winding of the ignition coil. This will tell you alot about whats going on. A large induced voltage shown on the screen will confirm that your getting good compression and that the coil is doing its job (the higher the compression the more voltage thats induced). also from this you can see the spark duration, switched earth from the ecu and main feed for the coil. I dont think that it will be the main feed for the coil as they all share the same feed.
All this aside, a coolant temp sensor will make the car turn over more on crank and on some cases cause a missfire. Check out the voltage going to this (should be 5v) at the plug (unplugged from sensor) and plugged in with ambient temp around 20'c' a voltage of around 3.6v.
Hope you get to the bottom of it.
Iain
jonnyc:
--- Quote from: iainalpine on July 22, 2009, 07:43:12 am ---Jonny, if you could get your hands on an Oscilloscope you could scope the primary winding of the ignition coil. This will tell you alot about whats going on. A large induced voltage shown on the screen will confirm that your getting good compression and that the coil is doing its job (the higher the compression the more voltage thats induced). also from this you can see the spark duration, switched earth from the ecu and main feed for the coil. I dont think that it will be the main feed for the coil as they all share the same feed.
All this aside, a coolant temp sensor will make the car turn over more on crank and on some cases cause a missfire. Check out the voltage going to this (should be 5v) at the plug (unplugged from sensor) and plugged in with ambient temp around 20'c' a voltage of around 3.6v.
Hope you get to the bottom of it.
Iain
--- End quote ---
Thanks for that.. I now know what it is.. Unfortunately a large hole in no.1 piston.. So that would explain it, its what I first thought but didnt want to believe it really! Now the head needs to come off to check for damage to the bore, if thats ok then its just a case of building the engine, if its scored, then it means a new block! Not good news..
The thing is now I need to know why it has this problem and what has caused it as I cant have this happen again!
MAT ED30:
bollox mate thats not good :sad1: could it have been lack of oil as i bet it would use lots of the stuff and has the last owner looked after the car?
gazbutS3:
Thats a bit of an @rse Jonny, its strange that bigandy's was cylinder 1 too, I wonder if theres something in it or just a coincidence :sad1:
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