Disconnect each sparker in turn and see which one makes no odds, that should help narrow the problem down to one cylinder at least. If you find the culprit then you can try swapping coil packs to see if the problem moves with the coil or not. If it doesn't then it's got to be the injector or maybe a burnt valve although I think that's pretty rare these days.
V5 Misfire
I have a Mk4 150 Golf V5 but it's an estate.. they only made it for one year (99-00) so not many about.
It's got a misfire that is causing a lot of juddering under 2000rpm but is normally gone after a lot of fast hi rev driving. Then it comes back. Compression test came back fine, Lambda sensor is not working, so say the garage. Coil pack was cracked and corroded and sparking all over the place so put new (secondhand) one on. Only a tad better. Due new spark plugs,. AA man seemed to think cylinder 4 was at fault. Had a wet spark plug. No fuel coming from the exhaust so garage thinks at worst it'll be the injector.
But they are struggling to find any real difference in any of the cylinders. Leads have been swapped around and replaced where needed too to eliminate stuff. Anyone got any ideas? If it's a dismantling job i can't afford it but don't want to scrap it as it's other wise perfect.
It's still very drivable but down on power and fuel is likely to be being wasted away with all this hi rev driving.
It's got a misfire that is causing a lot of juddering under 2000rpm but is normally gone after a lot of fast hi rev driving. Then it comes back. Compression test came back fine, Lambda sensor is not working, so say the garage. Coil pack was cracked and corroded and sparking all over the place so put new (secondhand) one on. Only a tad better. Due new spark plugs,. AA man seemed to think cylinder 4 was at fault. Had a wet spark plug. No fuel coming from the exhaust so garage thinks at worst it'll be the injector.
But they are struggling to find any real difference in any of the cylinders. Leads have been swapped around and replaced where needed too to eliminate stuff. Anyone got any ideas? If it's a dismantling job i can't afford it but don't want to scrap it as it's other wise perfect.
It's still very drivable but down on power and fuel is likely to be being wasted away with all this hi rev driving.
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