Nevalenko
15-07-2015, 06:51 PM
Hi all.
Earlier this his year I bought my first VW for my girlfriend, a '98 polo 6n1. Great car. I've come across a bit of a problem though. A few weeks ago I noticed it was running a bit rough. After inspection I've discovered it's missing on cylinder number 1. I've done a fair few tests, like checking the plug leads, all ok. Changed plugs around, still missing on number 1. Changed injectors around, still missing cylinder 1. I've changed the coil to no avail. Then a compression test, that showed nothing, all ok. Then sprayed brake cleaner around looking for intake vacuum leaks but nothing, also cleaned the throttle body. After coming to a dead end I took it to VW in Fairfield to be a analysed. They must have run al the tests, said it was only showing "misfiring code" whatever that means, I didn't need a computer to tell me that! They also put a valve cleaner through it but still missing on number 1. They suspect it's got build up on the valves so need the cylinder head off. I'm not so sure.
The symptoms are - it idles rough and I can remove the electrical connector to injector 1 with no change, then I I slowly increase revs the miss goes away, between 1500-1800 revs, then it comes back again at idle. Sometimes when I drive it on the open road I feel it miss a bit but otherwise it's ok at revs. Anyone got any ideas to check next? Any tips appreciated. Ta.
Earlier this his year I bought my first VW for my girlfriend, a '98 polo 6n1. Great car. I've come across a bit of a problem though. A few weeks ago I noticed it was running a bit rough. After inspection I've discovered it's missing on cylinder number 1. I've done a fair few tests, like checking the plug leads, all ok. Changed plugs around, still missing on number 1. Changed injectors around, still missing cylinder 1. I've changed the coil to no avail. Then a compression test, that showed nothing, all ok. Then sprayed brake cleaner around looking for intake vacuum leaks but nothing, also cleaned the throttle body. After coming to a dead end I took it to VW in Fairfield to be a analysed. They must have run al the tests, said it was only showing "misfiring code" whatever that means, I didn't need a computer to tell me that! They also put a valve cleaner through it but still missing on number 1. They suspect it's got build up on the valves so need the cylinder head off. I'm not so sure.
The symptoms are - it idles rough and I can remove the electrical connector to injector 1 with no change, then I I slowly increase revs the miss goes away, between 1500-1800 revs, then it comes back again at idle. Sometimes when I drive it on the open road I feel it miss a bit but otherwise it's ok at revs. Anyone got any ideas to check next? Any tips appreciated. Ta.