Dexter Posted May 7, 2017 Share Posted May 7, 2017 Last year i failed the emissions test part of MOT. Co% was high, sorted that out by changing the oxygen sensor. Also HC was way too high but after replacing a burnt distributor rotor and cap it was back to normal. Last friday for this years MOT i failed the emissions test again, with the exactly same results. I haven't checked anything yet but i'm assuming the same parts are in need of replacing again. Any idea what might be destroying them? Quote Link to comment Share on other sites More sharing options...
KiNK43 Posted May 7, 2017 Share Posted May 7, 2017 Pretty weird. Could it be that the cat is on its last legs. And replacing those parts last year just squeezed it through? Quote Link to comment Share on other sites More sharing options...
Jayhoath83 Posted May 7, 2017 Share Posted May 7, 2017 I had this issue n a new cat sorted it out Quote Link to comment Share on other sites More sharing options...
Dexter Posted May 9, 2017 Author Share Posted May 9, 2017 Hmm feels weird, since it's only 3 years since i replaced the cat. But have to take that into consideration. I'll take a look at the cap & rotor first, just waiting for the weather to get a bit better... it's been snowing again on and off the last two days! Quote Link to comment Share on other sites More sharing options...
KiNK43 Posted May 11, 2017 Share Posted May 11, 2017 Was it a genuine cat? I'm dubious about after market. And obviously a used oem item could also have limited life span. Quote Link to comment Share on other sites More sharing options...
Dexter Posted May 11, 2017 Author Share Posted May 11, 2017 It was an aftermarket one, but manufactured and fitted by Martelius which has been Finland's leading perfomance exhaust company for 30 years. But true, oem is always oem. I still have the original left, so might try fitting that if nothing else works. Quote Link to comment Share on other sites More sharing options...
Dexter Posted May 22, 2017 Author Share Posted May 22, 2017 So i opened the cap, found some residue on the terminals and cleaned them. There was a small burn mark on the rotor so replaced that. Lazy as i was, i cranked the engine by turning the key to get to the rotor screw and ended up breaking the coil, so replaced that as well. When putting things back together, i noticed there was a tiny bit of play in the rotor. Could that be a sign of a distributor bearing etc. giving way? Might explain why last year's problems have resurfaced. Quote Link to comment Share on other sites More sharing options...
Finch Posted May 23, 2017 Share Posted May 23, 2017 Was it a new dizzy or used? If you're replacing dizzys that often there might be something else wrong, I've heard of someone not having their cam caps tightened to correct ft-lb causing vibrations thus causing damage to the dizzy/bearings. Have you done any head work? Quote Link to comment Share on other sites More sharing options...
Dexter Posted May 23, 2017 Author Share Posted May 23, 2017 I haven't replaced the dizzy yet during my ownership of 8 or something years. With last years problems i mean same type of high emissions again, and a slightly worn rotor and residual cap. Last year they were toasted though. The only head work i've done was replacing a leaking cam seal a year ago, but made sure to torque everything down to spec. Quote Link to comment Share on other sites More sharing options...
Dexter Posted July 25, 2017 Author Share Posted July 25, 2017 Turned out that the dizzy axle bearing had indeed come to it's end. Thanks to @10000rpm i got a refurbed distributor in no time, and after fitting it and reseting the ecu i passed emissions with flying colours. Time for a track day me thinks! 4 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.