TonyZman129 Posted November 25, 2012 Share Posted November 25, 2012 (edited) My 2004 Z has just failed its mot on emissions by 0.04 on LAMBDA reading. Only done 53K. The garage changed the middle secion of exhaust as it had a blow / corrosion at the join. Was expecting a successful re-test but still failed. Garage now just guessing..could be this could be that all adding up to be the most expensive mot I've ever had..any ideas how to bring reading down or what could be? Edited November 25, 2012 by TonyZman129 Quote Link to comment Share on other sites More sharing options...
Wookiee22 Posted November 25, 2012 Share Posted November 25, 2012 Is the exhaust all OEM? Quote Link to comment Share on other sites More sharing options...
glrnet Posted November 25, 2012 Share Posted November 25, 2012 hopefully one of the technical traders will be along soon, be nice if you introduced yourself properly too in the introductions section 1 Quote Link to comment Share on other sites More sharing options...
ddcboyle Posted November 25, 2012 Share Posted November 25, 2012 If you bought car 2nd hand, dcat or high flow pipes? A hole somewhere else ion exhaust? 1 Quote Link to comment Share on other sites More sharing options...
Vik54 Posted November 25, 2012 Share Posted November 25, 2012 Stick a fuel cleaner in and take her for a blast down the motorway in fourth - don't let the revs go below 4k 1 Quote Link to comment Share on other sites More sharing options...
jumping350 Posted November 25, 2012 Share Posted November 25, 2012 (edited) +1 on above take the car for a long trip really heat the cats up stick some cleaner in tank and go straight to m.o.t retest and should go through fine Edited November 25, 2012 by jumping350 1 Quote Link to comment Share on other sites More sharing options...
TonyZman129 Posted November 25, 2012 Author Share Posted November 25, 2012 Is the exhaust all OEM? Yes Quote Link to comment Share on other sites More sharing options...
Wookiee22 Posted November 25, 2012 Share Posted November 25, 2012 Is the exhaust all OEM? Yes In which case, see the advice above. Quote Link to comment Share on other sites More sharing options...
scubapics Posted November 25, 2012 Share Posted November 25, 2012 Stick a fuel cleaner in and take her for a blast down the motorway in fourth - don't let the revs go below 4k Slight problem with that in that the car doesn't have a valid MOT certificate. 1 Quote Link to comment Share on other sites More sharing options...
jumping350 Posted November 25, 2012 Share Posted November 25, 2012 if you take it out the day your having a retest your allowed to drive it on the road just make sure you book it with the garage so theres proof then do above before hand and go straight to m.o.t Quote Link to comment Share on other sites More sharing options...
ddcboyle Posted November 25, 2012 Share Posted November 25, 2012 from what ive heard cleaners dont work. but if cops pull you over u got 7days leeway Quote Link to comment Share on other sites More sharing options...
scubapics Posted November 26, 2012 Share Posted November 26, 2012 Just to explore this further... you are allowed to drive the vehicle to get it repaired or to a retest providing you have an appointment. It doubt that driving other than direct to either venues would be seen favourably by the law. I also doubt that you would be given a seven day wonder as the vehicle has failed an MOT, is on the MOT database and thus they know that you already know that the vehicle, in the eyes of the law, is not road worthy. You are more likely to have the vehicle confiscated, etc etc. Also your insurance is invalid. If you have an accident you are screwed. Go past any jam sandwiches and you are likely to be stopped immediately due to the use of ANPR cameras. It's just not worth it IMHO. Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted November 26, 2012 Share Posted November 26, 2012 Fuel additives are all good and well, but they take a good 2 tanks of fuel to work through, so if your willing to do the best part of 700 miles before turning up to the test centre i don;t thin thats going to work. If it was me i'd get an OBDII on to it and check and see if the lamdas have kicked up a code, you might just need a new lamda sensor. they don;t always turn the CEL on; so a code reader is required. there are quiet a few of us on here with the kit that can do that for you, or a garage should be able to check it. If its all clear my next trip would be to a terraclean provider http://www.terraclean.co.uk/ I must admit i was sceptical when i first cam across this on wheeler dealers, but having donw some reading it seems to be very effective. 1 Quote Link to comment Share on other sites More sharing options...
spursmaddave Posted November 26, 2012 Share Posted November 26, 2012 Strange, I have had 3 different exausts with HFC's over 4 MOT's and nearly 40k and not had any problems at all Quote Link to comment Share on other sites More sharing options...
ddcboyle Posted November 26, 2012 Share Posted November 26, 2012 ah my apologiea about 7day buffer, as the rest said, if ur driving to be tested Quote Link to comment Share on other sites More sharing options...
coldel Posted November 26, 2012 Share Posted November 26, 2012 Mine went through with 50k and a Milltek and Berks HFCs on it, we stuck the reader in and went off to have a cup of tea, took about five-ten minutes for the reading to drop down enough. 1 Quote Link to comment Share on other sites More sharing options...
jumping350 Posted November 26, 2012 Share Posted November 26, 2012 (edited) i had no cats in my old car and the reading came back well above 1 stuck some agent in it went for a 40minute burn and it came back at 0.02 or something so maybe worth a try its only a tenner i think anyway or like others say get codes read or find a friendly m.o.t man Edited November 26, 2012 by jumping350 Quote Link to comment Share on other sites More sharing options...
Allan Zada Posted November 26, 2012 Share Posted November 26, 2012 What fuel are you using? Quote Link to comment Share on other sites More sharing options...
TonyZman129 Posted November 26, 2012 Author Share Posted November 26, 2012 Thanks all for overwhelming response. Nice to see some true petrol Z heads out there.! In the end I took it back to the mot station where they kindly re-tested the emissions for free after a little rant across country.! To my surprise it passed a subsequent mot so leads me to think that the new exhaust hadn't sealed itself properly or something prior to re-test. In summary having added Forte Gas treatment & new middle section exhaust etc a re-mot brought the reading right down to 1.00 which smack bang in the middle allowed. I also put super unleaded fuel in the day before so wonder if that helped too.? A lesson learned for next year perhaps? Thanks again Quote Link to comment Share on other sites More sharing options...
spursmaddave Posted November 26, 2012 Share Posted November 26, 2012 You should really only use Super Unleaded, have a search for the many many threads on here.... 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.