Guest martinkerr Posted March 14, 2004 Report Posted March 14, 2004 hmmmm.. gal just failed mot on emmissions yesterday, man has never seen a reading so high! car dosent smoke, engine sounds ok, idles well, pulls well considering the weight of it but the fuel economy is very poor can anybody help!? please! thanks martin 95 glx 2.0 petrol 81kno a/c Quote
seatkid Posted March 14, 2004 Report Posted March 14, 2004 man has never seen a reading so high! :huh: Really? :lol: Like what was the result? (numbers please) car dosent smoke, engine sounds ok, idles well, pulls wellSounds reasonable - has it been serviced recently (by a dealer?) fuel economy is very poorPlease elaborate. What did the garage that did the MOT suggest the solution was? (i.e. How much did they want to fix it? :o ) Do I sound cynical or what? Quote
Ivor_E_Tower Posted March 14, 2004 Report Posted March 14, 2004 Any idea what state the plugs are in? Quote
_dg Posted March 14, 2004 Report Posted March 14, 2004 I would get a second opinion form a garage with a [sun?] tuning diagnostic machine that should be able to pinpoint the problem and provide you with a computer print out too. Quote
Guest Turbo Posted March 14, 2004 Report Posted March 14, 2004 How do these modern engines work with cold start injectors etc ? Couldn`t it be something on this line that isn`t knocking off on a warm-up sensor causing it to run too rich ? First though I would check the air filter. Quote
Guest daddycool Posted March 14, 2004 Report Posted March 14, 2004 My galaxy also suffers from stupid fuel consumption. It is due its 90k service very soon so will have that investigated, in the meantime any ideas? Quote
Guest nimrod Posted March 15, 2004 Report Posted March 15, 2004 check the condition of the air filter and the engine oil a blocked filter can lead to the engine running rich and dirty contaminated oil wont help either! you could try running a fuel additive through the system to help clean it but I doubt whether it would help much? although there is something on the market that says its cleans cats? cataclense or such like? If the garage does do the work get them to change the sensor first and retest it before they do the cat! good luck Quote
seatkid Posted March 15, 2004 Report Posted March 15, 2004 are they taking the p*ss??? Yes I think so. <_< You still haven't given us the numbers - the MOT station is obliged to give you the details of the emission test results.....if they didnt give you the printout on the day, then it's pointless asking now - they would only be lying if they said they had them... it takes between Quote
Guest martinkerr Posted March 15, 2004 Report Posted March 15, 2004 thanks for the advice, will let you all know how i get on in the meantime off to buy a GSX 600 F, 2 wheels are better than 4 in the summer <_< Quote
Guest yurir Posted May 17, 2004 Report Posted May 17, 2004 Just failed the emissions test too !Have a few questions and hoped you chaps might have some ideas. What do these readings mean ? ................rpm.....min.....max....actual.....Status ..HC..........2500...----....1300....0003.....Passed ..Lambda...2500...0.97.. 1.03....1.179.....Failed Is Lambda another term for C0 ? And does it means the CO is high or low ? I don't understand it. If the HC (I'm assuming that's unburnt hydrocarbons) is good, why will the CO be bad ? Also, would an inlet air leak cause an emisions problem in a closed loop system ?What abount a dodgy MAF; wouldn't the closed loop correct for it ?The lambda sensor was replaced a couple of months ago. Many thanks,Yuri. Quote
seatkid Posted May 17, 2004 Report Posted May 17, 2004 The Lambda probe measures oxygen content and is part of the closed loop control system. Too high a reading indicates the mixture is too weak :lol: (with possible high NOx) and the ECU has not compensated sufficiently. Could be MAF or air leak after MAF Quote
Purple Peril Posted May 17, 2004 Report Posted May 17, 2004 Try Cataclean, infomercial on the telly looked bloody interesting! Can Buy here:-http://www.shopamerica.co.uk/product.html?...campaign=google Test results can be found on here:-http://www.systemproducts.com/ Quote
seatkid Posted May 17, 2004 Report Posted May 17, 2004 Lambda has nothing to do with the performance of the CAT Quote
Richmond Posted May 17, 2004 Report Posted May 17, 2004 There's some good info on this on a thread about performance/economy improvements. IIRC, lambda is a measure of the difference between the actual fuel:air ratio and the stoichiometric (theoretical) ratio (lambda of 1 is stoichiometric, >1 indicates more air than stoichiometric (lean), <1 more fuel than stoichiometric (rich)). The sensor measures this and corrects the fuel/air intake to maintain the lambda value within narrow limits. Measurement is actually of oxygen in exhaust. It looks as if yours is running pretty lean which leads to high NOX emissions (as there is insufficient oxygen (from air) knocking about to allow them to be oxidised by the cat, I think). Maybe a new lambda sensor is needed or (as already suggested) whatever it is under the bonnet which is controlled by the lambda sensor (injection pump? MAF?) could be on the blink. Quote
seatkid Posted May 17, 2004 Report Posted May 17, 2004 High NOx comes from excessively high combustion temperatures which is what happens when its too lean (i.e. too much air). Quote
Richmond Posted May 17, 2004 Report Posted May 17, 2004 High NOx comes from excessively high combustion temperatures which is what happens when its too lean (i.e. too much air). That makes more sense. Quote
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.