f40 cab Posted October 26, 2015 Share Posted October 26, 2015 im suspecting a problem with inlet valve on cylinder 1, would somthing like this cause high co levels? not sealing properly or opening. Quote Link to comment Share on other sites More sharing options...
Paul Grainger Posted June 20, 2016 Share Posted June 20, 2016 Has your car failed the test? List the print out data and i will have a look. Quote Link to comment Share on other sites More sharing options...
gingergman Posted June 21, 2016 Share Posted June 21, 2016 You should look at the dates on all these topics your posting on, it's good that you're helping but I'd hope everyone has sorted them by now Quote Link to comment Share on other sites More sharing options...
f40 cab Posted June 21, 2016 Author Share Posted June 21, 2016 Hi yes it's an old one but I never sorted it out. Got put in garage and never got chance. It is suspected problem with inlet valve. But would this cause hi emissions. Try and find the report and post it. Quote Link to comment Share on other sites More sharing options...
Paul Grainger Posted June 21, 2016 Share Posted June 21, 2016 Why do you think it is a valve problem? Does it miss fire? Also what engine do you have? Hi CO is usually rich fuel mixture but this can be caused by several things. The Zetec engines used to have problems with sticky valves. Will wait to see your data. Cheers. Quote Link to comment Share on other sites More sharing options...
f40 cab Posted June 23, 2016 Author Share Posted June 23, 2016 Hi Paul I snapped the rocker arm stud. And it failed mot on emissions. I drilled and tapped it. Took it back and it past. A used it for a couple of months occaisonaly. Then garaged for over a year took for mot and failed emissions co% 5.283 HC 1604. Brought it home rocker cover off rocker stud slightly lose so re done with thread lock and torqued down. Its 1.6 cvh efi engine. But don't want to take it back to fail again on emissions if it's not a valve causing it. Thank you for the help Quote Link to comment Share on other sites More sharing options...
Paul Grainger Posted June 25, 2016 Share Posted June 25, 2016 Wow that is high. Is that the figures for idle speed? I am assuming that now your car is pre catalyst so there is no oxygen sensor? If this is the case then yes it could be the vave problem because the HC content is basically unburt fuel which could be down to low compression however the high CO would suggest over fuelling. Does it miss fire at idle speed? If so then I would do a compression test next to check the valve problem isn't to blame. If you fixed a missfire by tightening the stud then you have probhably fixed the emmissions problem too. Please let me know how you get on. Cheers Quote Link to comment Share on other sites More sharing options...
Guest nicholas huntley Posted June 25, 2016 Share Posted June 25, 2016 Sticky valves? Add Molyslip to fresh engine oil, preferably with rocker cover(s) off, try and get Moly into/around what you can see of the valve stems/guides. Not so easy I know, with stem seals in the way. No I'm not head of sales for 'Molyslip Ltd'. However I have found that Molybdenum Disulfide is a great lubricant, (Graphite). Engine will last forever! Nick. Quote Link to comment Share on other sites More sharing options...
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