Member Jonathan Kay Posted October 28, 2022 Member Share Posted October 28, 2022 I can't make out some of the numbers. Please can you upload them at higher resolution.(I'll do that if you would like.)Jonathan Link to comment Share on other sites More sharing options...
Amos91 Posted October 28, 2022 Share Posted October 28, 2022 It's passed everything apart from lambda, which according to that is showing it's running really lean. Ideally you'd plug it in to make sure it's entering closed loop, coolant up to temp etc. But I'd make sure the exhaust system isn't leaking anywhere as that will cause the issue, otherwise you can always try another lambda. Link to comment Share on other sites More sharing options...
C7 Owl Posted October 28, 2022 Author Share Posted October 28, 2022 Iv tried rescanning in jpg and exporting to max resolution. Still looks bleary when I edited the post and reuploaded. Here are the PDF. Seemed to post clearer when I did that. IMG_20221028_0003.pdfIMG_20221028_0002.pdf Link to comment Share on other sites More sharing options...
C7 Owl Posted October 28, 2022 Author Share Posted October 28, 2022 Ok so look for an exhaust leak and then Lambda sensor. Any tips on finding exhaust leaks and likely places on the Caterhams. Is it normally on the manifold? Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted October 28, 2022 Member Share Posted October 28, 2022 Thanks.The problem with PDFs on this site is that they sometimes don't show with some browsers, see John Vine's comment upthread.Those are much clearer than the previous versions. Are you using the shortcut upload method? That automatically reduces the resolution. This isn't usually a problem for photos but can be for documents. The older upload method doesn't do this.Jonathan Link to comment Share on other sites More sharing options...
John Vine Posted October 29, 2022 Share Posted October 29, 2022 #25: To me, that MOT result suggests an exhaust leak drawing in air, as your CO and HC values are ok. With the engine on tickover, bung up the tailpipe with a tightly fitting rag and listen for leaks.There are three places where your exhaust system could be leaking: manifold, collector exit, and the mounting boss for the lambda sensor. Check all these. Of course, you might have a leak somewhere else due to corrosion, so check the condition of pipes and silencer. For the latter, you'll need to remove the heat shield (usually held on by three large jubilee clips).JV Link to comment Share on other sites More sharing options...
John Vine Posted October 29, 2022 Share Posted October 29, 2022 #25: Also, those values for HC and CO suggest that not only do you have a cat, but also that it's working. There's no way an EU2 K engine could achieve those results without one.JV Link to comment Share on other sites More sharing options...
C7 Owl Posted October 29, 2022 Author Share Posted October 29, 2022 Thats good news, exhaust has a nice note and the revs are gained nice and freely so was not keen to change anything. I'll get a rag and try and find if there is a leak. In terms of products to reseal. Any recommendations, how is the Holts Gum Gum and Exhaust repair bandage? Halfords have in stock so could sort tomorrow if there is a leak. Or is it a waste of time doing anything other than getting a welder to take a torch to it. Link to comment Share on other sites More sharing options...
John Vine Posted October 29, 2022 Share Posted October 29, 2022 Permatex 81878 gets good reports here. It's also sensor-safe.Given that the exhaust system is all stainless, corrosion is unlikely (but possible).JV Link to comment Share on other sites More sharing options...
SM25T Posted October 29, 2022 Share Posted October 29, 2022 Gun gum bandage is not for 7s. Link to comment Share on other sites More sharing options...
revilla Posted October 29, 2022 Share Posted October 29, 2022 Look for cracks around the welded joints. If it's cracked, get it welded, not otherwise sealed up. Cracks will only spread, then you'll have an exhaust hanging off. Link to comment Share on other sites More sharing options...
C7 Owl Posted October 29, 2022 Author Share Posted October 29, 2022 Im going to take a look tomorrow. I dont suppose anyone knows a good welder around the Sutton/ Banstead / Redhill area? Link to comment Share on other sites More sharing options...
C7 Owl Posted October 30, 2022 Author Share Posted October 30, 2022 If I dont find a leak. I have had a quote from redline for the lambda sensor. It seems a bit high though at just under £200 inc vat. I have found this Lambda Sensor. I can see that EU2 1.8 k series definitely work with this. But it seems that any pre 2000 k series should also. I have found even cheaper ones on ebay but not sure they are genuine bosch parts so will stick with the OEM equivalent ones. Does anyone know if MHK10006 is the right part number for the EU2 1.6 K series? Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted October 30, 2022 Member Share Posted October 30, 2022 "Does anyone know if MHK10006 is the right part number for the EU2 1.6 K series?"https://www.caterhamlotus7.club/comment/2259078#comment-2259078Jonathan Link to comment Share on other sites More sharing options...
Sim Posted October 30, 2022 Share Posted October 30, 2022 Rimmer Bros claim to do a genuine part for about £80definitely check the connector to the lambda sensor though as well as for exhaust leaks simon Link to comment Share on other sites More sharing options...
C7 Owl Posted October 30, 2022 Author Share Posted October 30, 2022 Yes saw the Rimmer Bros one too. The posts on this site keep referring to the 1.8 K series but I reckon will be same part for 1.6. I'll drop Rimmer Bros an email to see if they know. Link to comment Share on other sites More sharing options...
revilla Posted October 30, 2022 Share Posted October 30, 2022 All the different EU3 K Series used the same lambda sensor MHK100840.All the different EU2 K Series used the same lambda sensor MHK10006.The only difference between the two is the connector, EU2 has a 4-way Econoseal to suit the EU2 loom.To be honest, any standard 4-wire narrow-band lambda sensor with the correct thread will work fine, they are all pretty much the same. They're a fairly generic technology. I'm running one off a Toyota, I have a custom collector on my exhaust with the lambda boss coming out horizontally, it was a bit close to the bodywork and the barrel of the Toyota one was a bit shorter. I just changed the plug and it was fine.I certainly wouldn't be paying anything like £200 for one myself! Link to comment Share on other sites More sharing options...
John Vine Posted October 30, 2022 Share Posted October 30, 2022 You can also get MHK10006 (as BOSCH 0258003229) for £60.50 incl delivery from Opie Oils (with Club discount).JV Link to comment Share on other sites More sharing options...
John Vine Posted October 30, 2022 Share Posted October 30, 2022 A thought. Is this joint fractured?JV Link to comment Share on other sites More sharing options...
C7 Owl Posted October 30, 2022 Author Share Posted October 30, 2022 Didnts manage to find the leak. Gonna give it another shot tomorrow, was a bit windy so made it a little tricky. Will the fumes be quite obvious if exhaust is blocked up? I'd blocked it but a bit was still coming out through the rag. Could not see anything escaping from any of the joints. Link to comment Share on other sites More sharing options...
C7 Owl Posted October 30, 2022 Author Share Posted October 30, 2022 Opie oils sounds like a good shout. Thanks for confirming that MHK10006 it looked like it but nice to be sure before ordering. Link to comment Share on other sites More sharing options...
John Vine Posted October 31, 2022 Share Posted October 31, 2022 #45: You're unlikely to actually see anything. It's more a question of listening for escaping gas. Take a thick rag, fold it several times, and then hold it over the end of the pipe with the flat of the hand. (The rag is there to stop you burning yourself!)If you don't have a leak, that's good news insofar as it suggests your exhaust system is in good order. But we'll then need to think again about that lambda value. ETA: I forgot to ask.... Does the car run well on the road? Smooth acceleration, no hesitation or misfiring? Economy ok?JV Link to comment Share on other sites More sharing options...
C7 Owl Posted October 31, 2022 Author Share Posted October 31, 2022 I have not driven it much this year due to time it took me to replace binding rear calipers, but noticed on the way to the MOT test centre that their was hesitation at low revs and felt a bit lumpy. No misfire though from what I could tell. Im going to have another go later in the week and use soapy water on the joints hopefully will bubble up if there is a leak. Will also listen more carefully had mainly been looking for smoke forcing its way out. Link to comment Share on other sites More sharing options...
Wrightpayne Posted November 1, 2022 Share Posted November 1, 2022 Could an out of calibration throttle position sensor (TPS) cause the emissions issue? This is known to cause stutters / rough running. To reset, ignition on but not started, fully press the throttle pedal 5 times and ign off. Link to comment Share on other sites More sharing options...
grumpy the 7th Posted November 1, 2022 Share Posted November 1, 2022 Now THIS is what you call an air leak This professional fix is what I did to take the car to to Metal Micky for a shiny new Raceco Link to comment Share on other sites More sharing options...
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