Gold FFM thebartman Posted February 3 Gold FFM Report Share Posted February 3 Took the car out for a couple of short runs as a shakedown after some recent work. Upon return, I do what I always have done - which is to leave it idling for about 3-5 mins just to let everything settle down before turning it off. After I turn off the ignition, I can now count about 5 seconds, and there is a little "Pop" just like a small backfire. This also happens even when the car has been running on the drive and getting up to temp. Could someone explain why this happens ? - and if it is OK to leave as is, or is there another opportunity to fix something before it breaks ? PS - Turning the stereo up doesn't fix the problem 😉 Quote Link to comment Share on other sites More sharing options...
CarBuff Posted February 3 Report Share Posted February 3 Our friend's '85 produces this shutoff POP as well. Especially after I drive it... For that matter, so does our snowblower... 2 Quote Atwell Haines '88 Esprit Succasunna, NJ USA Link to comment Share on other sites More sharing options...
lotus-62 Posted February 3 Report Share Posted February 3 I had the same thing on a NA engine after I had wraped the exhaust in heat wrap, I had a high idle so after turning the engine off it still sucked in some air/fuel mixture, this then went into the hot exhaust manifold and 2 sec after turning it off BANG, (but only on a hot engine) I lowered the (too) high idle back to 850 and this (for me) solved the problem. Quote Link to comment Share on other sites More sharing options...
Gold FFM thebartman Posted February 4 Author Gold FFM Report Share Posted February 4 Interesting - I too have an idle nearer 1,000 rpm, so will look at this. Presumably it's not doing any damage to anything? Quote Link to comment Share on other sites More sharing options...
910Esprit Posted February 4 Report Share Posted February 4 As mentioned, its almost certainly unburned fuel igniting in he exhaust. But to do that, something needs to be pretty hot. I'd probably double check that your ignition timing is to spec and your mixture is not too lean. Maybe also check that spark plugs are correct grades? Quote Link to comment Share on other sites More sharing options...
Gold FFM thebartman Posted February 4 Author Gold FFM Report Share Posted February 4 Thanks @910Esprit - looks like time to research setting carbs up properly. 👍 1 Quote Link to comment Share on other sites More sharing options...
jonwat Posted February 4 Report Share Posted February 4 3 hours ago, thebartman said: Presumably it's not doing any damage to anything? It's a little explosion in the exhaust system so eventually it will blow a hole in a weak spot. Quote Cheers, John W http://jonwatkins.co.uk Link to comment Share on other sites More sharing options...
CarBuff Posted February 4 Report Share Posted February 4 5 hours ago, jonwat said: It's a little explosion in the exhaust system so eventually it will blow a hole in a weak spot. So you are saying, Lotus planned it that way to advise owners of a dodgy exhaust?😆 1 Quote Atwell Haines '88 Esprit Succasunna, NJ USA Link to comment Share on other sites More sharing options...
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