bishbosh Posted August 28, 2005 Share Posted August 28, 2005 Coming home today from Devon I was descending Porlock Hill in Low 2nd under engine braking (auto box ) and noticed a significant amount of smoke exiting the exhaust. Once back on the flat the smoke disappeared. 3.9 EFI BTW. Any clues? Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted August 28, 2005 Share Posted August 28, 2005 Knackered engine - get a diesel, they smoke all the time! Quote Link to comment Share on other sites More sharing options...
geoffbeaumont Posted August 28, 2005 Share Posted August 28, 2005 Just keep your foot on the accelerator Quote Link to comment Share on other sites More sharing options...
Les Henson Posted August 28, 2005 Share Posted August 28, 2005 If you only get bue smoke when you 'blip' the throttle (overrun), then generally oil is getting into one or more of the cylinders through the valve guide(s) caused through worn valve stem oil seals. Les. Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted August 28, 2005 Share Posted August 28, 2005 as Les says, V8 smoking on overrun.... tends to be Valve Stem seals, easy fix, and cheap. ,.....if also on acceleration then Piston rings, not so easy ...and not so cheap Nige Quote Link to comment Share on other sites More sharing options...
Niall_CSK Posted August 29, 2005 Share Posted August 29, 2005 I'll third those replies. Except the one about the diesel Quote Link to comment Share on other sites More sharing options...
bishbosh Posted September 4, 2005 Author Share Posted September 4, 2005 Thanks for the replies guys. As I get no smoke with throttle and grey smoke only on hard over run (i.e closed throttle with 3k rpm) am I right to conclude that the consensus of the panel is valve stem seals? Quote Link to comment Share on other sites More sharing options...
Jon White Posted September 5, 2005 Share Posted September 5, 2005 Sounds like it - do you also get a good puff of smoke on cold start up? If so thats also often a sign of stem seals......... Jon Quote Link to comment Share on other sites More sharing options...
02GF74 Posted September 5, 2005 Share Posted September 5, 2005 as Les says, V8 smoking on overrun.... tends to be Valve Stem seals, easy fix, and cheap. ,.....if also on acceleration then Piston rings, not so easy ...and not so cheap Nige as FF says. Overrun condition would be closed throttle so big vacuum and very little fuel delivered so if vavle stems ae leaky, oil will get sucked in and it wold be that that is burnt off. Not entirely convinced that valve stem seals are the answer. There are two schools of though, much lie fitting switvel or procomp shock gaiters; IHBS the early ones were crappy felt/rubber O-rings that disintegrate and can cause blockages; the later rubber cup type with clips are better but you need to have different valve stem. New valve guides are the only way (from my experience - look at my old LRE sig - there valve stems themselves wear very little). Are you using 20/50 W? Quote Link to comment Share on other sites More sharing options...
SelwinnFroggit Posted September 14, 2005 Share Posted September 14, 2005 Check any vacuum conections going into the inlet manifold,it's a long long shot but i have known either brake fluid or auto transmission oil being drawn into the inlet manifold through faulty diaphrams etc. Quote Link to comment Share on other sites More sharing options...
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