Andrew Posted March 17, 2003 Share Posted March 17, 2003 Seems I have developed a bit of a problem with a smoking exhaust. This only happens when I come to a stop, several seconds later I get a small light bluey cloud of smoke coming out the pipe. This only happens when stopping and never driving around, it lasts for about 2 seconds and it’s gone and doesn't happen all the time. It's raised a concern because I have read other past posts on here about a similar problem, but it appears there has been no conclusions, or ones that I can see. Here are a few things I have done recently that may have caused this. One, I added a bottle of millers to half a tank of petrol, usually I add one bottle to a whole tank. Two, fitted an FCD upping fuel cut to 18/19 psi, car runs highest boost to 1.1 bar so well below FC. Three, had an oil filter change by Toyota and they refilled with Castrol SLX, I had been filling it with Valvoline. The Supra is on 39k miles at the moment, drives perfectly and smoothly. I also only every run the engine to 1 bar on very rare occasions, in fact I've probably on hit it 4 or 5 times in the last 6 months for a matter of seconds, so this is not a thrashed engine, this is what has me perplexed to be honest. Any help at all on this would be most appreciated. Andrew. Quote Link to comment Share on other sites More sharing options...
Alex Posted March 17, 2003 Share Posted March 17, 2003 You could try a thicker oil... The root cause could be oil leaking past the piston rings. Valve stems knackered (covered before so do a search) Turbo oil seals (new/rebuilt turbo's required) Brian Duff has the same issue which is more noticeable since his decat.... Quote Link to comment Share on other sites More sharing options...
Andrew Posted March 17, 2003 Author Share Posted March 17, 2003 Thanks Alex gives me more to search for. Quote Link to comment Share on other sites More sharing options...
eyefi Posted March 17, 2003 Share Posted March 17, 2003 sounds like valve stem. does it do a small puff on cold start up? Quote Link to comment Share on other sites More sharing options...
Andrew Posted March 17, 2003 Author Share Posted March 17, 2003 Not as far as I'm aware eyefi, happens only when coming to a stop, when the car has been running for awhile. Quote Link to comment Share on other sites More sharing options...
Andrew Posted March 18, 2003 Author Share Posted March 18, 2003 I tested the car this morning and it only smokes after pressure has been applied. Driving around the streets at 30-40 mph it's fine, when I hit the motorway and the speeds went up to 50-60 mph it happened when coming to a stop. Turbos??? If so what kind of bill am I looking at? Quote Link to comment Share on other sites More sharing options...
Andrew Posted March 18, 2003 Author Share Posted March 18, 2003 Pulled this info from the net. Castrol Formula SLX is a world beating lubricant for drivers seeking the very best performance from their car. It's the first of its kind, providing a fully synthetic, ultra free flowing premium performance OW-30 engine oil that gives instant lubrication and superior, low-temperature protection. This is the oil that Toyota put in, 0W-30 isn't this oil a bit too thin? Just seems odd my problem arrived once the oil was changed from Valvoline to this Castrol SLX. I'll do an oil change and see what happens. Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted March 18, 2003 Share Posted March 18, 2003 0W is a bit too thin really. I would go back to the Valvoline you were using. Quote Link to comment Share on other sites More sharing options...
Terminator Posted March 18, 2003 Share Posted March 18, 2003 I would have thought 5 or 10 would be the best bottom end oil figure for the MKIV. 0 grade oils pisses past most seals. Quote Link to comment Share on other sites More sharing options...
adi Posted March 18, 2003 Share Posted March 18, 2003 Keep an eye on it.. unfortunately for you an early sign of turbo seals is smoke on idling after a boosting session. It normally happens a few seconds to a minute after coming to a stop, doesnt produce any noticeable smoke when driving, and doesnt give smoke on startup. I'm not saying thats what it is, but it certainly has the symptoms. Perhaps the thinner oil caused it. Quote Link to comment Share on other sites More sharing options...
Andrew Posted March 18, 2003 Author Share Posted March 18, 2003 Fingers crossed I hope it's the oil. Hope it's not the turbos, a 1k bill is all I need at the moment. Thanks for all the help, see how it goes with an oil change tomorrow. Quote Link to comment Share on other sites More sharing options...
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