jc1980 Posted February 15, 2021 Share Posted February 15, 2021 Hi all I have entered back to the world of imprezas after owning a classic a while back. I have picked up a Impreza GR Hatchback 2.5 WRX 2008 with 118,000 miles. Car runs really well and pulls well etc etc. Only thing i have noticed is that is it quite smokey (white smoke) on idle cold and engine warm. Once warm and on the road whilst driving it doesn't smoke. Now the obvious is head gasket but why would it only do it on idle? and I have heard that these aren't that prone to head gasket issues. I have also heard that another possible is turbo seals letting small amount of water in?? I am loosing very small amount of water amount of my coolant tank each week. approx 50-100miles. Has anyone experienced this on this engine and what was the cause/issue? Thanks in Advance J Quote Link to comment Share on other sites More sharing options...
Jay762 Posted February 16, 2021 Share Posted February 16, 2021 Could be turbo seals - try a sniff test, also is your coolant expansion tank being over filled by excessive pressure caused by HG failure? Quote Link to comment Share on other sites More sharing options...
jc1980 Posted February 18, 2021 Author Share Posted February 18, 2021 What's a sniff test ? Is that for the turbo seals or the HG? What am I looking / smelling for ? Also where you say expansion tank filled, do you mean where it builds up with pressure? Quote Link to comment Share on other sites More sharing options...
Jay762 Posted February 19, 2021 Share Posted February 19, 2021 The expansion tank I am talking about is to the right of the radiator - It fills when the pressure lifts the valve in the cap, pressure from teh cylinders due to a leaking head gasket can pressurise the cooling system causing the valve to lift here is a vid demonstrating a sniff test Quote Link to comment Share on other sites More sharing options...
Tidgy Posted February 19, 2021 Share Posted February 19, 2021 White smoke on cold start is perfectly normal. Is it smoking when it's warmed up? Quote Link to comment Share on other sites More sharing options...
jc1980 Posted February 19, 2021 Author Share Posted February 19, 2021 4 hours ago, Tidgy said: White smoke on cold start is perfectly normal. Is it smoking when it's warmed up? Yes smokes on idle when warm as well ☹️ Quote Link to comment Share on other sites More sharing options...
Tidgy Posted February 19, 2021 Share Posted February 19, 2021 7 hours ago, jc1980 said: Yes smokes on idle when warm as well ☹️ Hmm that's not so good, as above sniff test and go from there. Quote Link to comment Share on other sites More sharing options...
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