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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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Excessive smokeViews : 429 Replies : 2Users Viewing This Thread : |
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Jan 5th, 2019, 22:23 | #1 |
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Last Online: Nov 17th, 2019 14:43
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Location: Chester
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Excessive smoke
My V40 2.0T with aftermarket LPG conversion is putting out a significant amount of smoke at quite specific moments. I have my mechanic looking into it but thought it would be worth sticking on here in case the combination of symptoms brings up an obvious problem to someone!
If I do 70 on the motorway and slow down to around 60, a thick cloud comes out briefly and lingers slightly where it comes out as opposed to spreading with the speed of the vehicle. It also seems to do it more at lower speeds but mostly when I lift off the accelerator. It's almost like something is building up under acceleration and then burning off when I take the pressure off. When I stop and leave the car idling, the smoke comes out consistently thick. It seems worse with petrol than LPG but I may be wrong with that. There are multiple error codes that mention lambda sensors and fuelling mainly. I reckon the smoke has a slight blue tint when I see it on the motorway but it looks more white at idle. The LPG system is also struggling to kick in over the past week despite being full of gas. The car has always had a problem with hesitation under initial acceleration now and again but that's mainly on LPG. One more thing: the fuel pump was replaced recently. Based on the error codes and the fact it's been running on LPG, I'm tempted to think it is over-fuelling. However, I am aware white smoke is generally water and blue is oil. Thank you. Last edited by nickar; Jan 5th, 2019 at 22:25. |
Jan 6th, 2019, 18:23 | #2 | |
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Last Online: Nov 17th, 2019 14:43
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Just in case anybody else is reading this with the similar symptoms, I think it is the valve stem seals based on this article at https://dannysengineportal.com/valve-stem-seal/:
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Jan 9th, 2019, 23:12 | #3 |
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Last Online: Nov 17th, 2019 14:43
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Location: Chester
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Nobody else seems to have any knowledge on this one so I stopped by the garage today. My mechanic said the smoke smells like fuel so it looks like I may be wrong about the oil burning!
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