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C30 / S40 & V50 '04-'12 / C70 '06-'13 General Forum for the P1-platform C30 / S40 / V50 / C70 models |
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1.8 Petrol Engine Very High EmissionsViews : 2300 Replies : 10Users Viewing This Thread : |
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Mar 13th, 2019, 09:42 | #1 |
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1.8 Petrol Engine Very High Emissions
Good Morning. Any help here will be appreciated please. My V50, 2006, 1.8 petrol, has failed MoT on VERY high CO and HC emissions. The tester said that they started just out of spec and then shot up as he ran the engine (expecting them to drop). He also said that he had to open the workshop doors and windows to clear the smoke! The compressions all appear to be good. My fuel consumption seems to have dropped recently, although it has never been good and performance has never been impressive. Three weeks ago I replaced the EGR valve (to stop clouds of smoke and heavy pre-ignition). The engine management light is not on and my ALDI fault code reader says that there are no faults recorded (having cleared the one from the faulty EGR valve). I have done the obvious; air and oil filters, oil, plugs. I am wondering about a failed temperature sensor or air-flow sensor so will check those. I have booked it in for a check on the volvo diagnostics machine, although I wonder if I will be wasting my money as there are no apparent fault codes. Many thanks. Kim.
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Mar 13th, 2019, 10:13 | #2 |
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I was going to say it might be worth finding someone with VIDA to see if that reveals something..
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Mar 13th, 2019, 21:00 | #3 |
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Same thing here just failed MOT on high emissions white smoke with rotten egg smell yet no lights, changed basics plus lambda sensor and smoke still there.
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Mar 13th, 2019, 21:21 | #4 |
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Some bedtime reading
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Mar 13th, 2019, 21:57 | #5 |
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That thread is very instructive thank you. I am not sure that with 125k miles on the clock and 13 years of age it will be worth stripping the engine to replace oil control rings though. What puzzles me is the drop in fuel consumption; I would not have expected that if only oil control rings have worn. Fuel consumption has never been good, an overall average of 34 is the best I have achieved. Even sitting at 60mph on a long motorway run will not get me to 40mpg. I will see what the Volvo specialist diagnostics reveals.
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Mar 14th, 2019, 15:44 | #6 |
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As per the other similar post today this will not be the piston rings, white smoke must be water getting into a combustion chamber.
Try googling 'white smoke' and 'mazda' as the engine's are the same, this might throw up more clues for you.
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