If you've seen my other threads you'll know that my car failed its MOT on emissions. I also have a couple of fault codes stored.
94 - Hall sensor voltage high
116 - Boost too high
I took it to the rolling road on saturday to have it looked at. He said that the readings from the emissions were spot on. The car was left running for a bit and smoke started to come at idle (dirty greyish in colour). Looks like its been failed on the actual smoke rather than the emission reading. He put it on the dyno and did some tests. The boost was fine and there was about 150bhp at the wheels. He ran it for a while and it continues to put smoke out the back. The smoke cleared afer a while of driving and then we couldnt get any to come out again under any load conditions. He suspects the car needs a long run to clear out breathers etc. because it was off the road for a year before I bought it.
Later on that day after running at idle for a few minutes the car got a bit smokey again. My problem is that I cant take it for a long run without an MOT and I cant get an MOT without a long run! Is there some sort of cleaner I can add to the fuel to clean out the engine and are there certain pipes I should remove and give a good clean with parafin?
Just take the breather pipes off one at a time and clean them that way. If you have any filters in the cam cover or anything like that, replace them. Be your engine, and breath.
there are loads of choices when it comes to fuel treatments that help clean the fuel system as well as the pots and the carbon build up, Which must be caked on by now, if its been sitting for a year.
go to www.lucasoil.com and then products, I use the Lucas fuel treatment, it helps. If its fuel injected then I guess you carn't beat an ultra sonic, which might be the best idea, because the 'o' rings may have perished after so long and they will be replaced at the same time.
I'm sure you will get loads of advice on this one,but this should be enough to get you started.
You may have some paying out to do to replace the parts that have persihed after not being used for a year
Check the pipes from the turbo to IC and IC to inlet, if they're full of oil then it's probly the seals in the turbo.
Clean the pipes with petrol and inside IC itself and it should stay smoke free for long enough to get through an MOT, then get the turbo looked at.
He did mention that it looked like one of 2 things when I got there, turbo oil seals or valve guide seals. He then ruled these out after the smoke cleared when it had been run on the dyno for a while with the wind fan on. The smoke wasn't blue like you'd expect to see when oil is being burned. There is also a bill for a pressure test on the head and turbo about 2k ago so valve guide seals and turbo seals would more than likely have been noticed at this time? Its like there is some gunk or other sitting somewhere and when the engine is left to idle and get hot it begins to burn and give off smoke.
I'lll clean up all the breathers to the turbo and also try a fuel treatment for the injectors and so on.
anthonyian, I know what you mean. I understand the basic operation of the turbo from reading about them but I couldn't draw you a picture of one even after looking at the one on my car! They don't look anything like I thought!
Try a different testing station. Mine was the same last year and I thought it was going to fail. I asked them while they were doing the test and they weren't really bothered it shouldn't affect the emmisions much if it's only a bit.
Quite a lot of smoke. I drove it to the rolling road - about 20 miles. The engine was completely warmed up when I got there. After leaving it running for about 5 minutes smoke started to appear and then it came out as he drove it on the rollers for a couple of minutes, then he messed about with his equipment and drove it again, more smoke for a minute or so. It was left running again and then after that there was no smoke whatsoever (other than a flash of black at a gear change which is nothing to worry about).
I'm going to get it retested at the same MOT station. If they don't pass it I'll have to go elsewhere. Problem is it may fail on something else at a different station....
ok I removed the breather that goes to the turbo and gave it a good clean out with parafin. Nothing major in the way of dirt there. Couldnt really find any other breathers. When I first started it, left it running and reversed out of the dive there was a lot of smoke (white/grey) but by the time I had got a mile down the road there was nothing. Could this have been traces of parafin burning off?? How much pressure is there in the breather that comes out of the back of the rocker and then feeds into the turbo?