Nowadays car runs on 0,5bar pressure(which is about 7psi if I'm correct) but previous owner ran it with bigger pressure and had it tuned to run a bit rich just incase.
Couple of days ago i was driving home and suddenly the mixture meter was saying the engine was running really lean. The light on the meter was right at the left end of the scale. As I writed earlier the previous owner had the car tuned to run a little rich so normally the light in the meter is somewhere in the Rich area of the scale. I've heard that this kind of mixture meter isn't the most accurate one but I think it's readings shouldn't be ignored. So I drove home and the meter said I was running really lean rest of the way(lucky there was only few hundred meter to go) and according to it the mixture didn't come richer even if I accelerated. The next day I discovered that meter shows the engine is running rich atleast when the choke is when cold starting the car but mixture goes leaner and leaner as the engine warms up and start to idle normaly. I did a little test run around the block and mixture got richer for a moment when I started accelerating from 1000-1200rpm but then it goes lean again. When idling you can here some puff-sounds in exhaust like there was some misfires sometimes and normally when cold starting it starts right up but now I have to try couple of times before it starts to run nice so I would say it really is running lean. Oh, and sometimes the idle also drops to 400-500rpm which it has never done before as long as I've owned the car. It was summer when I bought the car and it hasn't had any major problems until now and it's been cold couple of moths now already so I'm not sure if the weather is the one that has done the damage.
I don't have own garage and it's winter now and really cold(minus 15-20 celsius) here in Finland so it's not really nice to do any repairs outside but I can occasionally use my friends garage. I don't have previous mechanical experience on cars with turbos and fuel injections but I'm willing to learn and do as much repairs as I can on my own. I haven't been using the car to avoid doing any damage to engine. I'll be going to my friends garage soon so people could you give me some hints where to start looking for faults. I already found a crack on one of hoses coming from fuel pressure regulator, it looked like a vacuum hose but changing it to a new one didn't help. Sparkplugs(iridium) and wires and stuff are a bit old and should be changed soon and they will be and I will check those but other than those what would be the places to look for faults and I would appreciate detailed instruction of how-to test the parts in question to see if they work.
Edited by funktio02, 21 December 2010 - 12:32 AM.