Smoking and probs?

[stevieyid]

Hi after my topic about heat soak i have come to the concluion that i may have something more serious to my slight misfire/hesitation as my car seems to be smoking a bit now to. I have read through all the old posts about smoking but cant seem to link it to my own case. Basically my S2 is starting to smoke quite bad especially when cold. The smoke is white and has a funny smell to it. Also after a few quite long runs it seems to hesitate when i floor it mainly in the higher gears. I had a remapp by mrc then i fitted the exhaust and then fitted the cone filter i know the wrong way round but could that be the cause of the hesitation and smoking? Also since i have had the car about a year now the thermostat has been stuck open and runs along 50 degrees most of the time. I still have not got it done could this have caused a problem with plugs ignition etc? Any ideas Cheers

[BRY]

Does it use any water?

[stevieyid]

no the water is fine. Was you thinking head gasket? The head gasket was replaced about 10,000 miles ago so hopefully its not that. Could a air leak or boost leak cause anything like this?

[stevieyid]

Anyone got any ideas? cheers

[merlin's S4]

If your thermostat is stuck then surely the engine will never warm up properly causing rich running! That'll make it smoke and smell funny for sure!!

[Knight Rider S4]

I has similiar problem with my S4 and it was the POS had gone and made the car misfire when under load and as Merlin says caused the car to run rich and smoke a little

[stevieyid]

thats what i was thinking. Would the engine running rich cause a misfire, or do u think cos it has been running rich for a long while the plugs are all clogged up?

[merlin's S4]

Is it a missfire or is it just hesitation? I would have thought that a missfire would be fairly obvious. Usually a fairly big jerk or a stop in acceleration before continuing which is often worse and more obvious under load! If it's running rich that'd cause hesitation and white smoke, not sure it would actually missfire. Might be worth checking the plugs. When were they last changed? If they are black (heavy carbon deposits) after the engine's been warmed up, then it's probably either running rich or the fuel isn't being burnt properly due to a weak spark. That could be something as simple as a worn plug or could be a coil or POS (if yours is an ABY). I still think that your thermostat could be causing your problems if it's running cold all the time. Does your car ever warm up properly?

[stevieyid]

Only warms up when sat in traffic and then once going again it runs just above the 50 mark. It not so much a misfire but it usually shoots through the rev range but sometimes it seems to struggle round the 4500rpm and like its loosing power. Boost is also affected. Seems to do it more in the higher gears. I did think boost leak but it does not always do it at WOT.

[T2Andy]

Mine struggled around 4\4.5k rpm but only when using cheapo fuel ,the engine struggled to rev through this point and hasnt done it for a while mine is also running rich at 0.6%
when it should be 0.3% .This week im using afuel system cleaner to see if this will clean the injectors which may be dribbling .

[stevieyid]

what fuel system cleaner are u going to use? Could be the fuel i suppose. When it done it the other day i had optimax in. Has never done it wirh tesco 99

[merlin's S4]

I've found Forte to be the best fuel system cleaner by far! There other Forte products are brilliant too!!

[T2Andy]

Im using forte ,im using fuel system cleaner this week and injector cleaner next each one got there own purpose will let you know if any different.

[stevieyid]

http://www.camskill.co.uk/products.php?plid=m1b0s26p53

Is this the stuff?

[T2Andy]

Thats the one im using next week the other is the gas treatment i paid 7.50 ea for mine.