[alfamat4]

Hi engine management light has come on and I suspect lambda sensors maybe faulty,no 1 plug is all grey 2,3 and 4 are grey and black , does this probably mean 1 or more are going wrong ?

 

[sprint_veloce]

What fault code/s are you getting?

 

[alfamat4]

I have not plugged it in yet but as I have 4 lambda sensors does this indicate anything ,thanks

 

[Verbout]

ah, read the post correctly, nothing to see here.

 

[Rockhopper]

Is it running well? Black spark plugs indicate its burning oil although pictures would help, it might be that one cylinder is running lean.

 

[scottyf]

Sounds like one is running a slight bit lean.

Most of the spark plugs I've taken out of the twinnie tend to be a bit on the white side due to the lean burn tendencies of the engine.

Spark Plug Analysis - Technical Information - NGK Spark Plugs Australia

 

[alfamat4]

Yes it starts fine ,revs ok ,bit lumpy I would expect them to be all grey normally but the jts having 4 lambdas can anyone tell me which lambda does what ? oil consumed around 2000 a pint

 

[kandlbarrett]

First thing to remember is that modern engines have a feedback loop via the lambda sensors to ECU (computer.) It also means they can run very lean so plugs are much cleaner and whiter than us older folk are used to seeing so even a brownish plug is a bit rich.

After that they are suck / squeeze / bang / blow.

Without seeing the plugs it is hard to know if it is oil or rich running but 2,000 miles per pint isn't massive for one of these engines.

Without having the codes you don't have any guidance.

Code readers on ebay, amazon and other sites are £20 or less.

What you could have though is a slight exhaust leak before one of the lambda sensors. As well as allowing exhaust out it allows air into the exhaust. Air contains oxygen. The lambda "senses" the excess oxygen and thinks the car is running lean so feeds it extra fuel until the two balance. So your ECU thinks the car is running correctly but getting excess fuel.

I would buy a code reader but before it arrives do a very thorough check for exhaust leaks in front of the lambda.

Other checks you can do are leaking air hoses, and possibly clean the MAF.

 

[alfamat4]

Thanks for the info will have a nosy around for leaks and check out readers,or is there a way of using smart phone as a plug in ?

 

[alfamat4]

Well bought one of those Bluetooth eobd readers off eBay£9 torque app brilliant ,popped up p0161 ,p1653,p1654 now the harder bit what's it all mean guys anyone had same codes ?

 

[sprint_veloce]

Clear the codes and see if they come back. If they do, google the codes and see what they relate to.

 

[gazza82]

http://www.datsc.com/tabid/122/OBD-Error-Code/P0161/Diagnostics/fiat/Default.aspx

http://www.datsc.com/tabid/122/OBD-Error-Code/p1653/Diagnostics/Alfa-Romeo/Default.aspx

http://www.datsc.com/tabid/122/OBD-Error-Code/p1654/Diagnostics/Alfa-Romeo/Default.aspx


Now you just need to hope that the codes are the correct ones .. they may be cheap and appear to work, but they don't always ...

 

[gazza82]

[double-post]

 

[alfamat4]

Quickly wiggled variator solenoid connector this morning that code now disappeared,Tom the breather pipe ,it's great to have a idea where to start,I hope it's not telling me porkys