misfire - Alfa Romeo Forum
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misfire

I have a misfire on my 156 20 ltr on a2 plate when driving on the motorway is fine but as soon as you come to a roads its starts to hold back like its misfiring can anyone help plaese
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It's very difficult to be specific but I'll give it a go!

Firstly, is the engine management light on? If so, are you able to get the codes read?

Ignition

Are the spark plugs in good condition? When were they last changed?

Air

Try disconnecting the MAF, it may stall on idle and the engine management light will come on but if it drives better, there's your problem.

Are all the hose connections between the MAF and throttle body tight and hoses free from splits?

Fuel

If the injectors are dirty a can of BG44K may help.

A diagnostics check would really help to narrow things down a bit.
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Hmmm richbull

hi thanks for your help iv done maf and still the same plugs where changed last year and engine light is on but no codes
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What software are you using to check the codes?
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Did you use quality fuel 95-98 octane last time you filled up? No ethanol!!!!
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