Unstable Idle and rich mixture - what to do? - Alfa Romeo Forum
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Unstable Idle and rich mixture - what to do?

Got an 1990` 33 16v with a newly cleaned KN air filter(Got an tube that supplies it with fresh,cold air), COMPLETE CSC exhaust, brand new lambda, new spark-plugs, new electro-injectors, new fuel pump, New fast idler.

But i still get the unstable idle, and its getting a rich mixture. Its popping in my exhaust. Its also difficult to drive slow without jerking forward. Its also a problem that the car stalls when stopping for a red light etc.

Anyone got an idea how to fix this? If the fuel pump is sucking air along with the fuel, will this affect anything?

cheers in advance!
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Re: Unstable Idle and rich mixture - what to do?

it could be the AFM ?
that can cause all the issues you mentioned.

can you get someone to "plug" it in for diagnostic?
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idle , mixture , rich , unstable

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