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Off idle stumble - where to look next?

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    Off idle stumble - where to look next?

    Hi All - I'm chasing an off idle stumble my 91 318is has. It REALLY bothers me!

    I believe I've eliminated all vacuum leaks with new hoses, I've replaced both intake gaskets, cleaned injectors, put in new air filter, fuel filter and plugs. Plug wires look good but I have ordered a COP kit to replace them anyway as the car has 188K on it and have no idea when/if they were replaced.

    The car had a terrible stumble whenever I accelerated but new plugs (the wrong ones were in there) cured 98% of the issue.

    Here are my current 'symptoms' - when car is cold it appears to idle and accelerate just fine (idle is smooth and right around 800 rpm). As it warms (temp gauge off the blue box to the middle range where it stays) is when the off idle stumble/bog occurs. It is just when pulling away in first and sometimes when going from off throttle to feathering it on in other gears. If I pull away hard it does not seem to be an issue. Something else I've noticed is that once warm, the idle climbs to 1000-1100 rpm but fairly steady (sometimes a quick stumble but nothing regular).

    I'm thinking maybe an o2 sensor or the coolant temp sensor. Any thoughts if I'm going down the correct path? Is it possible to test those two items or is it just a replace and see what happens type job?

    Any other places to look/advice would be appreciated too!

    #2
    Need to CK the ICV. May be gummed up. Also all related hoses and wiring.

    Hot idle issues usually related to ICV, Vac. leaks, coolant temp sensor(theres 2, 1 for guage 1 for engine manage.) or air intake temp sensor.

    Have you pulled codes yet? See whats popping up.

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