Just fitted my Squadra chip,generally love the low end grunt and associated exhaust sound,and its smoother at high revs too. But my idle went wierd after fitting,coming off the power the engine does not settle down very well,it seems to pulse when in traffic which is a bit of a pain as its nearly stalled a couple of times. As the chip is supposed to improve idle,could this be an engine sensor fault of some kind,idle valve or whatever? *Its all rather odd*
Most idle problems seem to relate back to a dirty idle control valve(the thing that makes a buzzing noise when the ignition is on, or is mine broken!), i cleaned it recently, the idle is more stable, does it happen when the engine is warm/cold or both, what i did helps when the engine is cold.
Running on optimax,but only switched from normal stuff just before chipping so hopefully it all just needs to settle in. Any exhaust popping would be a bonus,my old 1.7 Sprint used to sound gorgeous on overrun. ..............Mind you I was in traffic behind a Subaru WRX with a serious looking exhaust today,even stood still,with my windows up I could hear(and feel!)it throbbing away, eek! Beautiful noise,made me feel quite inadequate,oo-er.
Could be the Lambda sond which is a common problem on modern Alfas. It could be the increased performance/exhaust temp that finally has killed it. Don't know, but I have similar problems with my Q4 when it passes 85 C on water temp and the answer I got from a skiled workshop was what i wrote above.
A-M,ta but I reckon the lamda failing would cause more serious symptoms, it's getting better with mileage but I'm cleaning the idle valve this weekend,120,000 miles worth of oily goo cant be doing it any favours can it? wink
[QUOTE]Originally posted by FLO:
Allow a hundred miles or so before jumping to conclusions. If the idle still pulses and will not settle the the throttle valve will need to be rest to allow slighty more air to enter the engine on idle. The throttle switch will the need to be reset so that the ECU still thinks the throttle is fully closed.
Ensure 98 octane fuel is used. Optimax is better still 98.6- the highest commercially available.
Probably not the lambda sensor but these are a weak point. They do not need cleaning unless you drive like a granny.
Any temperature related running faults are probably the coolant temperature sensor or possibly the ambient air temp sensor.
Hope this puts your mind to rest.
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