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Engine stalls or stumbles when press accelerator from idle
I took the inlet hose off the throttle body and gave it a good squirt of carb cleaner/rub down with shop towels. Also directed spray into the IAC valve inlet (in the throttle body). Not much carbon in there - just a bit in the low flow areas by the butterfly spindle at each end. Tried to clean the side of the butterfly too.
Also cleaned the return spring and open/shut the butterfly actuator a few times. Unplugged/plugged the TPS, IAC and MAF connectors.
(Think removing MAF while engine running caused engine light to come on and engine to conk but it cleared after a few stop/start cycles).
Problem was there before I started fiddling and is definitely gone for now - did a short 8mile round trip to warm it up. I realise that another symptom I had was jerkiness when taking foot of accelerator during normal driving - ie going from engine pulling to coasting. Much smoother now.
Fingers crossed . . . .
You'd have done one thing at a time - eg move actuator/lube spring and test, then move on to clean butterfly and test, then clean iac inlet and test, then each electrical connector plug etc?
I didn't really expect to get a result (if it lasts) with such minimal interventions so was just giving it all a quick clean down to rule out easy fixes before considering more involved actions.
When I'm fault finding I if possible perform a repair and then check for improvement. Eg un/plug a sensor and see if it runs better then repeat on another sensor eliminating options one at once. Like I said though I get a bit OCD about this and I understand I am not normal.
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!
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