Hello,
This is a bit of a long story, but I feel all this information is important as I cannot, for the life of me, figure out what this issue is.
My IS300 will always start first time on a cold start, however if I warm the engine up and leave it to cool for about an hour or so, it will sometimes splutter/misfire when starting (See video). It will start if I feather the throttle and it doesn't even stutter if I start the car with my foot on the throttle slightly. When the engine has started it runs perfectly with 0 issues at all.
Even stranger if the issue occurs but I get it to start, and then I turn the engine off and start it up again, it won't struggle to start at all.
This issue first occurred soon after I was doing a coolant flush and I forgot to burp the system to release air pockets and I overheated the car very slightly. Whether this is related to the issue or not I don't know, as I am unsure whether the overheating actually caused any damage.
I have replaced the spark plugs, ignition coils and HT leads since this has happened and it has made no difference.
I can't imagine it being an air leak as it is too inconsistent, so I am wondering if it is something to do with the car not injecting enough fuel ?
This has been bugging me for a while now and I was hoping someone on here might have an answer. Any help is greatly appreciated.
20220301_203018.mp4