marascholz52
MarkX Cold Start Rough Running
Summary of the thread
A 2016 Toyota MarkX is experiencing poor starting and rough running during cold starts. The issue may be related to the cold start injector, as the fuel rail and injectors have not been serviced. Possible causes include engine misfires or a faulty injector. Solutions suggested include checking for misfires, cleaning the injector, or potentially replacing a defective injection valve. Seeking professional mechanical assistance is recommended to accurately diagnose and resolve the issue.
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4 comment(s)
marascholz52 (community.author)
Misfires, huh? I haven't specifically checked for those, but the rough running is definitely there. If it is the injector, is it likely a simple cleaning job will fix it, or am I looking at replacement? I was hoping to avoid fuel injection work.
alexanderfire7
Cleaning might help temporarily, but if it's a defective injection valve, a new injector is probably the only real fix. I ended up needing a new one. Cost me about 515€ all in at the workshop. Just get it checked out; saves a lot of guesswork.
marascholz52 (community.author)
Thanks for the info! Sounds like I'm headed to the shop then. At least I have an idea what to expect now. Much appreciated!
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TOYOTA
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MARKX
alexanderfire7
Poor starting and rough running when cold, eh? Sounds familiar. I've got a MarkX myself. Did you check for any engine misfires? Could be a faulty injector. Have you considered taking it to a mechanic to check the injection valve?