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2009 Corolla 1.8L rough start and shudder
(lemmy.blahaj.zone)
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this post was submitted on 16 Jan 2026
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Mechanic Advice
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Codes run misfires and a bunch of random shit. I don't have a code reader myself, but I can borrow one. My mechanic fixed a wiring issue recently that I thought caused the issue, but I guess not.
Any ideas on what the wiring issue was? Could be a clue as to what is going on now. Especially if it started after the last issue was fixed. Could be as simple as something left unplugged. I have done that more than a couple times working on my own vehicles.
It started before that, but one day wouldn't start. Fixing the wiring helped get it started again, but it still rattles.
If you can pop into an Autozone or place like that they can read codes on all modules; just don't listen to their diagnosis. When you get the list of codes, DM them to me and I can see if I can find some common fixes on them
Thank you. It may be tomorrow before I can get up there but I will.
Is the check engine light on while driving? If so, does it stay on solid or start flashing after a bit?
Yes, and it's solid.
In a way that's good. If it starts flashing while driving, that means you are probably destroying some expensive catalytic converters.
But that being said, if the light is on, a list of active codes will help us help you tremendously. Most all major parts stores will check your codes and give you a printout to take to your mechanic for free.