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2009 Corolla 1.8L rough start and shudder (lemmy.blahaj.zone)
submitted 7 months ago by to c/mechanicadvice@lemmy.world
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Hey all, my wife's 2009 Corolla has been taking a few turns to start. There's misfires in every cylinder, and the engine shudders.

It was running fine when we got it around a year ago, and the problem slowly came about. I've replaced every ignition coil and spark plug, and they're all firing fine. Then I thought it was oil getting into the spark plug wells, so I attached a straw to a shop vac and stuck it in each one (not much came out), then replaced the valve cover gasket.

It seems to be a fuel issue, but my fuel pump seems fine. I was thinking maybe it's sensors, but I'm really lost and I have got to keep this vehicle running! Any advice would be welcome.

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[–] [S] 4 points 7 months ago (3 children)

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.

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  • [–] 3 points 7 months ago (1 child)

    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.

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  • [–] 2 points 6 months ago (1 child)

    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

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  • [–] 1 point 6 months ago* (last edited 6 months ago) (1 child)

    Is the check engine light on while driving? If so, does it stay on solid or start flashing after a bit?

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  • [–] [S] 1 point 6 months ago (1 child)

    Yes, and it's solid.

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  • [–] 1 point 6 months ago

    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.

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