2009 Corolla 1.8L rough start and shudder (lemmy.blahaj.zone)

submitted 4 months ago by VerilyFemme@lemmy.blahaj.zone 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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[-] seathru@quokk.au 1 points 4 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.

this post was submitted on 16 Jan 2026

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