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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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[-] psx_crab@lemmy.zip 6 points 4 months ago

If not fuel, not electric, then maybe air? Check the air intake hose (that big one between air filter and throttle body) to see if there's any leak(as in any dry rotten crack), especially if there's an airflow sensor right before the hose, it will cause misfiring because of the inaccurate airflow reading. Then check all the vacuum hose to see if there's any leak.

If it's sensor, it usually will throw a code(and the "check engine" icon will light up) and you can read it using a scanner.

[-] VerilyFemme@lemmy.blahaj.zone 3 points 4 months ago

Got it. Thank you!

this post was submitted on 16 Jan 2026
11 points (100.0% liked)

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