u/Stingray_Nash

I love my car, been driving it for 6 months, but the previous owner was not a good owner at all. For maybe 1 month and half, my 2007 Toyota Yaris hatchback (240630 miles) randomly stumbles ONLY when slowing down/braking and RPMs drop near idle. Never really happens under acceleration.

Started with a P0301 and a bad coil, replaced plugs + coil. Since then I cleaned CKP/CMP sensors, replaced clogged PCV, fixed loose coil connectors, oil change (also fixed the carter since previous owner fcked the screw), cleaned throttle body (recently). Also, while the vehicle was running, I checked that any wire or electrical part is loosen.

The weird part is sometimes it drives PERFECTLY for hours, mostly happens hot/daytime, CEL comes on solid during the stumble, then the car recovers and keeps driving normal, acceleration is actually strong/smooth most of the time. Car has never had issues with overheat tho.

After cleaning the throttle body, throttle response improved immediately and so far the stumbling seems reduced. I cleaned it today, HOPING by tomorrow is good to go while go to work (I’ll keep updated)

Anybody with a 1NZ-FE experienced: stumble during deceleration only, random CEL during RPM drop, and then, normal driving afterward?

Trying not to throw random parts at it 😭

Hi there! I’ve been driving this Yaris for almost 6 months now, it was a used car, so lately I’ve been working on some stuff. Anyways, I didn’t drive it for maybe 1 week and half because I was having issues with the carter, CPK and ignition coil (all fixed now, thankfully), but I started to get this annoying sound recently and I’m trying to figure out what that is exactly. This is my first car, and I’ve learned a lot about it, but before doing something I rather to ask y’all if you can help me, if I can fix it or check it by myself, or if I need assistance with my mechanic. Thanks!