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Car bogs down when under a load

Tiny
BIBLEGEEK
  • MEMBER
  • 2001 TOYOTA COROLLA
  • 277,000 MILES
Car bogs down when under a load. 1st gear seems to be ok - 2nd gear, going around corners and steady acceleration really has some hesitation and bogging down. Occasional horrid bogging down in 1st gear after coming to a complete stop. Here's what I have done thus far:
- new plugs
- new air-filter
- new MAF sensor
- new CAT
- new O2 sensors
- thorough cleaning of throttle body

Bogging down didn't begin happening until I had the CAT and O2 sensors replaced. O2 sensor was replaced since then, same problem. I'm thinking it could be the fuel filter, fuel pump, or the ignition coils. All are original. Would the fuel pump or ignition coils show up in an error code?

Anyone have any ideas on where to go from here? Has anyone seen anything like this before? If so, how did you fix it? Thanks
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Friday, January 4th, 2013 AT 12:54 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Fuel pump and ignition coil would not throw codes. Only misfiring codes might be present. Are there any trouble codes?
If the O2 sensors are not OEM, they can cause problems. Use a scan tool to monitor its operating range and see if it is within specifications.
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Friday, January 4th, 2013 AT 3:20 PM

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