2000 Toyota Corolla

[StevieC]

Ok Toyota experts... Need some help here...

A friend of mine has a 2000 Corolla with 150K KM (90K miles) and it's storing code P0171.

The car also has a slight hesitation when snapping the throttle both hard and lightly...

Car gets reasonable fuel economy. All the obvious things were checked. (PCV, Plugs, Wires, Fuel/Air Filters).

The car has quite the carbon buildup on the exhaust.

Car also burns about a quart of oil every 2K KM's (1.2K Miles)

Car passed emission test 1 year ago but almost failed on the CO. The NOX were non-existent, and the HC were low.

Car has excellent compression.

I'm thinking leaky injector, bad 02 sensor (even though that isn't the code), or MAF/MAP sensor (Don't know which this car has yet)

Looking for input from people familiar with Toyota's.

Cheers,

Steve

 

[Drew99GT]

MAF sensor.

http://www.obdii.com/ubb/Forum1/HTML/001906.html

Clean the hot wires carefully with a q-tip dipped in rubbing alcohol.

 

[StevieC]

Drew,

I read this before... The MAF was cleaned by me and now I'm thinking it might be defective if not the 02 sensor. I didn't have the 02-Sensor ratchet socket with me to take it off and look at it to see if it was plugged with carbon before testing it...

 

[deven]

Welcome back Stevie!

 

[StevieC]

Thanks...

 

[deven]

I had a similar situation in my old Lexus and it was a bad 02 senson.

 

[StevieC]

That's what I'm thinking given the miles and the excess gas usage leaving a carbon ring on the tail pipe along with poor acceleration...