Just bought a 2007 Yaris hatchback and have some questions

[Chip Whitley]

I guess the reason I'm so concerned with the power of my Yaris stems from the Ford Ranger that I drove for years. It was a 4 cylinder with over 350,000 miles and it got so slow I ended up taking it to my local mechanic before I sold it. He concluded it was only making maybe 70-75 hp and was simply wore out. My Yaris feels about the same power wise. I can't really get going fast enough to pass other vehicles on the highway and going up this big hill next to our home is a major struggle.

Pedal to the floor I can barely climb the hill at 5+ mph. I know this might sound odd, but I’m actually fine with the car being slow since the gas mileage is so amazing. At the same time though if something is wrong, I'd love to know so I can get it taken care of. Should I just schedule an appointment with my mechanic to ease my mind?

[David C]

Originally Posted by Chip Whitley

I guess the reason I'm so concerned with the power of my Yaris stems from the Ford Ranger that I drove for years. It was a 4 cylinder with over 350,000 miles and it got so slow I ended up taking it to my local mechanic before I sold it. He concluded it was only making maybe 70-75 hp and was simply wore out. My Yaris feels about the same power wise. I can't really get going fast enough to pass other vehicles on the highway and going up this big hill next to our home is a major struggle.

Pedal to the floor I can barely climb the hill at 5+ mph. I know this might sound odd, but I’m actually fine with the car being slow since the gas mileage is so amazing. At the same time though if something is wrong, I'd love to know so I can get it taken care of. Should I just schedule an appointment with my mechanic to ease my mind?

Something you could try is reset the computer to start over the "learning" of the engine fuel control. Basically since the computer monitors and adjust the engine parameters to match the car to the environment it's being driven in, it may have been in a bad loop from the previous owner's doing. You would reset it when changing or modifying components like the air intake, turbo, etc so it can learn to optimize itself to the new parameters.

To do it, simply unplug the battery for at least 10 minutes (could be less, I don't remember exactly, hopefully someone will confirm if you can wait less than that), then plug it back on. Set your clock and radio settings and the car should respond like the day it came out of the factory, throttle-wise. After an few hours of driving, it should have completed its learning and then you could compare how it drives on roads you've been concerned about the performance so far.

Speaking of air intake, is the filter clean ? Are all hose clamps tight, no tears in hoses, etc ? Make sure the hand brake isn't sticking either. Check your tire pressure and size to make sure it's in check with what the car should be equipped with (specs on the sticker of the driver's door pillar). Check your tail pipe for obstructions.


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