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rpmdiag
rpmdiag, Tech and Instructor
Category: Toyota
Satisfied Customers: 6874
Experience:  Since 1975
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2007 Toyota Yaris Car runs but at times looses power while

Customer Question

2007 Toyota Yaris Car runs but at times looses power while driving..No codes
Submitted: 4 months ago.
Category: Toyota
Expert:  rpmdiag replied 4 months ago.

Hi, I’m Ron and I’ll be helping you today.
Before we get started though, Please understand that I don't know
your skill level or tools you have to assist us. Also understand that
I can't see, smell, hear, or touch the vehicle either, so patience is
appreciated. JA is a great Q/A site, but it does NOT replace a
repair shop.
My goal is to make you happy and get a great rating in return for
my time. Sometimes I have to give you bad news that I know you
didn’t want to hear, so please don’t shoot the messenger.

It's possible that the fuel pump is getting weak. You should test the pressure with a gauge, and if possible test the pump armature with a lab scope. That would be an even more conclusive test.

Thanks, Ron

Customer: replied 4 months ago.
It runs great until it starts to loose power. I drove it 7 miles before any issues.
Customer: replied 4 months ago.
there isnt a fuel filter or any ports to check fuel pressure.
Customer: replied 4 months ago.
Have you had any experience like this with Toyota yaris's
Expert:  rpmdiag replied 4 months ago.

I understand. A fuel filter being plugged will cause your problem ALL the time. The fuel pump can intermittently fail though.

thanks again, and please don't forget to rate me and keep this link in case you need me again later on. I am very experienced with this.

Ron

Customer: replied 4 months ago.
Ive had a lot of suggestions, but without an area to hook up a gauge when it happens how can I be sure?
Expert:  rpmdiag replied 4 months ago.

We have to do some testing at some point, and this same problem was in my shop 3 months ago with a bad pump.

Ron

Customer: replied 4 months ago.
Just got off phone with son and he had fuel pump replaced by shop 6 months ago
Expert:  rpmdiag replied 4 months ago.

Great, what's the fuel pressure reading on the new pump?

Ron

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