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rpmdiag
rpmdiag, Tech and Instructor
Category: Toyota
Satisfied Customers: 6877
Experience:  Since 1975
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I have a 1999 Toyota Avalon with the 3.0L six-cylinder

Customer Question

I have a 1999 Toyota Avalon with the 3.0L six-cylinder engine with California emission. I was driving down the highway and had the cruise control on and all of a sudden it started to decelerate. So far I've cleaned out the EGR valve, put in new spark plugs, put a new mass airflow sensor in, changed the rear catalytic converter and none of this has fixed the problem. It idles fine when it is cold but after it warms up it will not accelerate. The car has 364,000 miles on it. Any idea what it could be?
Submitted: 16 days ago.
Category: Toyota
Expert:  rpmdiag replied 16 days ago.

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

Expert:  rpmdiag replied 16 days ago.

The fuel pressure needs to be tested with a gauge first on a cold engine, then when it is acting up. It's possible,that the armature is getting hot causing less fuel flow.

You can get a gauge from most parts stores for just a deposit.

Thanks, Ron

Expert:  rpmdiag replied 15 days ago.

If you are satisfied with my answer, I would greatly appreciate a 5
star rating now and I will still assist you after you have rated me
too if another question pops up. I don’t get credit for helping you
until you rate me.
Thanks again, Ron

Customer: replied 13 days ago.
The fuel pump tested fine. They now believe the oxygen sensors need to be replaced. I don't think that is the problem because I was going down the highway with the cruise control on and then it just started to decelerate I believe the problem is something simple
Expert:  rpmdiag replied 11 days ago.

You're right,O2 sensors won't cause that.It sounds like they're guessing. You may want to try a better shop to diagnose this.

It sounds like it's going into limp mode.

Thanks, Ron

Expert:  rpmdiag replied 10 days ago.

If you are satisfied with my answer, I would greatly appreciate a 5
star rating now and I will still assist you after you have rated me
too if another question pops up. I don’t get credit for helping you
until you rate me.
Thanks again, Ron

Customer: replied 9 days ago.
I'm taking it to the Toyota dealer. Because you didn't help with diagnosis, Will I be still be charged for your advice?

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