Possible vacuum leak
check all vacuum hoses including vent control hoses and transmission actuator hose
SOURCE: how can I maintain a 1AZ Toyota engine to last
I have a Corolla which we call "old faithful". It has never missed a beat except twice when we had to replace the battery.
During this time I have had an Isuzu which doesn't run anymore, a CAM (Chinese pick up) which I sold, thank goodness, and I presently have a Mahindra Scorpio truck, but old faithful will never be sold. I have pledged it to my grandson for when he gets his drivers license.
Frankly, we don't touch the engine. Every 20 000 km I replace the filters, drain and replace the oil and the spark plugs and that's it, unless I forget and just let it run another 20 000 km.
SOURCE: what is dtc code 98 in my 1az-fe toyota nadia
My engine starts but does not accelarate. Im using Toyota nadia d-4
on one of the forum ages code p 1653 refers to SC V motor circuit
toyota recommended the change of both vacuum valve assembly parts T25860, -OHO30 and T25860-28070
the c person asking the question replaced the units and to date the problem was fixed
go google and type in --toyotanation.com as this is a forum page and most replies state that it is a vacuun valve assembly problem
one person had this to say the following malfunctions were experienced
VCS, VCSoff and engine check light on
the gear is alternately was stuck on overdrive --stay at the 3rd gear ( the od light not on)
the computer code reported a p1653 malfunction code
after replacing the vacuum valve assembly the symptoms went and haven't come back
any way go google and type in-- fault code p 1653 for toyota --and search pages to get a better understanding of what is wrong
SOURCE: 1az engine idles but not acceleration.engine cuts when pedal pressed
that can possibly be a accellerator pedal fault or a faulty tps throttle position sensor that is mounted to the throttle body
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