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Re: Loss of power and mileage / low hollow sound from air intake
Usually cleaning the throttle body & replacing the oxygen sensor with a
good quality one solves your problems.Since NGK & Denso make tons of
tune up parts they are readily available anywheres locally and low
priced.
To clean the throttle body remove the air intake hose and examine the
intake and throttle body for excessive carbon build up if found then
buy a can of throttle body cleaner labeled "safe on oxygen
sensors,TPS's and catalytic converters" do not use carb cleaner make
sure your engine is fully warmed up prior to using as when the throttle
body is hot it dissolves the carbon easily and quickly.
The labels usually specify to park the vehicle at ground level (0
degrees,no inclination) and have the engine running but I disagree I
instead park the vehicle on a hill facing down and shut the engine off
and hold a rag below the lip of the throttle body and poor the stuff
and use a tooth brush.
The oxygen sensor is replaced for free in the USA only when the vehicle
reaches it's first 80 000 miles regardless of the age & number of
owners as stated in the factory owner's manual in the maintenance
section,some Toyota dealerships are reluctant to replace it for free if
that happens contact the Toyota regional head office for your region
where they will give your local dealership 48 hours to comply.
On average the oxygen sensors should be replaced every 6 years or 100
000 miles or so which ever comes first as stated in the owner's
manual,warranty booklet and factory service manual.
Symptoms of a bad o2 sensor are poor gas mileage,hesistation in
acceleration,worse emmissions,and in severe cases after the stat opens
the engine can no longer maintain stable 750 rpm (with manual 5 spd
tranny) idle and the engine begins to stall.
The 02 sensor is designed to function once the vehicle has warmed up
which is about after 10 minutes where the thermostat begins to open at
190 or 195 degrees Ferenheit depending on thermostat then the vehicles
ECU system enters what they call a "closed loop system" then the
exhaust manifold's temperature reaches 400 degree Ferenheit (I
think)that's where the sensor starts to do it's job which is usually
when the thermostat first opens up then the oxygen sensor senses the
ratio of air to fuel and sends a signal back to the ECU then ECU
compensates by increasing or decrease the open time for the fuel
injectors to pump fuel.
So usually the problem of stalling shows up after about 10 minutes of
driving or so.Many folks think that the o2 sensor is bad but an exhaust
leak can cause excess oxygen to enter the exhaust system thereby
fooling the sensor into thinking there is too much oxygen,there are
other problems that could cause it to give false reading such as a
vaccuum leak.
If you discover that the o2 sensor is bad and it is not under warranty
then from my/others experience/research purchase an o2 sensor in the
following order:
1)Toyota (NipponDenso now called Denso)
2)Denso aftermarket (Same as original but sold aftermarket)
3)NTK (oxygen sensor division of NGK)
Available at:
[url]http://www.1sttoyotaparts.com/partscat.html[/url] (10% shipping by Fed Ex or
free shipping with $100 & over speak to Roger at 1-888-271-3948
[url]http://www.Toyotaparts4U.com[/url]
[url]http://www.toyotaofplano.com[/url]
[url]http://www.densoaftermarket.com[/url]
[url]http://www.ngksparkplugs.com[/url]
[url]http://www.pythonparts.ca[/url]
Sidney® ™
E-mail:sidneybek@yahoo.com
Dartmouth,Nova Scotia
Canada
1985 Toyota 4-Runner,solid front straight axle,factory cruise
control,sunroof,22R-E,W56,RN60LV-MSEK,rusted rear step/towing chrome
bumper with 252 000 KM
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