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John Stewart

4x4Wire Toyota Tech Archive

4x4Wire Toyota Tech Archive

John Stewart

Brake Booster Replacement

Brake problems can manifest themselves in a number of ways. Shoes or pads can wear out, leaks can develop in the master or slave cylinders, or the power booster on a power brake system could fail. In this case, the problem was the brake booster leaking vacuum on a 1994 Land Cruiser FZJ80.

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John Stewart

Toyota Hydraulic Clutch Assembly Maintenance

Remove the lower portion of the dash (four 10MM bolts on a third generation 4Runner) and the associated wiring plugs, cables, etc. Take care to list or photograph the assemblies in the assembled condition if you feel that you can't keep track of "what goes where." Removing the panel is necessary unless you have the hands of a three year old and the arms of Manute Bol.

Remove the cotter pin holding the cross pin through the clutch pedal and push the cross pin through the pedal assembly. You may need to depress the pedal slightly to release the tension off of the cross pin. Retain the cotter pin and the cross pin, these will be re-used in the replacement process.

Click here to read more about Toyota Hydraulic Clutch Assembly Maintenance

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John Stewart

Toyota 3.4L V6 Timing Belt Replacement

To do this successfully at home you will need an assortment of hand tools, a 250 foot pound torque wrench, Snap-On tool number YA9730, a special tool to hold the crankshaft pulley, help from a friend, and considerable experience working on vehicles. The factory timing belt is less than $50, but most owners want to replace the water pump, thermostat, and all the drive belts such as the alternator, power steering, and air conditioning (if equipped). These additional parts, along with supplies such as coolant and sealant will put the total cost close to $200, which is typically about fifty bucks less than what a dealer would charge to replace just the belt.

Click here to read more of Toyota Maintenance: 3.4L V6 Timing Belt Replacement from the 4x4Wire.com archives/

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John Stewart

Time to Replace the O2 Sensor on your 3rd Gen Toyota?

If you are not familiar with the OBDII (On Board Diagnostic generation II) systems used on 3rd generation and later Toyotas, you might want to read this reference before proceeding further in this article. As described in the reference article, the oxygen sensor in the exhaust system is the key "feedback" sensor for correcting and maintaining the proper fuel mixture. It measures the post-combustion gases to determine the actual air/fuel mixture of the prior combustion cycle and then, the ECU adjusts the fuel trim percentage on the next combustion cycle, to keep the fuel mixture at the optimum value.

As the oxygen sensor ages, its responsiveness begins to slow down. Since I have a BR-3 OBD-II scanner that can read the voltages generated by the O2 sensor, I thought I would be able to see some indication in the voltage signal that my O2 sensor was not providing optimum performance. However when I examined the O2 Sensor Output with the engine idling, it appeared to be pretty much the same as I had seen when the vehicle was new. Also, the error codes applicable to the O2 Sensor had not shown up and turned on the Check Engine light.

However, if the Check Engine Light were to turn on with one of the following O2 Sensor codes stored, you should follow the diagnostic procedure and replace the O2 sensor if so indicated in the diagnostic procedure.

Read more of Tech: Time to Replace the O2 Sensor on your 3rd Gen Toyota? in the 4x4Wire.com Archives.

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