How to replace the exhaust manifold ring in my 91 Toyota Tercel

May have two sensors.
Usually found in the exhaust manifold between engine and catalytic converter under the car's cabin area.
They're expensive little buggers, about $200@ so make sure it's the problem and the right one.
Trouble code may indicate A or B or front or back one if more then one.

Hello,

The knock sensor is usually located in the side of your engine block just under the exhaust manifold. If your standing in front of the car (Since Its Front Wheel Drive) It should be almost in the center directly in front of you.


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run the fault codes and check for servo/solenoid and TCM problems

look on the inlet manifold for a the valve or it could be apart but it will have a pipe connecting it to the exhaust manifold so its easy to locate

yes when replacing a water pump you need to replace all seals,gaskets and o-rings

look underneath the intake manifold towards the drivers side of back of motor.

it goes exhaust manifold, head pipe, cat, intermediate pipe, tailpipe

remove the exhaust manifold with a 14mm. socket and pull off old gasket, may have to be scraped, install new and torque bolts to 33 FT. LBS......... same with intake manifold but 10mm. and 12 FT. LBS of torque and drain coolant.

Usually the O2 sensor will be on the exhaust manifold close to the engine, I'm going to assume you have a pretty good idea of what you are doing so if you need more details don't hesitate to ask.

You either have had the wrong valve seals installed, they are physically missing, or the valves are incorrect (too loose in the guides/stem too thin). The rocker arm seals will not contribute to your issue. If it did not have the oil smoke before you took the head off, the issue is with whatever the machine shop did. Valve seals have to fit TIGHT, or oil will go down the valve stem into the intake.
Take the head back to the machine shop & tell them to fix it. For free.