Question about 1990 Toyota 4Runner

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Timing will not set when i set tdc

Applied info from manual it tries to start and dies

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Timing could be 180 deg out meaning your trying to fire on the exhaust stroke instead of the ignition stroke? cheack that your cam timing is right if you have had the timing belt off ? reset to top dead center then make sure you are on the right stroke

Posted on Aug 03, 2009

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How TDC related to timing


TDC stands for 'Top Dead Center', and refers to the first piston and the harmonic balancer: with the spark plug removed in the first firing cylinder, you turn the harmonic balancer till it tops out (the piston-you can use the eraser end of a pencil, sticking it down till you feel it hit) when accomplished you set your mark and that is your TDC now you adjust with a timing gun/light using that mark. This is always nessecary when engine has been changed, altered or rebuilt, because stock specs no longer apply. . .

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To set the inital timing remove the valve cover first. As you turn the engine over by hand watch the operation of the valves. As the timing marks come up on the O the intake valve should be closing. At the O you are on Top Dead Center (TDC). If you go past TDC the exhaust valve should start to open. If this is what you see, then you can line up your distributor with the #1 spark plug and wire your cap from there. It this is NOT what you see then turn the engine over 1 complete turn back to TDC and you should see it happen this time. The crank turns twice to every 1 turn of the camshaft.Now insert your distributor and go from here. Snug the distributor and fire up the engine, use a timing light and set to the third mark ahead, that would be the direction the pulley is turning. Hope this helps.

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I have a 55 plate grand scenic 1.6. I have had mant problems with it. The coils have already been replaced and i have a constant problem with it not starting. I've never had such an unreliable car. When...


Coils are a common problem, sorry to say.
There are a few potential things to replace. But its expensive guess work.
I would bite the bullet and visit a Renault dealer.
It could be:
1. TDC sensor. TDC stands for Top Dead Centre. If the igition does not get a signal from this sensor it does not know when to ignite the fuel.
2. Sometimes the temp sensor that tells the ignition how warm the engine is can fail. If the ignition gets a false reading or no info it will assume a set value. This can make the car try to start as its got the "Choke on" and if the engine is semi warm it will not allways start first time.
3. There are loads of other sensors that can fail and cause it not to start.

As you say it will do this at any time, is it its mainly when the engine is hot or warm?

When the car is working does it drive ok, or does it have a lack of power?

Let me know.
Simon

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