I changed the rear vavle cover gasket.Had to pull the upper intake off to get to it put every thing back like it was. Started it up and it died. I cfanged the fuel filter and it ran a little longer and died. i dont have a clue of whats worng.
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this is relatively easy unbolt the cover from the head (this usually requires a 10 milimeter socket)once unbolted pull the cover off make sure you clean the old gasket off the cover and the head glue the gasket back to the cover and reverse the process used to take it off be careful not to over tighten the new gasket so as not to split it and cause it to leak.
There is not a PCV valve on the 4cyl.
6 cyl. is located under hood, center, upper engine area, mounted in rear valve cover
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The upper intake has to be taken off to get to them. Yes it is a pain in the but, not too hard to do, just bothersome to do this to be able to change plugs. Make sure to be careful when loosening the intake as the head is aluminum and you can damage it if you take a gung-ho approach. You will need to replace the gasket but it is only around 12 -15 $ .
Check the vacuum line from the brake booster to the intake for leaks or missing/ loose clamps. If it's all intact, look around the booster (big bowl looking thing on the firewall) for leaking brake fluid. If the booster is leaking, it will have to be replaced.
The best way to remove the rear valve cover is to remove the intake plenum. There is really no other way to do it. It is not a hard job, removing the intake plenum, but, trying to tackle the rear cover without taking off the plenum is almost impossible. If he does remove the plenum, make sure he replaces the plenum gasket. Hope this helps.
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I assume that it is starting & idling OK, yes?
First, please look and be certain that the air intake tube that attaches to the end of the intake manifold is not loose, but really tight & secure, and make sure that there are no cracks anywhere on this tube. Secondly, if you do not have genuine Toyota plugs in your engine, you may encounter problems, replace them with the correct plugs. Third, replace the wires if they are over 5 years old.
Fourth, look for any vacuum lines that may be disconnected or crossed.
These are the usual causes, hope this helps.