please help!!!!!
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Rookie
Joined: Jun 2012
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I would start small first, while replacing the plug wires, grab a flash light and look in the TB, look for standing oil in the bottom of the intake. This usually points to a bad plenum gasket or a really bad PCV valve.
If you find a blown plenum gasket, you may also have a clogged cat as the oil is sent through the engine and absorbed by the mesh in the cat.
This can cause a serious issue with power ect.
To check the cat, pull the forward (upstream) O2, start the engine and see if the engine seems more powerful. That little bit goes a long way if the cat is clogged...
If you find a blown plenum gasket, you may also have a clogged cat as the oil is sent through the engine and absorbed by the mesh in the cat.
This can cause a serious issue with power ect.
To check the cat, pull the forward (upstream) O2, start the engine and see if the engine seems more powerful. That little bit goes a long way if the cat is clogged...
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Should I try the iac again? I did NOT reset pcm when I tried to see if that was the problem
Professional
Joined: May 2012
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From: victorville ca
If replacing the plenum plan on spending a day or 2 not all that hard tho it depends on your skill level. Seems like tou take more time cleaning. You want all thoes parts put back together squeaky clean.
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Joined: Apr 2010
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From: Clayton MI
Mine took four days..... 
That was mostly scheduling issues, and an empty oxygen tank though...
Book says around 6 hours. But, that is for an experienced mechanic. Give yourself the weekend to take care of it.
That was mostly scheduling issues, and an empty oxygen tank though...Book says around 6 hours. But, that is for an experienced mechanic. Give yourself the weekend to take care of it.
2) Yes, if you have it, replace it and unplug the battery for 15 minutes.
3) The PCM will store codes and driving conditions until you force the reset.
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Could it really be something as simple as that? And what was your truck idling at? Also, could that cause poor fuel economy?
