PCV question...mines MIA
08-15-2010, 12:43 PM
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PCV question...mines MIA So Im doing repairs and upgrades and couldn't locate my PCV valve. After asking the question Ive looked but to no avail. It appears as though the previous owner deleted it all together and simply stuck the hose directly to the intake manifold (fast 90). I recently took my fast 90 off to replace hardware, clean it inside and out and install my fast fuel rails. While its off I decided to do the LS6 PCV mod as described here: http://www.ls1howto.com/index.php?article=18
I guess the question is since I don't have the PCV valve with what looks like a grounding strap or lanyard or the original PCM coupler to make it work as described in the above link (3rd picture from the end) can I just install and PCV that will allow the hoses to mate correctly? What is the purpose of the valve? Is it only open when pressure inside is positive? Its hard to know whats going on when my current setup is missing it all together. Before you ask, yes my manifold is covered in oil and I consume it at a hellish rate.
I guess the question is since I don't have the PCV valve with what looks like a grounding strap or lanyard or the original PCM coupler to make it work as described in the above link (3rd picture from the end) can I just install and PCV that will allow the hoses to mate correctly? What is the purpose of the valve? Is it only open when pressure inside is positive? Its hard to know whats going on when my current setup is missing it all together. Before you ask, yes my manifold is covered in oil and I consume it at a hellish rate.
08-15-2010, 04:12 PM
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Can't answer the how to part, but the purpose of a pcv is twofold:
1. Provides positive ventilation to the crankcase (Positive Crankcase Ventilation) so as to evacuate any combustible gases that may be present. That's why it's plumbed to the intake (or air cleaner on an older car, but can be routed to the intake also).
2. Acts as a check valve in the event of a backfire so you don't ignite any combustible gases in the crankcase.
It was preceded in life by the road draft tube, which did the same thing but you had to be going over 30 mph or so to make it work. Air flow past the end of the tube created a vacuum on the crankcase.
PCV's have been federally mandated since 1963.
1. Provides positive ventilation to the crankcase (Positive Crankcase Ventilation) so as to evacuate any combustible gases that may be present. That's why it's plumbed to the intake (or air cleaner on an older car, but can be routed to the intake also).
2. Acts as a check valve in the event of a backfire so you don't ignite any combustible gases in the crankcase.
It was preceded in life by the road draft tube, which did the same thing but you had to be going over 30 mph or so to make it work. Air flow past the end of the tube created a vacuum on the crankcase.
PCV's have been federally mandated since 1963.
08-15-2010, 04:44 PM
#4
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Don't know if this helps, but #9 is the stock PCV location for 98.
http://img33.imageshack.us/img33/913/1998hoses.gif
http://img33.imageshack.us/img33/913/1998hoses.gif
08-16-2010, 05:26 AM
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Don't know if this helps, but #9 is the stock PCV location for 98.
http://img33.imageshack.us/img33/913/1998hoses.gif
http://img33.imageshack.us/img33/913/1998hoses.gif
08-16-2010, 03:13 PM
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take the plastic grommet out of the block, it twists out, it's hard tho, but mine had no pcv valve but i put one in and it plugs into the top near the hose.
