Great. Thanks! That means that for the past 30k miles I have been driving
around without these. Wonder why there isn't any codes causing the check
engine light to come on.
Do you know where the hoses start from? I looked, but can't find anything
that's disconnected.
My idle runs right around 750 rpm or so. I'll take pictures to see if it
will help.
Chris
<raymond.irons@gm.com> wrote in message
news:OFDA38AEDF.F3999582-ON85256C8C.003ACF1A@mail.gm.com...
>
>
> Hi Chris,
> I have a 98 with the 3.9 V6 and I don't think there is that much
> difference in our two trucks for only 1 year. The connection you found on
> the back of the air hat I think goes to the PCV valve. I could be wrong
> because I just did a tune up on my truck and I can't remember where the
> hose for the PCV valve goes off the top of my head. I believe if that's
not
> it, look for a hose that is routed to the driver side of the engine and
> you'll find it. If no one else give you a good answer by this afternoon,
> I'll try to run down to the parking lot at lunch and take a look at mine.
> As far as the nipple sticking out of the passengers side of the intake
> manifold, I had the same thing on mine. I found it when I was trouble
> shooting a high idle condition. I found a rubber plug laying along the
> runner at the top of the valve cover next to the manifold. When I tried to
> put it back on, I found that due to age, heat, etc., it had expanded and
> would no longer fit properly. A quick trip to Autozone for some
replacement
> plugs cured that problem. If you leave it off, it causes a slight vacuum
> leak which can affect the idle of the truck. Good luck with it.
>
>
> HTH
> Ray Irons
> Dover, DE
>
>
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