GMC SKI

i have a 2002 gmc sierra 5.3l in it i have a ATI Procharger runnin 8-9 psi .
i've had my oil dipstick blow open and squirt oil all over my engine under full throttle .
truck has 3500 miles on it 1000 of them with the procharger on it everything else is stock except for a BBK throttle body . The only thing different since i've had it installed are some new ngk tr6 plugs and msd wires.I also found that the dude who did the install missed a gear clamp on the throttle body thus was leaking air at full boost ...made a difference to feel all the boost ..
Any ideas on what i might have blown up ...
the truck idles and runs just fine no loss in power no engine lights either ??
I'm Baffled <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

Mongoose Z-71

What causes that is pressure in the crankcase. Could be a faulty PCV valve or even worse piston rings

oxidizr

iTrader: (4)

Somehow you are pressurizing the crankcase. First thing to check would be you vaccum and PCV system. You may have a clogged or non-functional PCV valve or some kind of pressure back feed into the crankcase.

Richard

GMC SKI

Think it might be piston Rings ??
if it is how can i beef things up any suggestions ?

Mongoose Z-71

Heres a check you can do
Low compression in one or more cylinders can be caused by many possible failure modes. Here's a diagnostic procedure to isolate the culprit.

Could be caused by: 1. Cracked head. 2. Blown piston 3. Cracked Block 4. Blown head gasket 5. Broken valve component - spring, cracked seat, bent valve, bad lifter

Make an air fitting out of an old sparkplug with the guts removed. Remove the valve cover for that head. Check for a hung up valve by removing the rocker arms for both valves and observing the height of the valves - should be equal.

Insert the air fitting in the spark plug hole and add compressed air - the piston will be forced to the BDC position so watch your hands as the crank rotates.

Now listen for a loud hissing from one of the following: 1. Crank case 2. Intake manifold 3. Exhaust pipe 4. External cylinder head/block interface

Wherever the hissing is coming from will tell you where the compression is going.

RedDog

With 3500 miles on your truck,,, I think it is save to say that the PCV and piston rings are just fine <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" /> You do have the vacuum line on the blowby valve hooked up?? And if yes,, is it a good vacuum source?

Mine blew out once, I think I forgot to push it down in when checking the oil.

Now if I could just figure out my fuel pressure problem <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />

RedDog

GMC SKI

i gotta go over the install again maybe a vacum line is kinked or off somewhere i was changin the plugs and wires this morning ..lets hope that's all it is
if it was a ring or piston crack i would feel it ?

ZBass28

As someone that has been running a Vortech on an LT1 for about 4 years I can honestly say that if you are blowing the dipstick out it is not good.

That would be considered excessive crankcase pressure, more than you would see just from a malfunctioning PCV. As soon as I saw this thread the first thing that popped into my mind was that I hope the person posting isn't a blower application. The few LT1s that I have seen that have blown the dipstick out of the tube have all had some serious ringland damage.

I guess I would start with some sort of compression/leak down test to see how everything checks out.

RedDog

GMC SKI,
I'm curious as to what fuel pressure you are running?
In my opinion you would be wasteing your time doing a compression test,,, this is not needed!! I'm betting on your vacuum line is off.

When I first installed my ATI, I had the vacuum line going to the PCV valve. That was when my dipstick blew out, but I also had checked the oil and am sure I did not push it down all the way.

My truck is a 7.4 liter, I found a plug in the intake that I took out and installed a fitting in. I hooked a vacuum gauge up to it and had a very good source.

If you are worried about pressure inside the motor,,, go with Evans Cooling. It will relieve a lot of pressure within the motor. Very easy to install,,, just dump your cooling and flush it out very good,,, then add Evans Cooling to your radiator and switch radiator caps to a ZERO pound cap. Evans Cooling does not have to be pressurized!!!!,,, thus relieving strain on gaskets, hoses.

RedDog

<small>[ May 19, 2002, 08:24 AM: Message edited by: RedDog ]</small>

GMC SKI

ok Lets start with where is the Pcv located and it if it was not functional how could i tell ?
I feel dumb asking but i wanna figure this out myself ..would i bad pcv cause a rough idle when i first start up followed by smoothing out after 15 seconds?
could i hear anything that would tell me it's the pcv ?
trying to play detective here
thanks For all your Help
Oh by the way anybody ever used the Evans coolant ?Specs look good
jim

<small>[ May 19, 2002, 07:14 PM: Message edited by: GMC SKI ]</small>