Air puffs IN and OUT from oil cap and valve cover hole to the intake..?

truwarrior · 06-30-2005, 06:06 PM

My car is slow...missing like 50-75HP. I can feel air puffs IN and OUT from oil cap and valve cover hole to the intake... Is this normal?

When I boost leak the car I I can fill past 15psi but it slowly leaks out from where I don't no besides if I remove the oil cap I can hear air hissing and pressure build up in the valve cover. It takes about 20 secs or so for it to drop from 15psi to 0 psi.

150,160,150,150 compression
no smoke out the exhaust
PVC leaks very slightly but when blocked off the air still got into the valve cover area.

just_passed_you · 06-30-2005, 06:51 PM

Sounds like a boost leak to me.

Thomas91169 · 07-01-2005, 01:48 AM

replace PCV valve. 3 bucks, then see how it does.

DGajre777 · 07-01-2005, 01:51 AM

Quote:

Originally Posted by Thomas91169

replace PCV valve. 3 bucks, then see how it does.

I agree

Defiant · 07-01-2005, 03:28 AM

Quote:

Originally Posted by just_passed_you

Sounds like a boost leak to me.

Please eesplain to us how a boost leak can find its way into the camshaft cover/crankcase

99gst_racer · 07-01-2005, 10:05 AM

Why is this in the Turbo System Tech forum?

truwarrior - When you do a boost leak test and you get around 15 psi, do you here a noise that sounds like blowing bubbles in your chocolate milk?

oldman · 07-01-2005, 10:35 AM

Move the tester to TB elbow. If hissing stops, air is going through turbo seal > oil return > oil pan (No biggie if you're not smoking). If problem persists with the pcv plugged, it's either piston rings or valve seals. Repeat the compression test and a wet test immediately after to help rule out the rings.

just_passed_you · 07-01-2005, 11:19 AM

Quote:

Originally Posted by Defiant

Please eesplain to us how a boost leak can find its way into the camshaft cover/crankcase

Don't drink and post.

I thought it sounded like blow by.
Loss of power, pressure in crank case, rings?

I hope it's just the PCV

truwarrior · 07-01-2005, 12:40 PM

Quote:

Originally Posted by 99gst_racer

Why is this in the Turbo System Tech forum?

truwarrior - When you do a boost leak test and you get around 15 psi, do you here a noise that sounds like blowing bubbles in your chocolate milk?

Yes but I was told it's because there is no oil pressure since the engine is off. I wouldn't say it's like blowing bubble in milk but maybe like fat rain drops lol. Still leaks if attached to the throttle body elbow.