A possible crankcase leak
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Joined: Oct 2005
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From: Tampa
Car: 91 Z28
Engine: 350 TPI (L98)
Transmission: 700R4
A possible crankcase leak
I believe the idling problem I have been having may be due to a crankcase leak between the intake manifold and the block. How would I test this? Would plugging both PCV holes and checking for improvement be an affective way?
Last edited by joe350; Jan 7, 2006 at 07:35 PM.
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From: Yuma, Arizona
Car: 1991 camaro RS
Engine: 350,vortech heads,zz4 cam,3:73 posi trac,edelbrock carb,wiend stealth intake,raven mufflers,hooker supercomp shorty headers and y-pipe.
Transmission: th700r4
Hook up a smoke test
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From: Austin
Car: 82 Z-28
Engine: 383 TPI
Transmission: 700R4
A leak between the intake and the block won't cause a perf problem. It will leak oil however.
If you mean a leak between the intake and the heads, that can cause an "internal vacuum leak". You can check for that by plugging the pcv hole and the breather hole on the other valve cover; start eng and check for vacuum building in the crankcase.
I've done this test using the palms of my hand to plug off the pcv valve and breather holes. It's a lot more comfortable on a cold eng.
If you mean a leak between the intake and the heads, that can cause an "internal vacuum leak". You can check for that by plugging the pcv hole and the breather hole on the other valve cover; start eng and check for vacuum building in the crankcase.
I've done this test using the palms of my hand to plug off the pcv valve and breather holes. It's a lot more comfortable on a cold eng.
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