Posted By: 1970440RT
5.2 intake leak trouble shoot. ??? - 10/16/08 12:55 AM
I have a 318/5 speed 97 Ram with 150k on it. I replaced the intake manifold and plenum gasket at about 110,000 because I was using and saw oil down through the throttle body. Everything is OK until now. I'm using oil again like crazy and it is pinging under load. This time I do not see oil down through the throttle body. I am also getting a surge at idle EXCEPT when the AC compressor is engaged. For some reason the idle smooths out when I hear the clutch engage.
I decided to follow the steps in the TSB to detect a leaky manifold gasket:
1. disconnect breather hose from manifold and attach Vaccuum guage to hose. -done
2. disconnect pcv hose from manifold and pcv. Cap pcv and manifold. -done
3. start engine. do not let crankcase build pressure to more than 3 psi. -done
I have 15" of vaccuum! When I give it some gas it drops to 7-8".
Is this supposed to be 0" of vaccuum? I just want to make sure that the gasket is bad again before I throw money at it.
I decided to follow the steps in the TSB to detect a leaky manifold gasket:
1. disconnect breather hose from manifold and attach Vaccuum guage to hose. -done
2. disconnect pcv hose from manifold and pcv. Cap pcv and manifold. -done
3. start engine. do not let crankcase build pressure to more than 3 psi. -done
I have 15" of vaccuum! When I give it some gas it drops to 7-8".
Is this supposed to be 0" of vaccuum? I just want to make sure that the gasket is bad again before I throw money at it.