Hiss between manifold and rear VC
Hiss between manifold and rear VC I'm not sure when or where it happened but I've developed a constant hissing air noise coming from what I think is between the intake manifold and the rear valve cover almost dead center. I removed the vacuum line that goes to the top of the intake and put my finger over the hole on the manifold fitting, the noise seems to stop completely. Wouldn't that point to a leak or problem in the PCV system?
I removed the hose completely, checked it for leaks but didn't find anything. Guessing I should remove the rear VC and see what is going on...
The baffles in my valve covers had to be removed for the 1.85 RR install so I'm not sure how that would be impacting me other than just more oil back into the intake, I really need a catch can though...
Whatever is causing it I'm guessing is making me run lean. I've decreased the MAF Airflow Vs. Frequency probably 5% and I'm still running +9 LTFTs at idle, decreasing almost linearly to +2, 3 at higher MAF Freq. Which basically is no change from the %5 I pulled. This is all after I found and fixed an exhaust leak stemming from the clamp on the rear side of the crossover pipe and the clamp further down. I haven't smelled exhaust yet but every once and a while I can smell it come through the air vents...but I'm also catless though which doesn't make it easy.
Any suggestions here? Anything to look for while scanning that may help narrow it down?
I removed the hose completely, checked it for leaks but didn't find anything. Guessing I should remove the rear VC and see what is going on...
The baffles in my valve covers had to be removed for the 1.85 RR install so I'm not sure how that would be impacting me other than just more oil back into the intake, I really need a catch can though...
Whatever is causing it I'm guessing is making me run lean. I've decreased the MAF Airflow Vs. Frequency probably 5% and I'm still running +9 LTFTs at idle, decreasing almost linearly to +2, 3 at higher MAF Freq. Which basically is no change from the %5 I pulled. This is all after I found and fixed an exhaust leak stemming from the clamp on the rear side of the crossover pipe and the clamp further down. I haven't smelled exhaust yet but every once and a while I can smell it come through the air vents...but I'm also catless though which doesn't make it easy.
Any suggestions here? Anything to look for while scanning that may help narrow it down?
