Header Leak --> Lean Condition?
Thread Starter
Launching!
Joined: Nov 2001
Posts: 203
Likes: 0
From: Chesapeake, VA
Header Leak --> Lean Condition? I am still battling a slight pinging problem with my car. Mostly during low RPM tip-in on the throttle. I have ordered an SLP manual fan switch, an SLP increased-cooling radiator, and some water wetter which I will add to an 85%/15% (water/glycol) mixture. I am hoping this will show lower operating temps by 15-20 degrees over what I have now.
Next suspect...header leak. I have also purchased new GM manifold gaskets (the stock metal crush-type) and new Stage 8 locking bolts. Can a header leak allow enough unspent oxygen to escape detection by the O2 detectors to cause a lean condition? That's the big question. Does anybody have a definitive answer on this?
Thanks guys. <img src="graemlins/gr_hail.gif" border="0" alt="[hail]" />
-Kris
Next suspect...header leak. I have also purchased new GM manifold gaskets (the stock metal crush-type) and new Stage 8 locking bolts. Can a header leak allow enough unspent oxygen to escape detection by the O2 detectors to cause a lean condition? That's the big question. Does anybody have a definitive answer on this?
Thanks guys. <img src="graemlins/gr_hail.gif" border="0" alt="[hail]" />
-Kris
TECH Enthusiast
Joined: Jan 2002
Posts: 597
Likes: 0
From: Orange Park, FL
Re: Header Leak --> Lean Condition? I may be wrong but I was under the assumption that an exhaust leak forward of the 02 actually caused a rich condition. Thats how it happened on my 96 S-10. Finally fixed the leak and SES light went out and I picked up 3-4 MPG.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: Header Leak --> Lean Condition? It'll cause the PCM to *THINK* there's a lean condition that really isn't there which in turn will make for a rich condition since the PCM will be adding fuel.
