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brucepick · 06-11-2009, 06:28 PM

Further developments.
The car now will enter and stay in lean burn well below 65 mph.

The morning of June 8 I heard an exhaust leak up front, so I took it to Monro Muffler (franchise). Cat converter/exhaust manifold combination was OK but they replaced everything behind it. I also removed all the remaining lower grill block which was mostly on the cat converter side of the grill as I didn't want them to get in a twist over it.

With those changes, it now goes into LB and stays there just as I'd earlier worked out. Warmed up, TPS below 20. Will stay in LB unless TPS goes over 32.

I don't know yet if I'll need to replace the lower cat-side grill block when the weather gets cold or rainy. We'll see. For now I'm a very happy camper because it will run in LB at the drop of a hat. Unfortunately I'll never know if the cure was the exhaust fix or the removal of the grill block.

Sorry for the red herring info earlier.

06-11-2009, 06:28 PM	#14 (permalink)
brucepick Hypermiler Join Date: Dec 2007 Location: Eastern CT, USA Posts: 1,070 Lean Burn Civic - '97 Civic HX Team Honda 90 day: 51.67 mpg (US) Thanks: 78 Thanked 87 Times in 63 Posts	Further developments. The car now will enter and stay in lean burn well below 65 mph. The morning of June 8 I heard an exhaust leak up front, so I took it to Monro Muffler (franchise). Cat converter/exhaust manifold combination was OK but they replaced everything behind it. I also removed all the remaining lower grill block which was mostly on the cat converter side of the grill as I didn't want them to get in a twist over it. With those changes, it now goes into LB and stays there just as I'd earlier worked out. Warmed up, TPS below 20. Will stay in LB unless TPS goes over 32. I don't know yet if I'll need to replace the lower cat-side grill block when the weather gets cold or rainy. We'll see. For now I'm a very happy camper because it will run in LB at the drop of a hat. Unfortunately I'll never know if the cure was the exhaust fix or the removal of the grill block. Sorry for the red herring info earlier. __________________ Check your tire pressure - keep it up !! We've learned that diet has a closer relationship to cancer than we ever thought. Please see this Wikipedia article on The China Study. Driving Lean Burn '97 Civic HX, lotsa mods by now! '89 Volvo 240 is semi-retired. I did love that car though!