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Old 09-07-2011, 09:16 AM   #1
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Default bad cat, and lack of power

One of the cats are rattling away pretty bad, so if I axe both on that side what will happen with the performance due to the same readings from the o2 sensors?
Other than that its lacking on power. It was running like hell, so I switched out the clutch, slave, starter, one of the coil packs, leads, cleaned the throttle body, new fuel filter, and new plugs but I'll replace them with something better. I found that the nut that bolts the egr onto the exhaust manifold rusted away underneath that piece of cloth so I did a temporary fix. It's a hundred times better now, but still a little low on midrange torque. Maybe its just not burning all the fuel cause the cheapo plugs. 1997 4.6
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Old 09-07-2011, 11:13 AM   #2
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If you're going to remove the cats it has to be done on both banks and not just one side. The imbalance from different velocities causes some bad results. Also if you get rid of both the flow past the front O2 will be altered leading to funny a/f ratios being made on that side, again possibly leading to more problems. Either remove both sides all of them and get tuned for it (not my first choice), get stock replacements (good but more costly), or get aftermarket cats like 94106 Magnaflows and put them in place (most cost effective).
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Old 09-07-2011, 09:38 PM   #3
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remove the cats to see how she runs, if she runs good. replace the cats with new ones
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