I have a 1991 Camaro Z28 350 TPI w/dual cats.

I take it that both my cats are shot because they are tapping very loudly. I think I might have also put in some bad gas at the locat Cenex.

My question is: Why is my car down on power?

Could the cats alone be the problem, or is it probably the fuel filter, or both???

Thanks,
Solidus

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'91 Camaro Z28 350 TPI dual cats

Everything stock

 

Having a plugged cat (let alone 2), will have a huge effect on performance. You can have all the air you want coming in, but without it flowing smoothly out, it is pointless. If you have had some bad fuel, a new fuel filter would be a good idea too.

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1984 L69 Z28 with 350 H.O., Hypertech ThermoMaster Chip w/ 160* PowerStat, Stock L69 Dual Air Intake w/ K&N, L69 Dual Plane Intake Manifold, Modified Q-Jet, 350 4 bolt main w/ Crane Energizer Cam & 1.5 Roller Rockers, Lunati Drop Forged Crank and Rods, 23 Degree Trick Flow Heads, Hooker Comp Headers, 3:73 Posi, T-5 (Soon to be a T56!), 4-wheel disc brakes, 3" Catback Exhaust...etc.

Wise man say....Man who jump on bedspring this spring....have offspring next spring!

 

Thanks,

But how do I know If my Cats are plugged?
All I know is when I drive it, the cats tap very loudly.

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'91 Camaro Z28 350 TPI dual cats

Everything stock

 

I would either have your cats replaced or cut off...I had my cat clog up on me back when I first bought it, and it effected performance majorly...I thought I had a ***** for a little while. I went to our local Muffler Shop, and had the cat cut off. When I left the place, I thought I had put new heads or gears in. The motor felt new, the power difference I couldn't believe. Just replace them anyways, I'm sure it needs it regardless.

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1989 Chevrolet IROC-Z28 TPI ZZ4 with TH700R4 and 2.77:1 rearend gears:
-Gutted Air Boxes, Throttlebody coolant bypass, Hypertech Air Foil, Accell Superram Base Intake, Crane AFPR, AC delete, Smop pump delete, Hooker 1 5/8 Headers, Holley Ignition Module, Hypertech Custom PROM, B&M Megashifter...I know there is more, I just can't think of it right now!