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shadrach74 · 10-18-2012, 06:21 AM

So as some of you know, 2002 S (52K miles) has been down for a while getting a clutch, IMSB retro, tranny, bypass pipes etc..

The genesis of this project was a reoccurring CEL on bank one for the catalyst. When we pulled the headers, the Cat was rotted and there was debris scattered down stream through out the exhaust system.

So my question has to do with the ECU and how it performs in my scenario.

With a bad catalyst and the associated CEL How does the ECU alter it's management of the engine? The car ran fairly well, but was a bit of a gas hog (avg just under 16mpg with my heavy foot). While the car felt reasonably strong, acceleration was not in keeping with it's power to weight ratio.

I compare it to my 98 GS400 with 210K miles on the clock. The GS has a slight power/weight disadvantage, but it still pulls much stronger and turns better mileage.

Can I expect the car to run better when I get it back with the primary cats performing properly?

10-18-2012, 06:21 AM	#1
shadrach74 Registered User Join Date: Jun 2012 Location: Frederick MD Posts: 658	Rotten Cat on a 2002 S So as some of you know, 2002 S (52K miles) has been down for a while getting a clutch, IMSB retro, tranny, bypass pipes etc.. The genesis of this project was a reoccurring CEL on bank one for the catalyst. When we pulled the headers, the Cat was rotted and there was debris scattered down stream through out the exhaust system. So my question has to do with the ECU and how it performs in my scenario. With a bad catalyst and the associated CEL How does the ECU alter it's management of the engine? The car ran fairly well, but was a bit of a gas hog (avg just under 16mpg with my heavy foot). While the car felt reasonably strong, acceleration was not in keeping with it's power to weight ratio. I compare it to my 98 GS400 with 210K miles on the clock. The GS has a slight power/weight disadvantage, but it still pulls much stronger and turns better mileage. Can I expect the car to run better when I get it back with the primary cats performing properly? Last edited by shadrach74; 10-18-2012 at 11:51 AM.