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89-5.7GTA 07-14-2017 11:05 AM

Opinions/Advice re: catalytic converters
 
My car is a 1989 5.7 with dual cats. Car has 71,000 miles. Original cats replaced about 2 years ago - had loud rattling sound and one had physical damage from a speed bump. Local muffler shop replaced them with no name economy cats. Now these things are rattling like marbles in a coffee can (the old metal kind). The shop replaced the one we thought was making the noise at no charge. Still rattling so the other one must be bad also. I've put on less than 1000 miles on the first replacement cats. The car runs very well with no issues and no SES light. I don't know what is causing the cats to fail so soon, other than their poor quality.

The car is over 25 years old and is exempt from emissions inspection. I am considering removing the cats and replacing with straight pipes. (For off-road use only!). I don't intend to sell the car, but if I did I would disclose the lack of cats to a buyer. Has anyone removed the cat(s) from these cars? Are there any engine/drivability issues that result from this? Will it set off an SES light? (No O2 sensor post cat, so I doubt it, but…).

If anyone has any experience with deleting the cat(s) on these cars I'd appreciate your input.

DynoDave 07-14-2017 07:38 PM

Re: Opinions/Advice re: catalytic converters
 
Quote:

Originally Posted by 89-5.7GTA (Post 441618)
Are there any engine/drivability issues that result from this? Will it set off an SES light? (No O2 sensor post cat, so I doubt it, butů).

You are correct about that part. Post cat O2s are an OBD2 thing, and our cars are all OBD1. So no issues there.

Haven't done it myself yet, but have talked to several locals who have...no issues. My local shop wants to take mine out. I'll keep it in case I ever need to / want to go back to stock.

MunsonGTA 07-26-2017 11:50 AM

Re: Opinions/Advice re: catalytic converters
 
I did this to my car years ago. Even when I had to go through echeck, it wasn't an issue. I actually took the cat converter and punched it out hollow with a piece of pipe, then reinstalled it. Eventually I just replaced it with a piece of straight pipe.

BlackGTA 09-09-2017 09:54 PM

Re: Opinions/Advice re: catalytic converters
 
I had an 88 GTA Notchback that I bought with the cat gutted and reinstalled years back, drove the car everyday and when I sold it I had about 210,000 miles on it and never had any problems with it and no SES light.

89-5.7GTA 09-11-2017 03:16 PM

Re: Opinions/Advice re: catalytic converters
 
Still dragging my feet on this one. I have a local guy who can do the work for me, but he has been busy. In the meanwhile, my power antenna broke so I am trying to figure that out. Unplugged from the relay for now, but a repair is being added to the list...

CanuckDreamz 06-08-2018 07:36 PM

Re: Opinions/Advice re: catalytic converters
 
My life has been improved by doing what you are considering.

89-5.7GTA 06-10-2018 06:06 PM

Re: Opinions/Advice re: catalytic converters
 
I have to thank you, Canuck, for reminding me that I have to get going on this project - I keep getting distracted by other stuff. I think I am going to pull down the pipes from the manifolds and work on it off of the car. Soon. Probably.

CanuckDreamz 06-11-2018 12:49 AM

Re: Opinions/Advice re: catalytic converters
 
Or just get under the sucker, drop the hangers aft of the cat until you've cut, then re-attach and fit your patch pipe. Nice little 4 beer project and get back to your distractions. :)

Depends how anal you want to be, but you could always come back to it when you want to get fancy, with fewer diftractionf


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