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post #31 of 56 (permalink) Old 03-05-2013, 08:17 AM
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I gutted both pre-cats this past weekend. The car drives 100% better. It doesn't feel like a pig down low any more. I no longer get any random misfires. I did have an issue with one of my COP units which I had to track down last night. The cat must have fried one of the COP units. I swapped it out for another and it's been perfect since.

My only issue now is the CEL for the missing precats. I was hoping the spark plug fouler trick would work but it already popped a check engine light so I'll look into something else. I know some recommended the O2 Simulators. I'd rather build my own since I have electronic experience. I'll search around.

Thanks for all the help and sorry for hi-jacking this thread.
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post #32 of 56 (permalink) Old 03-05-2013, 09:08 AM
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Re: Advice - pre-cat replacement - Catalytic Converter

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Originally Posted by Blackcoog View Post
I gutted both pre-cats this past weekend. The car drives 100% better. It doesn't feel like a pig down low any more. I no longer get any random misfires. I did have an issue with one of my COP units which I had to track down last night. The cat must have fried one of the COP units. I swapped it out for another and it's been perfect since.

My only issue now is the CEL for the missing precats. I was hoping the spark plug fouler trick would work but it already popped a check engine light so I'll look into something else. I know some recommended the O2 Simulators. I'd rather build my own since I have electronic experience. I'll search around.

Thanks for all the help and sorry for hi-jacking this thread.
Glad you got it right... I think someone else tried the spark plug no foul on the O2 trick with the same results. I can't wait to ditch my precats. When you build your own O2 sim, please share!

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post #33 of 56 (permalink) Old 03-05-2013, 09:33 AM
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After looking around at foulers online I think I know the issue. The foulers I bought are too short. I'm going to buy another set for $3 and stack/extend them to see if the signal drops enough to eliminate the light. When I install the O2 into the ones I have the sensor end is almost flush with the end of the fouler and the common foulers everyone has good luck with appear to be at least twice as long. Hopefully there is enough room (I think there is). I'll try it tonight and report back.

It will look like this when finished with two foulers stacked on each post cat O2 sensor:



Vs. this picture showing only one which does not work



Search O2 foulers and look through Google images you'll see what I mean. Most double stack them. You can buy foulers that are longer so you don't have to stack them. I'd bet that's why some have had luck and some haven't. Those that have the CEL still probably used foulers that are too short. The fouler pulls the sensor out of the stream reducing flow making the ECU think the precats are still in place. There has to be a decent drop in flow but the sensor still has to function.

Keep in mind you do need to drill the foulers out so the sensor fits inside of it. The foulers aren't made for O2 sensors it just happens to work.

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Last edited by Blackcoog; 03-05-2013 at 09:39 AM.
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post #34 of 56 (permalink) Old 03-05-2013, 10:32 AM
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My cats also disintegrated about a year ago. Link above, are actually made by someone else (the best ones recommended on this forum but cant remeber who) and re-badged for a cheaper price. With no cat I did get a CEL of cat below threshold temp about once a month so I added their metal performance cat. Total price for headers, and cats was about $750 shipped. Adds some more horsepower and sounds really nice without being loud. Take your old cats to some one that buys them for recycling. I got $350 back for mine.
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post #35 of 56 (permalink) Old 03-05-2013, 10:33 AM
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Forgot to mention that with the performance metal cat I havent had a CEL in a year.
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post #36 of 56 (permalink) Old 03-05-2013, 12:28 PM
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Precats usually get about $10-15 each at the recycling centers around here. Main cats will get you a bit more.
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post #37 of 56 (permalink) Old 03-06-2013, 08:27 AM
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No check engine lights now for about 50 miles. Stacking those foulers did the trick.

I did have another issue pop up. The gas gauge apparently doesn't go below 1/4 of a tank so I ran out of gas and had to push the car off the road. I pulled the pump last night and cleaned the sender contacts with ISO. The gauge immediately started working and dropped to E.

No problems left. Woohoo!

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post #38 of 56 (permalink) Old 03-06-2013, 09:59 AM
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Re: Advice - pre-cat replacement - Catalytic Converter

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Originally Posted by Blackcoog View Post
No check engine lights now for about 50 miles. Stacking those foulers did the trick.

I did have another issue pop up. The gas gauge apparently doesn't go below 1/4 of a tank so I ran out of gas and had to push the car off the road. I pulled the pump last night and cleaned the sender contacts with ISO. The gauge immediately started working and dropped to E.

No problems left. Woohoo!
Nice!!! Did you use your scanner to make sure everything is "complete"?

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post #39 of 56 (permalink) Old 03-06-2013, 11:16 AM
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Quote:
Originally Posted by Blackcoog View Post
After looking around at foulers online I think I know the issue. The foulers I bought are too short. I'm going to buy another set for $3 and stack/extend them to see if the signal drops enough to eliminate the light. When I install the O2 into the ones I have the sensor end is almost flush with the end of the fouler and the common foulers everyone has good luck with appear to be at least twice as long. Hopefully there is enough room (I think there is). I'll try it tonight and report back.

It will look like this when finished with two foulers stacked on each post cat O2 sensor:



Keep in mind you do need to drill the foulers out so the sensor fits inside of it. The foulers aren't made for O2 sensors it just happens to work.
Are you just trying to lean things out?
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post #40 of 56 (permalink) Old 03-06-2013, 11:17 AM
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Quote:
Originally Posted by BigQwerty View Post
Forgot to mention that with the performance metal cat I havent had a CEL in a year.
You replaced both main cats?
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