I recently bought a High Flow converter for my car (Street Legal). I am trying to find out if anyone knows if the CEL Will come on if the converter is installed? I have heard stories that it does make the CEL come on then I heard that the info was false. Who can I believe? Any one will any info can E-Mail it to me at dawrenn@hotmail.com or just reply to this thread.

 

i would think if it was street legal, you wouldn't have to worry about it, as long as you hook it all up correctly.

 

Depending on how your O2 sensor reacts to it I would think would be what will make your CEL come on or not. My friends 99 Si for some reason will only get a CEL after his car is warmed up. He has just a test pipe so it is not legal. But the CEL does not show untill it gets hot enough in the pipe I'm pretty sure.

 

Test Pipes are known for making the CEL come on.

 

Test pipes don't clean the air, and therefore make your check engine light come on. The reason it's not coming on until the engine is warm is because a cat converter needs to warm up before it is effective.


The high flow cat will not make your CEL come on, as long as it is a quality brand. If you bought a POS cat, you're on your own.

 

I got my High Flow Converter installed and it did not make the CEL go on. When you are at about 2500 RPM it kind of makes a farting sound but not all of the time. My dad thinks it could be a sound of the engine that the OEM converter muffled out. Incase it matters I have a DC Sport 4-2-1 2 piece header and a Greddy Evo catback exhaust.

 

You have nothing to worry about on OBD-I cars that only have 1 o2 sensor in front of the catalytic converter.

OBD-II cars usually have 2 o2 sensors. If you have a 2-sensor o2 setup, then it (could) make it come on if your setup doesn't heat up the catalysts enough for them to "light-off". The front one is what your ECU uses to regulate the fuel trim. The one behind the cat is there ONLY to determine if your cat is working. So if you throw a code for that thing, the CEL means nothing about your engine's performance.

In fact, the rear one isn't even very sensitive. A friend of mine gutted his cat on a OBD-II turbo eclipse, and never threw a code for it. There is a hack to disable that thing using a 1 microfarad capacitor. :thumbup:

http://www.thefbody.com/~95tsiawd/O2bypass.html

 

I got my High Flow Converter installed. When you are at about 2500 RPM it kind of makes a farting sound but not all of the time. My dad thinks it could be a sound of the engine that the OEM converter muffled out. Incase it matters I have a DC Sport 4-2-1 2 piece header and a Greddy Evo catback exhaust. I was wondering if anybody knows why it is making that sound.

 

heat shield maybe? It also could be a clearance issue on the pipes... maybe the dimensions of the new cat make the exhaust line up differently, and it's rubbing on the body somewhere. It's a common thing for exhaust setups to cause a buzzing sound from this. Also remember that the engine moves around when it's under load, and that if the exhaust has clearance when it's on jackstands, it might not when you're putting power down.

 

What do you mean heat shield? my exhaust system or my converter does not have a heat shield. Here is a picture of it the converter