just a thought, but for those experience clearance issues when trying to use two foulers, or just still throwing a CEL, what about drilling a small hole through the side of the plug to let fresh air in and thus increase the air in the A/F ratio for the O2 sensor.
just an idea, my other idea is to place a diode in between the two sensors which would drop the voltage at a constant rate and only flow one way, to make the ECU think the cat is working. (Lower voltage at the O2 meaning cleaner air)
^^ Lower voltage at the O2 does not mean cleaner air. The voltage of BOTH O2 sensors varies from ~0V to ~1V depending on the exhaust they see -- the primary O2 changes with a higher frequency and the secondary with a much lower frequency.
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Mr. Flibble is very cross!
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If anyone wants a testpipe for an SH that has clearance I'm selling one. When I got it the O2 sensor mounted straight up, so I cut the pipe, bought a metal sleeve, rotated the pipe inside the sleeve to get the bung where I wanted it and then rewelded the sleeve to the pipe. I believe it's 2.25" ID.
Bump for a really old thread, but does anyone know what would make this NOT work? I did one anti fouler with my high flow cat, bored it to 7/16" enough to just fit, and took a drive and it came back. Any ideas? I may try boring to 1/2" and maybe use 2 anti foulers...
Yeah thanks... I tried boring to 1/2" and it took much longer for the CEL to come back, could only mean that having it at 7/16" was giving it no reading at all. I'm gonna try putting on the second anti fouler on wed morning
FWIW I have an O2 that won't give a CEL at all- not sure what's wrong with it, other than having 230k miles on it. With a test pipe, on my 97 (98 might have a less-picky ECU as the Fed emissions were different than 98+) this thing won't throw a code at all. Sort of nice.
If there is no flow around the O2, it will throw a code (eventually). It has to be exposed to some exhaust. The trick is to expose it to enough that it sees a shift but expose it little enough that it thinks the cat is there.
Yeah I was getting the "Catalyst System Efficiency Below Threshold (bank 1)" I'm thinking this means too much flow right? It thinks the cat is busted? If I have to put two anti foulers to kill it then I'm just getting a test pipe haha
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Nacho, nacho maaaan......I want to be...a nacho man.
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