ok..a few weeks ago my car started to run real bad...and then it completely dies...would turn over ,but no start. took it to a mechanic friend of mine , and he found out the fuel pump went bad. but it didn't just stop working. apparently...it was slowly losing fuel pressure. (explains why the car was running bad) and made the car go real lean..which in turn melted the front pre cat and the main cat as well. i wasn't about to install new pre cats (their huge $$)so i had him gut the pre cat and main cat. this should be done tomorrow and i hope the car is back to normal....but what issues am i going to run into with the pre cat nd main cat gone...besides emmisions...AND ..if i just put a main cat back in it...will it pass emmisions..?

 

Pass emissions? yes

 

then what is the pre cat function? should i have him gut the rear one as well?

 

Pre cats helps with emissions when the car starts up, when your car is warmed up you only need the main cat to pass emissions.

If you don't give 2 ***** about emission, gut them both.

 

I say gut the precats, do the nonfouler trick, and replace the main cat with a testpipe. Depending on inspections are, put the main cat back on for it.

Ebay a 240sx test pipe.

 

whats the " nonfouler trick" ??

 

A spark plug antifouler will basically screw in to the port for the O2 sensor and then you screw the O2 sensor back into the antifouler with the effect being that you draw the sensor out of the exhaust stream and thus cause that difference in readings from main to rear sensors that would normally be there with a cat.

 

Does your state do the ODB2 scanner test or the meter in the tailpipe test? If ODB2, you will need o2 simulators or non-foulers to trick the system into thinking you have working precats.

 

how much did they charge you to gut the pre cats?

 

i haven't gotten the bill yet...car should be done today. but i am gonna bet its gonna be some $$. he had to cutt off & fix almost 90% of the bolts that hold all the pre-cats to the Y-pipe.

this wasn't a planned project..
and Ct does have emissions...but i'm not sure if we have that ODB2 scanner test , just a meter in the tailpipe, i think

 

Will antifoulers be needed in every O2 sensor hole? Because I have a Cali spec Maxima, and I was planning on doing the Warpspeed Y Pipe install, also we have the OBDII scanner test in NH, would I pass with antifoulers?

Sorry for the thread jack.

 

They are only needed in the o2 bungs that are after the location of where the pre-cats should be. Without them, or o2 simulators, you will most likely get a Service Engine Light and a code which will make you fail inspection.

 

You too will need non-foulers or o2 simulators.

Conn testing: