I own a 1999 360 Modena. I have been told it has "Pre-Cats"... Can some one explain what that means? also..... I want to know what would happen if one were to remove the cats altogether.? Would my car run cooler? Run faster? Sound better? OR Would this damage anything or set off a bunch of sensors???? I am not concerned with smogging the car for registration purposes.. it would never be used on the highway.... Please help me with any information someone may have... Thank You...
I'm guessing there's already a bunch of other threads mentioning pre-cats (or de-cats) - have you tried any of them ? .
I think 1999 models don't have pre cats. But they do have catalysts like all modern vehicles. Removing them is a different matter
If the car is manufactured to be sold in the USA then it shouldn't have any problem passing CA smog. Assuming that it passes all OBD2 monitoring test and no emission modifications was made on the car.
To answer your question: "pre-cats" are an integral part of the headers, while the main cats are in the typical position after the headers. If you remove the main cats without doing anything else you should be getting a check engine light associated with OBDII error code(s). For off-road purposes, if you remove the cats and "tune" the ECU mapping, you should be able to gain some power I suppose, from the resulting more free flowing exhaust system - not sure how much, though. You would also get a smelly exhaust... Jes
No pre-cats on the 1999 360's, just plain cats. 2000's and later have pre-cats. That is why the 99's have a little bit more HP and are really hard to get passed CA Smog...
the 99's have a big issue getting the ODBII monitors to come on, they pass the sniff test easily but they fail on the monitor readiness test. My car has LOTS of fails in its history, hopefully the Ferrari ECU reflash last year fixed my monitors for good.
My 99 360 never had any problem passing the actual emission test. However the new CA smog law now allows only 1 OBD2 monitor not ready. No pre-cats, you already have 2 monitors not set.
With such high taxes and now more stringent emissions cutting old cars off the road.. you guys sure are dedicated to nice weather..
Interesting. My understanding is that for MY 1999, you are allowed up to 2 NOT READY. But If you fail with not enough monitors ready, then you will need the CAT monitor ready on your next visit. Mine is an 03, but I'll ask the inspector the next time I need to smog.
I was under the impression that it was 2 monitors off, if they changed the rules and made it 1, my car will never again pass.
Not necessarily. My 99 generally gets all seven monitors solid, although EVA does come and go depending on the fuel level. Which two monitors are giving you issues? Have you had the ecus reflashed by FNA?
I don't know about nt6d's issue but I had 3 monitors off, evap and I can't remember the other 2 but i am sure I could find it here somewhere, I posted long sob stories about it at the time. Dealer had to reflash the NCM ECU's whatever that is, the main ECU already had been flashed after that all but evap was on and evap was going on/off. Mike (who will not worry about it next April, darn it)
mild cause of evap going on/off is usually caused by loose or bad fuel cap. More seriously would be the hoses tied to the evap system not holding vacuum and that entails digging around the fuel delivery system on both the fuel tanks. Sniff for gas vapor and that should lead you to a suspecting area.
i had issues with the monitors on my 99, as well. The dealer claimed that the factory reflash would fix the issue permanently. The ECU had to be sent to Maranello or New Jersey. When the next smog comes up....I will take it to the dealer, since they claim to have remedied the issue.
I have a '99 with the same evap readiness issues. What did the dealer charge for the reflash? and which dealer did it for you?
The reflash will help get the O2S and HTR monitors to set. FNA has done it for free, but you'll have to pay your local authorized dealership to coordinate with FNA and remove and then reinstall the ecus. Figure a couple hours. The EVA monitor is just intermittent. I've heard that best results can be had at just over half a tank. If you just have EVA unset you should be fine. 2000 and earlier are generally allowed up to two monitors unset.
Took my 1999 360 in for smog. Passed smog! Oh, I had about 1/3 tank of gas if that makes any difference. Image Unavailable, Please Login
Thanks for the information. my '99 is having problems with the O2s and HTR monitors setting, as well as the EVAP. So this may help with what I need. My car passed smog, but then had another non-related issue come up with the MAF's and I had to reset the codes...leading my EVAP monitor to become un-ready.
