i was wondering if mustang Mil Eliminater will work on a 1999 f150

 

Should but it's not worth it to remove the converters to start with.

 

Whats your reasoning for this?

If a guy likes loud exhaust, the only true way to get that is to remove those restrictive cats, or get some high flow ones.

When I removed the cats on my old 97 f150, I never had any codes show up, and the truck sounded alot more like how I wanted it.

 

It's my understanding that theses vehicles require a certain amount of back pressure to run at peak efficiency, I have a cat back pipe set up and it sounds just fine. Not to mention no CEL and it will pass inspection plus it'll be a lot easier to sell when the time comes.

 

Ah the good ol back pressure debate haha. I wont get into that now, as it does make a difference on some engines, although the 4.6 liter isnt really one of them.

A high flow cat would not have produce as much back pressure as a stock one, for a reason. They are high flow. You dont get much higher flow then no cat at all!

Like I posted before, my old 97 had no cats, sounded alot different then a truck with a cat back exhaust, and didnt throw any CEL. We dont have inspections up here, so that wasnt an issue either.

 

Surprise!
The PCM looks at the OX sensors full time to feed back info to the PCM for adjusting fuel injection amount.
The Rear sensors are also looked at and detected if missing.
These sensors missing are detected by open heating circuits as well.
YOU CANNOT run without them and 'not' generate a code or CEL lamp.
If you heve no CEL, the dash lamp is OUT long ago!.
Check with a scanner and you will see two or more codes as a result.
You cannot get away with it not being reported by the PCM and an off normal PID monitor.
The whole system was never designed to let you just disconnect anything and not be detected..
Thank the US EPA for this.
Of course, if there is no inspection, no body cares.

 

On my system, the dash cel wasnt out, it worked like it should.

I cant remember now what else was done when the exhaust guy did my truck, but I know i had no cats, and no cel, and was a much happier man with how my truck sounded!

I know the guy that bought my truck from me when I sold it, and he has it set up the same way as when I ran it, and still no CEL, and still no cats installed either. (exhaust guy musta put all the O2 sensors back in the system)

 

But to say that you have to assume several things. One you have to assume that the stock cats are restrictive, which they are not, they use the same 400 cpi ceramic catalysts that most everything on the market uses.

Yes it will make it louder. You can remove just the rear ones without getting a light, but that depends on where your O2 sensors are located.

And O2 simulators are illegal, which is why no one in the US makes them anymore. Any you can buy are either imported (they have to get them past customs somehow) or are residual inventory. Furthermore, they do not even work. Very often a simulator will be detected as a bad O2 sensor, or will trigger a converter code anyway.

 

The stock cats are more restrictive then no cats, and for the high flow cats you may be right, I was just basing that off of what I have read about them.

Regarding the simulators, I would try it without them first. Might get lucky like I did and get no light at all.

Many things that are illegal are silly(wonder how many guys out there speed!), but I wouldnt be afraid (up here anyways) to try them out and put them on.

 

To help you understand, the OX sensors voltage outputs swings/switch over a short range according to oxygen levels detected at about 0 to 1 volt +/- while the motor is running.
If the PCM does not detect this, a code is set and CEL lamp lights and fuel control goes to fixed tables making the motor run a bit rich for saftey.
As well, the heating element circuit for the OX sensors are monitored and will set a code and lamp if this function is faulty, or missing.
This is built in every PCM program and is how fuel injection is controlled on every motor.
How no code and lamp comes about with missing operational sensors, with this type of control is a mistery for sure, or it is being ignored.
Also, again, the second set of OX sensors are there to sense the "ratio" of front switching to rear switching as a clever way to tell if the cats are working properly and report by code and lamp, should that fault occurr with faulty/missing cat operation.
There is no normal way to NOT see the effects of missing or modification to the system that result in detecting these actions.
Lastly, look at all the codes that are associated with the cat and sensor operations that support the above discriptions.
These codes are not ignored, hidden or canelled by any means in the PCM program except passing all PCM testing
If you look at the PCM with a good scanner, you will see it as a PID MONITOR that has not completed due to any type of fault or change.
The final end result is a code P1000 set indicating any PID monitor has not been satisfied by PCM testing.
No one can even cancel or reset a P1000 CODE. It is an internal function of the program so even a PCM 'power down' or any other code 'clearing' on even a fault free system will set this code such that the testing begins all over again.
You see by the above why I would be reluctant to accept hearing that no codes or CEL are present with missing equipment conditons present, due to the complex system control and detection.

 

Interesting little write up.

Ive read that if the sensors are installed in the right place in the pipe, with the cats removed, that they will not trigger the cel, and thats what I believe happened with my own truck.

You can accept or think Im full of BS, as it makes no difference to me. I drove the truck for a few years and alot of miles like that, and still see it around, and its still like that, and operates the same.

I have absolutely no reason to BS anyone about this, only stating my own personal experience.