Hello, I own a 2009 Interceptor. Recently purchased a K&N Typhoon Series Cold Air Intake for my vehicle. Turns out the part is not compatible with the Interceptor computer. Seems to create problems for the mass airflow sensor. SCT Performance offers a computer programmer for the vehicle, whereby you can load various tunes onto your vehicles computer. I was told one of the tunes should enable the vehicle to accept the new air intake without issues. Also heard the intake might be taking in a little too much under hood air, but I'm pretty sure people in Arizona have K&N intakes and uhh well its hot there. Can anybody shed some light on this issue? Any help would be greatly appreciated. Thanks.
You need a "tune" (reprogram) anytime you change the air or fuel flow characteristics and exceed the parameters entered in the existing ECU program. Look at the good side; at least we no longer have to adjust points.
I'm not trying to discourage your fun, I don't own anything stock, but I concur with r-clar. The limiting horsepower factor with 4.6 breathing is not the intake, it's the 2 valve cylinder heads. Even the PI heads will not make big power numbers.
Additionally, you are not looking for high RPM horsepower, it takes "tons" of torque to move a heavy Crown Vic. The only way I have seen significant "streetable" power increases in a CV is to build a larger engine.
Cold air intakes work on engines that have restrictive intake flow, but the 4.6 is not one of them. There is always a horsepower "bottle neck" somewhere, either the intake, cylinder heads, cam(s), or exhaust. They all have to work together, and that usually requires major mods and expense. Changing one without the others usually results in a loss of power, especially torque.
I appreciate all the info. Was under the assumption that the intake was an easy, non invasive way of increasing performance. Someone mentioned to me that the issue might be with the fuel injectors being too small. More air means more fuel required. Perhaps the current injectors cannot handle the extra load, so the motor is leaning out.
Intake mods are an easy way to increase performance in some engines, if the engine can benefit from additional flow in the intake. The 4.6 cylinder heads, not the intake, however, are the bottle neck in a stock engine.
It is torque, not horsepower, that accelerates a car. Horsepower is only a function of torque. You might see a small HP increase with cold air intake and larger injectors at higher RPMs, but will loose torque on the "bottom end". That's OK for a race car that spends it's life in the upper RPM ranges, but not good, in a street driven car, especially a heavy one with stock gearing. (A broader torque band, more time in the "fat range", will also accelerate a vehicle faster, but is too much to talk about in this blog).
I used a stock 4.6 intake, even the stock injectors, on a 5.4 and it made over 320 ft.lbs. of torque and a little over 300 HP on the dyno (RWHP). I didn't need larger injectors (24-30 lbs per hour) until I used a larger throttle body. This was on an engine with Trick Flow heads and cams.
Bottom line; you might impress some kid (sorry kids, not all are the same, my 13 year old knows better) when you open the hood and show off a cold air intake, but it's a waste of money and a source of problems on a stock engine, as you have discovered.
BTW, K&N makes a GREAT product when used properly. Try one of their air filters in a stock intake. You will save money over the long haul with filter replacement and a clean filter will do good things for mileage.
Thanks for the reply brother, that definitely clarified the issue for me. (Someone who is not really a car person). Fortunately my wallet was the only one to suffer for my in-experience! Anyways, there are always willing takers on KIJIJI. Appreciate the info again, all the best. Good drivin.
I hope we helped. Keep in mind that each car (engine) is different and those experiences only apply to 4.6 two valve engines. Playing around with modifications to your car can be fun, but is usually an expensive hobby that's best left to a car you don't need everyday. A cold air intake PLUS the TUNER from the FRPP catalog made a seat of pants difference on my Shelby, but took a couple of days to sort out. It's a good thing I don't have to rely on it for transportation.
I forgot to ask, but does your car have dual exhaust (HPP equipped)? If it is a single exhaust car, the most bang for your buck would be to start with a more efficient dual exhaust system. You will reap more performance plus gas mileage with a good dual system.
Don't forget that an engine is just an "air pump". The more air you can get into and OUT of an engine, with the proper fuel mixture, the more power it will make. But you must carefully coordinate the mods so they WORK TOGETHER IN YOUR CAR. Think of building a torque "monster" for everyday drivers because you don't drive around at redline on the street.
Hopefully you can recover some of your costs on E-Bay.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.