Bought bmw would not run for more then 15 seconds ,

I recently had my engine replaced in my 2002 grand marquis 4.6 with a 2009 crown Vic 5.4 engine and was running fine until I broke my ignition and tried to replace it myself I bought a new ignition switch didn't work so I bought a steering column and still won't start what do I do

BMW 135i Overheating Repair Symptoms Radiator Fan Assembly Replacement
When the radiator fans stop functioning properly, the engine temperature will rise as there will be insufficient airflow to cool the radiator. The spike in temperature will be t... Read More
Radiator Replacement
A failing radiator can cause the engine to run hot or overheat. Most radiators are made of metal and plastic. The plastic parts can become brittle and crack over time, causing a... Read More
Thermostat Replacement
A thermostat that is stuck open can cause the engine to run colder than normal and set the Check Engine Light. It may also cause poor fuel mileage and the heater to blow cool ai... Read More
Water Pump Replacement
Water pumps require replacement if they begin to leak coolant or become noisy. Leaking water pumps can result in damage to the drive and timing belts, as well as cause the engin... Read More
Radiator Fan Motor Replacement
If the fan motor does not work, there will not be enough air movement through the radiator to dissipate the heat in the coolant. The symptom usually associated with a faulty fan... Read More
Radiator Hose Replacement
A coolant leak may be noted from the hoses. Coolant hoses can be damaged by oil leaks, or age. This will lead to swelling or cracking, it is suggested to replace the hoses befor... Read More
Coolant Leak Diagnosis
When the cooling system is not working to its full potential, normally due to a leak, the engine will being to run increasingly warmer with time and vehicle use. This is because... Read More
Install The Latest Software And Driver Updates From HP Support Assistant

My guess... and it's only an educated guess as there are so many possibilities, the fuel filter is blocked.
When you ask about remapping I'm assuming it is a computer controlled engine management system. Does the check engine light come on wither the ignition on but go out when you start the engine?

Definite answer is DONT DO IT. Motorcycles are balanced one part against another, to provide the best performance possible for the majority of riders, short of re-engineering. If you start fooling with these things willy nilly, in addition to polluting the air and annoying the neighbors, you could ruine your investment and hurt yourself. Is 100 + miles per hour in fewer than 15 seconds not sufficient for you?

You smell burning oil. See if there is oil in your spark plug wells or down the exhaust side of the engine. If there is, replace the valve cover gasket. That may be related to the miss if there is a lot of oil on the plugs.
You say the (Check) Engine light is on. Your engine light will flash a code to indicate the problem if you turn the key to the On (just before it starts) and press the gas pedal all the way to the floor five times within five seconds.
http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm

if you have had a fault with the oxygen sensors for a long time it is possible it has fouled up the catalytic converter.

if the engine check light is the one for routine service and oil change and there is no other fault, it may be possible to reset it yourself.

1. turn ignition key to ACC or LOCK position

2. ensure the odometer is shown and not the trip meters

3. press and hold the trip meter reset button

4. while holding the reset button, turn the key to ON position

5. keep holding the reset button for at least 5 seconds. the odometer will read "000000"
and the light should go off.

if it does not go off then the system will need to be remapped, possible after a new catalytic converter.

try the reset sequence first though

no with air induction you should be fine. The computer will adjust fuel air mixture. When you add a different exhaust system is when people run into trouble. That changes back pressure and can cause the engine to run outside of computers control..

One of two things I think, if you are using low octane "Regular" gas in this can and it says it requires premium, the car could be retarding the timing which could cause a knock on idle.
you could also check the compression for a loose valve that could be causing the knock, otherwise you might have a bent rod, which it sounds like you might. The kock will get progressively worse until you fry your engine and have to buy a new one. Good Luck. Talk to a mechanic.

Depending on your mileage, you may need to refurbish your turbo as its on its way out if your getting very low power or you can remap. I have got mine remapped to 120 bhp and mpg/torque is awsome.