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A solid check engine light means the ECM, or computer, has detected a fault with a sensor, solenoid, etc. A blinking check engine light means the fault has either temporarily gone away, or been repaired. Stop by Autozone or Advanced Auto Parts and have them scan your OBDII computer in your car. From there, we can further diagnose the fault causing the Check Engine Light.
The check engine light comes on when there is a problem with your engine and throws a code which it then stores. That code can be "read" by an OBDI/OBDII scanner and should give you the info you need. If it was scanned and the codes "read" the check engine light should of been re-set. If your car is running well have your mechanic re-set it; if it comes on again take it and have it checked again. No system is fool proof and there may still be a problem. Hope this helps.
I need to know if you have any type of air suspension. If you have a air compressed shock system then I would say the whoo whoo sound is coming from a leak or problem in the air pressure regulation system. That could cause the sides to move up and down and loose your grip also. Have your suspension checked and have your breaks checked also.
1/3. Obviously the fuel map embedded in the ecu is set up for much better gas mileage than 5 mpg. It sounds as though your sesors could be one of the culprits. AFM (air fuel meter) could be reading wrong and telling your ecu that there is much more air than there really is coming in. MAP (manifold air pressure) same as the afm, depends on which your car has. TPS (throttle position sensor) could be telling your ecu that your engine is asking for more fuel than it needs. There are many sensors in your vehicle that tell the ecu how much fuel is needed and how much air is coming in. It just depends on which ones you have. This is also why your check engine light is coming on. To find out you will need to have your vehicle codes scanned. Once that is done you will know in most cases exactly what needs to be done.
2. Ticking noise-- again there is not one definite solution. There are a lot of could-bes. The easiest way to pinpoint exactly what and where the tick is coming from is to take a long metal rod like a long screwdriver or a 3/8" extension and touch it to various points on the engine, such as on the valve cover above the first cylinder, above the second, and so on. The rod will magnify the vibrations from the tick.
4. Technically you can put a supercharger/ turbo on anything that relies on more air= more power. It depends on your wallet. My suggestion is to locate a shop that works on factory turbo cars. They at least have some knowledge on the subject.
ususlly its something small it also could be that the car has been sitting a while in the car yard you could try disconnecting the battary for 30mns and then reconnecting this some times unscrsmbles the ecu causing the problem good luck