My 2005 Pontiac Grand Prix check engine light came on at about 93,000 miles. The code said P2440, so my mechanic replaced the air check valve the secondary air check valve. After replacing those parts my check engine light is still on. What could the problem be now?
This Site Might Help You. RE: Ideal tire pressure; 2007 Ford Focus? What is the ideal tire pressure for a 2007 Ford Focus SES hatchback? Currently on 16 wheels, all-season Pirelli Tires Thanks!
Tyre pressures are normally given as a range rather than a single value. The front end is heavier when the car is empty, but passengers and stuff in the boot make the rear end heavier, hence the higher pressure limit on the back. The actual pressure you are supposed to use depends on how much weight you usually carry in the car. If it's just you, and nothing in the boot, use the lower figures. If eg. you are taking some friends to the airport it packed full of people and luggage, use the highest figures. If you normally carry two people or (like me) the boot is aways full of stuff, use somewhere in the middle - ie. my Mondeo has ranges of 30-35 for front, 30-40 for rear. I normally run at 32 34. Running slightly high of the minimum wont do any harm. it just means you are less likely to have the edges of the tyres wear out early as the centre of the tread is not held to the road hard enough. That was happening when I stuck to the minimum figures.
Time for a new car anyway ! I spent 200 ballons on my mercedes to get rid of a check engine light and it came on about 20 hours later and they refuse to fix it try that one !
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Anyone do an A/C check on it? Or is this a code specific to the emssions system? Common problem, eventually, is the throttle position sensor. This sends specific electric voltages to the computer and the computer makes many adjustments and changes to the timing and fuel-air mix as you accelerate or decelerate. This one sensor makes many other sensors and things go haywire so you think you need a half dozen sensors when it all comes down to this one bad sensor. I'd first get a free charging sustem diagonostic from AutoZone or Advance Auto since all of these same sensors are dependent on a good charged battery. When the voltages drop off on a dying battery, things will start to malfunction and the engine will run rough aand various trouble lights will come on. If you are the end of the batteries life expectancy, this would be the first thing to replace. Then I'd suspect the throttle position sensor. Make sure you keep track of which code or codes are popping up. Good Luck!
