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Re: Service engin light is on.
You can go to Autozone and have the code pulled and turn the light off, but if there is a problem the light will come right back on. Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you will need to have the car diagnosed and repaired. Let me know what the codes are.
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Po172 refers to an oxygen sensor. But after you service the part you need to clear the code with an OBD II scanner. You can get a reliable inexpensive one at Harbor Freight. After you clear the code then you to start the car and drive it to see if the code comes back on. Also if you have a vacuum leak this can cause the system to run either rich or lean depending on circumstances.
Dirty throttle body sounds like the problem, remove the throttle body and give it a good cleaning, blow it out good with compressed air around the ports and butterfly to remove all the carbon buildup.Hopefully this will fix it or try a strong fuel injector cleaner in your gas first.Hope this helps
the carbon build up is not important here. your intake probably has moisture built up from being stored and exposed to condensation. what i suggest is go to your local auto parts store and buy a bottle of K-100 fuel system cleaner and get a fresh tank of gas in it and put the alotted amount of cleaner and run it for a little while. if that does not work than you may have an ignition problem. the first thing that i would personally try is new plugs and plug wires.
Many possible causes for this. Do you have a "Check Engine" light? Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on.
You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE the problem and perhaps eventually fix the problem.
Soot/Carbon buildup on plugs can be caused by many things, like leaky intake valve seals, excessive crankcase emissions being sent back into the intake air hose, leaky fuel injectors causing an excessively "RICH' fuel mixture, excessive fuel pressure from the fuel pump, faulty fuel pressure regulator, worn/faulty PCV, a faulty O2 sensor (upstream) or even a defective ECU.
Sounds like bad carbon build up, have you tryed using fuel injection cleaner yet? Because of the buildup, I would suggest putting it in with only a half a tank (to get a higher concentration of cleaner vers fuel). Once in, run it down the highway (the cleaner works best when the engine is hot) until you are almost out of gas, then fill it up and add another bottle of injector cleaner (alway add the injector cleaner after filling as the cleaner will foam if added before and this will lead to gas spillage at the pumps). Run the car normally. If it is just carbon, by you next tank of gas the problem should be solved. As pervention, I recomend using fuel injection cleaner every 4 tank fulls (for most people it works out to about once a month).
Try the fuel filter. Sounds like the engine might be running rough due to weak fuel pressure. Its cheaper to replace, especially if it's still original from 04. Try running some injector cleaner through a couple of tanks of high octane gas.