How do i clean the maf sensor and throttle body
Autozone, carquest ect. sell MAF sensor cleaner. Do not touch the sensor because it will most likely break. Pull the throttle body off and spray it down with the MAF cleaner. Brake cleaner is supposed to work but cannot verify that in all vehicles and sometimes carb clean will work depending on the vehicle.
SOURCE: 96 jimmy shuts off while running and will turn
1997 gmc jimmy normally starts and runs fine. Occasionally it wont start though. If I wait about 1/2 hour it will start. It spins nicely, but wont 'catch'. yesterday it would not start, and I have been unable to get it to start. the heat of the day or coldness of the night seem to have no effect. I am thinking that the fuel pump may be bad (150,000 miles), but not sure. Any ideas?
SOURCE: 2003 GMC Sierra Has recently developed
You never replace anything, on a Wishing,Hoping,Pushing,Poking,diagnostic approach
You learn the vehicles Systems,Test,then Replace,if you have a failed component.
Work on the Misfire Issues.
Then you lean O2 Codes will go away.
Not a the plugs.
Think lean---Vacuum leaks,EGR Valve leak,EVAP System leaks,anything with a hose that lets air into the intake system.
Exhaust System leaks,near sensors
SOURCE: i have a 88 gmc
the idle air control actuator is a common problem in this type of fuel injection an is mounted in the throttle body also the map sensor should be on top of intake make sure is connected right and have full vacum if so just tap on it with engine running and will miss if it is faulty please let me know if this helped or need further assistance i'll be glad to help.
SOURCE: 97 sierra fast rough idle, no power, severe knocking
Ok it seems to me like you may have to do some electrical checks, perhaps some voltage checks/drops in order to find out. For the P0118 you could use your scanner provided it can read live data. Look at the coolant temp snsr (cts or ect) and read its value it should read close to intake air temp snsr (IAT) value. The unplug the sensor value should change drastically and go negative. The jump the Two terminals and temperature should go high. If it does you've you've eliminated the circuit and the sensor it faulty. Make sure you have 5v reference as I said before you may have to voltage drop the circuit to make sure you're not loosing any voltage and that the circuit is intact. Good luck! Here are some links with more info and possible causes. http://www.obd-codes.com/p0118 http://www.obd-codes.com/p0507
Glad you got it fixed. Chasing a problem can be very frustrating.
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