Troubleshooting engine codes?
01-28-2006, 10:16 AM
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Troubleshooting engine codes?
Hey ya'll I'm new here. My 99 2wd 4Runner with the v-6 is showing P0303 code (cylinder 3 misfire) and P0171 (System lean bank 1). I have put new borg-warner wires and NGK dual electrode plugs in it and still get the message. Sometimes under hard acceleration the "check engine" light blinks on and off (which I was told was misfire). Doesn't sound like it's missing and haven't noticed any obvious drivability issues. My next thought is to swap the coil pack off number 3 and see if the miss moves with it. Any other ideas?
01-28-2006, 03:21 PM
#2
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Originally Posted by krue
Hey ya'll I'm new here. My 99 2wd 4Runner with the v-6 is showing P0303 code (cylinder 3 misfire) and P0171 (System lean bank 1). I have put new borg-warner wires and NGK dual electrode plugs in it and still get the message. Sometimes under hard acceleration the "check engine" light blinks on and off (which I was told was misfire). Doesn't sound like it's missing and haven't noticed any obvious drivability issues. My next thought is to swap the coil pack off number 3 and see if the miss moves with it. Any other ideas?
P0171 - is often the MAF sensor needing cleaning but can be due to other factors too
01-28-2006, 07:45 PM
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You're two for two! 
I swapped the coil pack to #1 and read the code, the code moved to #1, I moved it to #5 and it followed so I replaced the coil pack. After searching here, I cleaned the MAF sensor and cleared the other code.
Now to solve the other issues with this truck.
I swapped the coil pack to #1 and read the code, the code moved to #1, I moved it to #5 and it followed so I replaced the coil pack. After searching here, I cleaned the MAF sensor and cleared the other code.Now to solve the other issues with this truck.
01-29-2006, 02:42 PM
#4
Contributing Member
Originally Posted by krue
You're two for two! I swapped the coil pack to #1 and read the code, the code moved to #1, I moved it to #5 and it followed so I replaced the coil pack. After searching here, I cleaned the MAF sensor and cleared the other code.
Now to solve the other issues with this truck.
I swapped the coil pack to #1 and read the code, the code moved to #1, I moved it to #5 and it followed so I replaced the coil pack. After searching here, I cleaned the MAF sensor and cleared the other code.Now to solve the other issues with this truck.
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