Question about 2003 GMC Sierra 1500

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SOILED PLUGS I HAVE A 2003 GMC SIERRA 4X4 5.3 LT IT KEEP'S TURNING THE PLUG'S BLACK ON THE DRIVER'S SIDE Truck runs rough, ck engine light comes on displaying P0171 and P0300. Have replaced all plugs and wires as well as both O2 sensors. Using much more fuel.

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171 is a lean bank one check for vacuum leak at the intake manifold

Posted on Mar 13, 2009

  • mike loshbough
    mike loshbough Mar 14, 2009

    did you figure out the problem because i am curious

  • mike loshbough
    mike loshbough Mar 17, 2009

    take it to a shop its obversely you cant work on cars

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Related Questions:

1 Answer

What is the sparkplug firing order for GMC Sierra pickup truck with a 5.7 liter engine


1-8-4-3-6-5-7-2

Driver side cylinders, starting at the front of the engine, are 1,3,5,7

Passenger side, starting at the front, are ,2,4,6,8

Hope this helps.

Feb 24, 2015 | 2003 GMC Sierra 1500

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1993 gmc sierra 4wd runs rough after engine warms up.At stop lights she will stall out if i dont keep foot on break and give a little gas. any suggestions ?


Question, does this pickup blow black smoke on idle or at a stop sign. If so check your map sensor might be plugged up or unplugged or bad.

Mar 05, 2014 | 1993 GMC Sierra K1500

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My 2003 GMC Sierra idles rough and cut off sometimes when turning.Replaced fuel filter and changed plugs.engine light stays on.Which 02 sensors do i need to replace first? Before converter or after...


Before replacing the O2 sensors, I would check the fuel pressure. You may also try to have someone pull a trouble code from the powertrain control module to verify why the engine light is on. Do not replace any parts until this is done, otherwise your going to be guessing at the root cause, and it will get expensive with part replacement.

May 11, 2010 | 2003 GMC Yukon XL

3 Answers

My truck seems to be running to rich on fuel when starting after it is warmed up, cold starts are fine. 1999 gmc


There is a possibility that your temperature sending unit for the computer is not working correctly. ( not the sending unit for the gage, there are two). If the computer never knows that the engine warms up, it will keep "choking" and over fueling. Thus, the black spark plugs.

Jan 02, 2010 | 1999 GMC Sierra

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Rough accleration through 2nd gear


Had a loose Distributor cap and spark plug. Changed out the plug wires anyway and truck runs great.

Jun 24, 2009 | 1989 GMC Sierra

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03 GMC sierra 1500 sle wont start..


if your check engine light is on,yes.it worked for me.

Mar 27, 2009 | 2003 GMC Sierra 1500

1 Answer

2003 yukon xl 5.3l flexfuel all plugs lean on passenger side


P0131 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage

P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1


Bank 1 Sensor 1
P0300 - Engine Misfire Detected

I would check for vacuum leaks, maybe intake or brake booster

Dec 16, 2008 | 2003 GMC Yukon XL

1 Answer

I have a 1998 GMC 1500. For several years now I have experienced the same problem over and over. The check engine light comes on and eventually the truck starts running very rough. I have taken the...


resistance in plug wires ... degrades them. I find this as a standard GMC Sierra problem. Two sets on mine already. Coding is for misfires. Also, possible to unplug your MAS [mass air sensor] which will keep the 'check engine' light on at all times but it will no longer be in the circuit and could also be another solution to the problem. Changing out O2 sensors is just expensive since there are Banks A and B and each bank has 2 sensors. The cost from a part store is 80$+... hate to know what they charge you at a garage.

Go with the new wire set first.

Sep 22, 2008 | 2003 GMC Sierra 1500

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