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  #1  
Old 11-14-2011, 02:08 PM
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Default #4 Cylinder Misfire

I have a misfire on the #4 cylinder, I have changed the Spark Plugs, The Plug Wires, The Rotor & Distributor Cap. But I still seem to have the miss. If it is the #4 injector, how do I replace it. I swapped plug wires, & changed the Spark plug, what else could it be ? I forgot to mention it is a 1999 Suburban 4x4

thanks in Advance
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Last edited by dogman1313; 11-14-2011 at 02:12 PM.
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  #2  
Old 11-14-2011, 02:41 PM
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Is it have a check engine light? If so, can you read the code?
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Old 11-14-2011, 02:49 PM
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Yes it has a code & you can feel the misfire , the code is po304 which I believe is a #4 cylinder misfire.
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Old 11-14-2011, 02:56 PM
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PO0300 is misfire, so 304 indicates to me #4. What did the plug(s) look like?
NGK Spark Plugs USA
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  #5  
Old 11-14-2011, 03:13 PM
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The # 4 was kinda white, w/ a little black, it wasn't wet, I just took an old wire & replace the new one, I changed the new plug out with another new one but still have the misfire. I have an AutoEnginiuty program that I use, plus a generic scanner & they say the same, but what could be causining the misfire on #4?
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Old 11-14-2011, 03:20 PM
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White deposit, with black. I'd say injector.
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Old 11-14-2011, 03:25 PM
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how do you replace the injector ?
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  #8  
Old 11-14-2011, 03:42 PM
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Gotta remove the intake, that also means more than just injectors, but also gaskets. I looked on you tube for something to help, but nothing. I'd also add, replace all 8. You "may" have 1 bad, but going to this level, not replacing all of them just a matter of time befoer you'll be back into it.

Last edited by kevinkpk; 11-14-2011 at 03:46 PM.
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Old 10-24-2012, 12:48 PM
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Cold also be o2 sensors mine is doing it too. But my plugs are a rust color.
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Old 10-24-2012, 12:48 PM
 
 
 
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10, 1999, 2008, cap, change, chev, chevy, cyclinder, cylinder, distributer, misfire, plugs, spark, suburban, surban, tahoe


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