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Misfire on a cylinder

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  #1  
Old 07-15-2007
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Misfire on a cylinder

I have a misfire when you open the throttle under light to medium load, but it doesnt happen when i am cruising, and the check engine light hasent come on b/c of it. I have cleaned and re-gapped the spark plugs (doub-plat: so i doubt they are bad) and replaced the fuel filter. I know it could be the cat, but i doubt it becuase when I use full throttle from a dead stop it doesnt misfire. Any suggestions?

As well I have a clanking noise at idle but it doesnt seem to be a big deal just an annoyance. Anything for this?

Any suggestions would be appriciated.

~Alex
 
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Old 07-15-2007
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might want to look into a coil, check ur plug wires one of the could b burned
 
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Old 07-15-2007
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i doubt it is that b/c when i am going from 0-60 it doesnt mis-fire at all, and the check engine light isnt on at all which is very strange
 
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Old 07-15-2007
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ive had a burned sparkplug wire an it would do fine until i got over 50mph or so then it would sputter an buck an carry on... its jus an idea...might also c if ur maf sensor is dirty....unplug it an drive arround an c if ur truck runs better...if it does then u gots a bad maf sensor..also check ur fuel pressure if its not right arround 40 psi u could have bad fuel pump or cloged fuel filter
 
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Old 07-21-2007
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This all sounds pretty familiar with what going on with mine. When at idel my truck kinda has a low sounding pop in the exhasut and has a slight vibration to it, more than normal. Also when iam at cruising speed, 45-60 once in a while it sounds and feel like it miss a cylinder (not fireing the plug) it may happen once to twice a week. Now I have checked the primary and secondary sides of the ignition system, all with in factory spec. Checked the resistance of the plug wires and the spark plugs and regaped them, and all checking out ok. I moved to the EGR system, cleaned and checked all the EGR components, all seem to be working right. Also cleaned and checked the idle air control valve, MAF, and IAT sensor, still poping... Next week i'am having my truck hooked to a computer to see if i can find the problem that way. Any body else got any ideas. Iam stumped
 
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  #6  
Old 06-06-2008
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oops never mind
 

Last edited by GearBoxKevin; 06-07-2008 at 09:24 AM.
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