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mattd
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mattd Enthusiast

mattd

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Ignition Coil B - Primary Control Circuit/Open.

 

Medical issue over the fall/winter, farm truck didn't go to the farm and sat for 5-6 months.  Idles crappy and throwing this code.  Pretty sure it is, or was caused by old gas.  I've run a fresh tank thru it and recently put a bottle of seafoam in 1/8 a tank and no improvements.  

 

Where should I start?  still need to check plugs, and maybe give wires a once over.  Injectors seem likely.  Guess I should probable swap coils to see if the issues moves cylinders.  Any other thoughts before I start spending real money?  

davester Senior Enthusiast

davester

Posted
Posted

Did you spray the ignition wires with that old gas? Otherwise, how do you think the gas would affect the ignition circuits?

 

Examine the wiring would be the first thing I'd suggest, given it was stored at a farm, so critters abound.

mattd Enthusiast

mattd

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Posted

Pretty sure it's old gas.  but not 100%.  if it was wires it would be critters.  just thinking of all the things that could throw that code.

davester Senior Enthusiast

davester

Posted
Posted

charm.li will have the diagnostic procedure for that code, specific to your truck, assuming you've posted in the correct section, as you haven't included any information about what truck/engine you have.

mattd Enthusiast

mattd

Posted
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it was critters.  chewed the wires of the coil on cyl 2.  

 

what are the chances i can put a new plug on the existing wires?  vs getting a whole new wiring harness.  

 

2000 sierra 5.3.

 

thanks, 

cyl2.jpg

davester Senior Enthusiast

davester

Posted
Posted

assuming it's not also chewed elsewhere, I'd cut a pigtail off at the junkyard or you can buy a new pigtail and hook it up.  I would use sealing butt joint connectors, not the dirt cheap crimp on plastic jobs, so it's sealed from moisture.  Then tape it up and off you go.

 

Oh yeah, offset the joints, so they aren't all in the same spot and make a big bulge in the harness, space them out.

diyer2 Senior Enthusiast

diyer2

Posted
Posted

I would solder the new pigtail on and then use shrink tube to seal  it. It's not fun but it can be done, been there.

Will last a long, long time.

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