I CANT FIGURE OUT MY RANDOM CYLINDER MISFIRE IN ALL 6 CYLINDERS.

  • Tiny
  • kodyclarence
  • Member

Ok. Well ill check fuel pressure and change the fuel filter first. I can imagine that is cheaper than the PCM. I have had the vehicle for 2 years now and haven't changed the fuel filter and I highly doubt the people that had it before me did either. Ill throw some Sea Foam in the tank afterwards as well. If that doesn't solve the issue and I get a new PCM will I have to get it flashed like an ECM?

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Sunday, October 7th, 2012 AT 2:38 PM
  • Tiny
  • KHLow2008
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  • 41,976 posts

Changing the fuel filter is not as easy as it seems for the V6. You might have problem accessing it and according to the manual, the tank has to be drained and partially dropped.

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Sunday, October 7th, 2012 AT 2:51 PM
  • Tiny
  • kodyclarence
  • Member

That's ok. I've got a car lift and a transmission Jack. I noticed that it sputters and misfires A LOT more when I have overdrive off. I usually drive with it on.

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Monday, October 8th, 2012 AT 2:14 AM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

With OD off, the engine would be runnig at a higher rpm and with more engine torque, the misfiring shoud be felt less.

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Monday, October 8th, 2012 AT 2:26 AM
  • Tiny
  • kodyclarence
  • Member

It runs around 3500 RPM with OD off on the highway and it does misfire and sputter a lot more. Then when I turn overdrive on and the RPMs drop it stops. Sputtering and misfiring as much.

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Monday, October 8th, 2012 AT 2:39 AM
  • Tiny
  • KHLow2008
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  • 41,976 posts

Get the fuel filter replaced and see if it makes any changes.

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Monday, October 8th, 2012 AT 3:14 AM
  • Tiny
  • kodyclarence
  • Member

Ok. Ill do that.

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Monday, October 8th, 2012 AT 6:44 AM
  • Tiny
  • kodyclarence
  • Member

I changed the fuel filter. It was bolted to the frame so I did not need to drop the tank. But it is still misfiring : /

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Friday, October 12th, 2012 AT 11:57 AM
  • Tiny
  • KHLow2008
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  • 41,976 posts

Are the trouble codes still showing the same codes or are there any additional codes?

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Friday, October 12th, 2012 AT 12:43 PM
  • Tiny
  • kodyclarence
  • Member

They're all the same.

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Friday, October 12th, 2012 AT 4:32 PM

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