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YakAttack

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About YakAttack

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  1. So if you remove the rocker you can pull the pushrod out?
  2. So basically pull the oil drain plug and check it. Would it show any metal even though I went through an oil change since it started? What steps would I take in order to measure valve travel. Is that something I could do myself? When the cover is on I don’t get any strange noises, not any loud ticking or anything. Seems I would here something when idling that sounds broken.
  3. I have video with the valve cover off and rocker arms moving but it’s too big to post here
  4. The compression test ran by dealer showed good on all cylinders. I’m going to pull valve cover on Saturday if I can and do a little more inspecting. Thanks for the info.
  5. *Check engine light on *Service Stabiltrak lights on *RPM fluctuations and surges *Feel the engine miss inside truck *Computer reads code of PO305 misfire cylinder 5 , PO300 random misfire and PO171 System to lean bank 1 *Fire to coil *Fire to plug from wire *Fire from plug *Current going to injector (check with noid light) *Tried swapping coils but still get same misfire on cylinder 5 code *Compression good at all cylinders as per GM Dealer * *All injector orings changed *Intake gasket changed *oil pressure sender & filter changed *Throttle position sensor changed *Valve cover removed, ran engine and all rocker arms seem to be moving normally (have video on both sides)with engine running *didnt check for any play in rocker arms with engine not running My next move Saturday will be to remove valve cover and inspect the spring on 5 up and down. Loosen the rocker to see if I can get miss to stop
  6. I am going through exact same thing with same cylinder. Done a compression and leak down test and both came back fine.
  7. I have a 2012 GMC Sierra 5.3L SL. I will post all I have done up until this point. I brought to 2 different shops one being a GM service department. None of the shops have went into the engine any deeper than the top end. No head taken off. *Check engine light on *Service Stabiltrak lights on *RPM fluctuations and surges *Feel the engine miss inside truck *Computer reads code of PO305 misfire cylinder 5 , PO300 random misfire and PO171 System to lean bank 1 *Fire to coil *Fire to plug from wire *Fire from plug *Current going to injector (check with noid light) *Tried swapping coils but still get same misfire on cylinder 5 code *Compression good at all cylinders as per GM Dealer * *All injector orings changed *Intake gasket changed *oil pressure sender & filter changed *Throttle position sensor changed *Valve cover removed, ran engine and all rocker arms seem to be moving normally (have video on both sides)with engine running *didnt check for any play in rocker arms with engine not running Not sure what could be causing these issues or what else to do. Any help or info would be highly appreciated TIA.
  8. Never figured it out. I brought it to dealer and paid for a diagnostic test there. Compression, injectors, fuel pressure, plugs, wires, coil are all fine. All they could say was it seemed like more of in internal problem causing cylinder 5 to have that dead miss. I was told find a shop with a scope that can look at the internals was an option. Removing the valve cover and valley cover under the intake and check for stuck lifter which I already removed the valve cover before I didn’t see or feel as if anything was stuck. Never took off valley cover. I could bring to shop and pay $3000 to install new lifters or I could take the heads off myself and inspect it and try diagnosing what’s wrong. I want to trade it in but with how much I owe and how much I’d get with a vehicle missing like this I def think I’d be so far upside down. So i’m left with a decision to make
  9. Now the ANS light kicked on and the stabilitrak lights are staying on with it.
  10. For all of those who are following the post I didn’t get a chance to bring to dealer today before it was closing but was able to get a proper compression check. It got 180 psi at cylinder 1,3,5,& 7. Still when pulling just the plug in connector on coil #5 I am not getting any difference in engine sound as I do the others. Still I am getting spark from the plug on that cylinder. So we still at the confused point.
  11. I will end up bringing it to the dealer on Friday and let them check it out. Tell them what I done so far and observed and see what they find. The compression check he done to it on cyclinder 5. Wish he would have at least checked out another one. I don’t have a compression gauge and he is 2 hours away.
  12. I still don’t understand why when I pull connector on cylinder 5 coil it makes no noticeable change to the engine like the other 7 do.
  13. I swapped injectors. Swapped coils. Still get the same miss. I took valve covers off on both sides this morning. I took videos. All of the rocker arms are operating properly. No ticking coming from any of them
  14. I went got the noid light and looks like all injectors checked out just fine.
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