Backfiring through Intake!!!!
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Backfiring through Intake!!!!
I need some help guys,The story
Just the other day I started my 06 f350 6.0 which has a egr deleted brand new oil cooler and both HPOP's and it had a occasional miss with the typical #5 or 6 Injector balance default code on my Edge so I had a guy put a injector in but that wasnt it and he said its backfiring through the intake and low compression on that cylinder #5 or 6,Now he wants to charge me 4,500 for a head gasket and stud job plus whatever he says a machine shop would be to do a exploratory on whats wrong with it,Other people have said that they dont think its a head removal issue most likely a broken valve spring or even a bent pushrod
....
I dont have the cash for that expensive of a repair and will have to do this myself so please guys help me figure out whats wrong I have allready figured out that I bought a lemon(8k in repairs to date in less then a year) and just need to fix it to trade on another Powerstroke or a
Cummins
Just the other day I started my 06 f350 6.0 which has a egr deleted brand new oil cooler and both HPOP's and it had a occasional miss with the typical #5 or 6 Injector balance default code on my Edge so I had a guy put a injector in but that wasnt it and he said its backfiring through the intake and low compression on that cylinder #5 or 6,Now he wants to charge me 4,500 for a head gasket and stud job plus whatever he says a machine shop would be to do a exploratory on whats wrong with it,Other people have said that they dont think its a head removal issue most likely a broken valve spring or even a bent pushrod
....
I dont have the cash for that expensive of a repair and will have to do this myself so please guys help me figure out whats wrong I have allready figured out that I bought a lemon(8k in repairs to date in less then a year) and just need to fix it to trade on another Powerstroke or a
Cummins
Logistics Pro
Joined: Mar 2013
Posts: 4,097
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From: Kissimmee,Fla
I would fix what you have if it's a nice truck, it only going to cost you more on another used truck unless your going to buy new. Stay away from the come a parts they aren't all they say and have their own issues.......just my 2 cents
Lead Driver
Joined: Feb 2011
Posts: 8,241
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From: L.A. (Lower Alabama)
Put shop air on suspect cylinder through glow plug hole and listen for leaks. Burnt, bent, broken valves will show up easily. Bent push rod isn't the issue. Broken valve spring-maybe but very unlikely. You can pull valve cover to inspect springs. Bent valve stem may be binding in valve guide also. All this stuff usually happens when an object like a bolt or injector tip gets loose in the cylinder.
I'd do a bit of checking first but unfortunately I agree, the head(s) is more than likely going to have to come off.
I'd do a bit of checking first but unfortunately I agree, the head(s) is more than likely going to have to come off.
Hotshot
Joined: Apr 2010
Posts: 19,072
Likes: 242
From: Saratoga Springs,UT
I will 3rd the Dodge deal Had a Dakota Brand NEW 2003 (6 or 7 Miles on it when I got) and Lots of parts went out Like steering Collums,Balljoints,sensors and the Rear Main Seal was the Final Straw
Hell it was still in the 3/36 warrenty when I traded it
It Had a Service 4X4 LIGHT Turn On within 20 Miles so that would have been only well the Next A.M. on the Way to work it turned on
Didn't even have it 12hours LOL and Service Vehicle Lights were On
Hell it was still in the 3/36 warrenty when I traded it
It Had a Service 4X4 LIGHT Turn On within 20 Miles so that would have been only well the Next A.M. on the Way to work it turned on
Didn't even have it 12hours LOL and Service Vehicle Lights were On
Hotshot
Joined: Apr 2010
Posts: 19,072
Likes: 242
From: Saratoga Springs,UT
Put shop air on suspect cylinder through glow plug hole and listen for leaks. Burnt, bent, broken valves will show up easily. Bent push rod isn't the issue. Broken valve spring-maybe but very unlikely. You can pull valve cover to inspect springs. Bent valve stem may be binding in valve guide also. All this stuff usually happens when an object like a bolt or injector tip gets loose in the cylinder.
I'd do a bit of checking first but unfortunately I agree, the head(s) is more than likely going to have to come off.
I'd do a bit of checking first but unfortunately I agree, the head(s) is more than likely going to have to come off.
He Must Test at TDC (Top Dead Center) For this Test or Close
Tha Intake/Exhaust Valve cant be Open
Timing will apply
Can you Post the Exact DTC??
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Now it has 2 DTC but they both seem to be linked they are
P0278 #6 cylinder balance default
P0300 Random cylinder misfire
the 2nd one leads me to think head gasket for sure what do you guys think?
P0278 #6 cylinder balance default
P0300 Random cylinder misfire
the 2nd one leads me to think head gasket for sure what do you guys think?
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Hotshot
Joined: Jul 2005
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From: Middle Tn.
Have you checked the ficm voltages? Cheap and quick.
Logistics Pro
Joined: Dec 2004
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From: South Weber, Utah
Agreed TDC on the compression stroke.
Lead Driver
Joined: Mar 2010
Posts: 5,505
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From: Woodbridge, Ontario, CA
Just by the information provided by the OP, it is very evident that a base engine issue exists causing a cylinder's exhaust valve not to open. This can be caused by either a bent pushtube and/or broken rocker arm.
Logistics Pro
Joined: Mar 2013
Posts: 4,097
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From: Kissimmee,Fla
No Rusty, if the intake valve is not opening the compression has no other place to go but through the intake. This is what makes the poping noise that he is hearing. It could be a bad lifter or cam shaft too.
Lead Driver
Joined: Feb 2011
Posts: 8,241
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From: L.A. (Lower Alabama)
Well, obviously I have a misconception about this situation. I don't doubt anything m-chan posts, Hopefully I'm not too old to learn something. 
Per4mance, if the intake valve isn't open (or damaged) how does the compression get from the cylinder back into the intake manifold? Or are you talking about compression from the turbo?
The only thing I can think is maybe the exhaust valve not opening is delaying the combustion long enough for the piston to get over TDC and it's still lit when the intake valve opens?
Per4mance, if the intake valve isn't open (or damaged) how does the compression get from the cylinder back into the intake manifold? Or are you talking about compression from the turbo?
The only thing I can think is maybe the exhaust valve not opening is delaying the combustion long enough for the piston to get over TDC and it's still lit when the intake valve opens?
