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Head Gasket?

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Old Mar 10, 2009 | 11:43 PM
  #1  
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Default Head Gasket?

When my car hits around 3k RPM, It starts to misfire/backfire and spit a little bit. When the car is in neutral it doesn't do it as much, but especially in first gear when I get the car going the severity of the problem sometimes increases. I took it to a Ford dealership and they "think" it's a blown head gasket. I put a new cap and rotor in. wires were installed new in July, along with plugs. The dealership techs also said the #2 plug is rusty. I'm not seeing anything burning or any smoke nor smell. I also just replaced the O2 sensors. Also the fuel injector on #2 was replaced with a new one. On a compression test he said #2 had about 92psi(i think psi, idk) and it should have around 110psi.
Old Mar 10, 2009 | 11:45 PM
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Is there oil in the coolant tank
Old Mar 10, 2009 | 11:48 PM
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I didn't see any.
Old Mar 10, 2009 | 11:51 PM
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Is the engine making any weird sounds like a ticking
Old Mar 11, 2009 | 06:58 AM
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nothing i haven't ever heard before, no.
Old Mar 11, 2009 | 12:19 PM
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There is a multitude of things that could cause the cylinder to have a low pressure reading

Blown head gasket
Worn Rings
Valves not seating properly (Bent valves)
Cracked block
Cracked heads
Cracked Piston
Bad Compression Test

I would start with the last one, I never trust anyone else unless i see it with my own eyes.
Old Mar 11, 2009 | 07:59 PM
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But a bent valve he would hear a knocking noise/ticking in the engine bay how many miles are on this bad dog and yeah far as compression goes thats low
Old Mar 11, 2009 | 09:24 PM
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Simple enough to see if it's the head gasket...Just pay attention to the coolant level in your radiator. If it decreases, you know the coolant is getting burned up. You can also put your hand behind the tail pipe, and let the exhaust condense on the palm of your hand for a few seconds...If it smells like antifreeze then you know.
Old Mar 11, 2009 | 10:15 PM
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he said he didnt smell anything but yeah do that and pull a spark plug and see if its got a white/grayish film on it
Old Mar 11, 2009 | 10:30 PM
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Originally Posted by FordMustangXBA
Simple enough to see if it's the head gasket...Just pay attention to the coolant level in your radiator. If it decreases, you know the coolant is getting burned up. You can also put your hand behind the tail pipe, and let the exhaust condense on the palm of your hand for a few seconds...If it smells like antifreeze then you know.
THAT doesn't always work, often times cylinder pressures are greater than cooling system pressures and what happens is on slight blows the exhaust gases are forced into the cooling system and super heat the coolant causing overheat condition and no loss of coolant except when coolant is spewed into the overflow bottle when the cap pops off excess pressure at 16 lbs.



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