4.0 exhaust leak

4.0 power · 01-02-2010, 09:42 PM

while changing the oil the other day, i noticed this weird noise coming from the left bank of the motor while running. i have a full borla exhaust (headers to tailpipe) and its still in good shape so i find it hard to believe it could be a failed weld, etc. Cant say power is down, but fuel mileage has taken a huge dump this tank though which raised my eyebrow.

didnt notice any discoloration on the header either.

my question, to those who have a borla exhaust, have you experienced a failure of that type?

next question, what sound does a bad header gasket make? or what should i look for?

**AllanD** · 01-03-2010, 06:16 PM

My borla headers are on the floor under my workbench.

why? because one of the tubes cracked along wht wekd to the collector.

After taking them off I found other cracks, now there's nothing I can't get welded, but rewelded headers often crack again and I didn't want to be dealing with that in December/January/February, so I put cast manifolds back on it.

I'll deal with it later.

But don't believe that your Borla's can't crack,
I can absolutely assure you that they most definatly can!

AD

01-02-2010, 09:42 PM	#1
4.0 power New Member Join Date: Oct 2007 Posts: 14 Rep Power: 0 iTrader: (0)	4.0 exhaust leak while changing the oil the other day, i noticed this weird noise coming from the left bank of the motor while running. i have a full borla exhaust (headers to tailpipe) and its still in good shape so i find it hard to believe it could be a failed weld, etc. Cant say power is down, but fuel mileage has taken a huge dump this tank though which raised my eyebrow. didnt notice any discoloration on the header either. my question, to those who have a borla exhaust, have you experienced a failure of that type? next question, what sound does a bad header gasket make? or what should i look for?
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01-03-2010, 06:16 PM	#2
AllanD RBV Technical Advisor Join Date: Jun 2001 Location: East-Central Pennsylvania Year: 1987... sorta Make: Ford Model: Ranger Supercab Engine: '93 4.0 Class: 4x4 Used For: Roadtrip Warrior Posts: 7,169 Rep Power: 47 iTrader: (18)	My borla headers are on the floor under my workbench. why? because one of the tubes cracked along wht wekd to the collector. After taking them off I found other cracks, now there's nothing I can't get welded, but rewelded headers often crack again and I didn't want to be dealing with that in December/January/February, so I put cast manifolds back on it. I'll deal with it later. But don't believe that your Borla's can't crack, I can absolutely assure you that they most definatly can! AD __________________ Gun Control - A theory espoused by some monumentally stupid people; who claim to believe, against all logic and common sense, that a violent predator who ignores the laws prohibiting them from robbing, raping, kidnapping, torturing and killing their fellow human beings will obey a law telling them that they cannot own a gun.
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