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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 06-23-2014, 07:28 PM   #1
matheus.mattia
 
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Default Loud exhaust explosions, too much carbonization and fuel after the throttle valve

While disassembling the throttle body, I noticed that had too much carbonization and fuel (actually leaked as can be seen on photo) right after the throttle valve (I had cleaned about 1 year ago)... Is this normal? Another problem that I have is the exhaust (it's seems to be) explode(really loud pops) some times when I accelerate and leave the car go by the inercia...

Why is there fuel there? Bad valve timing? And is this causing the exhaust pops?

Thanks!
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Old 06-23-2014, 08:28 PM   #2
dawson1112
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The only way I know of for fuel to enter the throttle body is through the fuel pressure regulator. If it is bad it will let fuel leak past into the intake. Pull the vacuum line off of the FPR and if it is wet with fuel then it needs replaced.

The popping is from having an excess amount of unburnt fuel in the exhaust.
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Old 06-23-2014, 10:29 PM   #3
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Quote:
Originally Posted by dawson1112 View Post
The only way I know of for fuel to enter the throttle body is through the fuel pressure regulator. If it is bad it will let fuel leak past into the intake. Pull the vacuum line off of the FPR and if it is wet with fuel then it needs replaced.

The popping is from having an excess amount of unburnt fuel in the exhaust.
I'm gonna check this tomorrow... But a bad FPR will result in an excess amount of unburnt fuel in exhaust or the problems aren't related?

Thanks!!
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Old 06-23-2014, 11:03 PM   #4
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Bad fuel pressure regulator with a leak in the diaphragm will buld to much pressure and also fuel sucked into the vacuum line to the intake gets pulled into the cylinders as well.
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Old 06-24-2014, 05:05 PM   #5
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Quote:
Originally Posted by dawson1112 View Post
Bad fuel pressure regulator with a leak in the diaphragm will buld to much pressure and also fuel sucked into the vacuum line to the intake gets pulled into the cylinders as well.
It wasn't wet, any other guesses?
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Old 06-24-2014, 05:05 PM
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