Gasoline in my intake manifold and EGR?

88CougarMan

Founding Member

Jun 13, 2000

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39

Flower Mound, TX

Jan 27, 2004

#1

• Jan 27, 2004

• #1

I have been having rouble with my EGR for the past year or so, and I finally got around to replacing it. A while ago I took off the upper intake manifold and noticed there was a lot of gasoline coated on the inside walls of the manifold, and that troubled me. When I replaced my EGR today I noticed the old one had gasoline dripping off of the cone-shaped valve. What would be causing gas to be recirculated through my EGR and thrown back into my intake manifold? I have always had a rough idle, is this causing the rough idle?

 

jrichker

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Mar 10, 2000

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Dublin GA

Jan 27, 2004

#2

• Jan 27, 2004

• #2

Probable leak in the fuel pressure regulator diaphram.

Disconnect the vacuum line from both ends, and see if fuel drips out when you blow through the line. Start the car and watch the vacuum port on the regulator. If it drips or squirts fuel, the diaphram is leaking.

 

88CougarMan

Founding Member

Jun 13, 2000

477

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Flower Mound, TX

Jan 27, 2004

#3

• Jan 27, 2004

• #3

Unless I've gone retarded, I just can't figure out how a leak in the FPR would cause gas to enter the manifold near the EGR and TB?

 

88CougarMan

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Flower Mound, TX

Jan 27, 2004

#4

• Jan 27, 2004

• #4

TTT

 

jrichker

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Dublin GA

Jan 28, 2004

#5

• Jan 28, 2004

• #5

The fuel pressure regulator diaphram leaks fuel into the chamber where the manifold vacuum works on the diaphram. The vacuum in the chamber reduces the fuel pressure according to engine vacuum. If the diaphram leaks fuel into the vacuum chamber, then it sucks it into the intake manifold.

 

88CougarMan

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Jun 13, 2000

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Flower Mound, TX

Jan 28, 2004

#6

• Jan 28, 2004

• #6

Ok, that makes sense. After class today I'll check it out the FPR.