Intake Manifold Leaking

GP-SE · February 5th, 2012, 05:00 PM

Hey guys, I noticed I was a bit low on coolant today, looked around and saw the area around my thermostat (between stat and spark plug) was damp. I assume I need a new intake manifold as mine is warped? How are the Dorman replacements compared to OEM? Also roughly how much are new gaskets? as I assume the new Intake Manifold won't come with them?
Is it possible that this could cause bad fuel economy? I have always gotten bad MPG, and I don't drive hard/car is all stock. I'm thinking if this is warped perhaps the intake port right beside the thermostat area could be drawing in un-metered air? I get about 250miles/tank, 80% highway. car has 140,000miles
-2002 Mustang GT

Cabikejumper · February 5th, 2012, 05:04 PM

Don't get dorman.

Get the ford racing one off AM for. 169.00.

GP-SE · February 5th, 2012, 05:12 PM

I just ordered the one from American Muscle!!! Is there anything I should know when I install, or is it straight forward?
Do I need a new throttle body/plenum gasket? Also the new one doesn't come with intake manifold gaskets does it?

p4ndiamond · February 5th, 2012, 05:14 PM

Probably not. did you check to see that the T stat itself was not leaking ?

GP-SE · February 5th, 2012, 05:16 PM

i checked the t-stat and no leaks there, just where the aluminum meets the plastic you can see it's wet, but it's not pissing out which is good.

Cabikejumper · February 5th, 2012, 05:22 PM

Originally Posted by GP-SE

I just ordered the one from American Muscle!!! Is there anything I should know when I install, or is it straight forward?
Do I need a new throttle body/plenum gasket? Also the new one doesn't come with intake manifold gaskets does it?

The intake has gasket on it. You'll need the intake manifold gasket from ford.

Write up i made
Intake Manifold Removal/Reinstall

Cabikejumper · February 5th, 2012, 05:26 PM

Originally Posted by Cabikejumper

The intake has gasket on it. You'll need the intake manifold gasket from ford.

May want to pick up a few injector o rings pack of. 4 is like 2.15 at autozone. I ripped one of mine when installing.

Write up i made
Intake Manifold Removal/Reinstall

Hope this helps

GP-SE · February 5th, 2012, 05:41 PM

awesome write-up, thanks!!!

Eagle2000GT · February 5th, 2012, 11:23 PM

Originally Posted by GP-SE

Hey guys, I noticed I was a bit low on coolant today, looked around and saw the area around my thermostat (between stat and spark plug) was damp. I assume I need a new intake manifold as mine is warped? How are the Dorman replacements compared to OEM? Also roughly how much are new gaskets? as I assume the new Intake Manifold won't come with them?
Is it possible that this could cause bad fuel economy? I have always gotten bad MPG, and I don't drive hard/car is all stock. I'm thinking if this is warped perhaps the intake port right beside the thermostat area could be drawing in un-metered air? I get about 250miles/tank, 80% highway. car has 140,000miles
-2002 Mustang GT

Our intake manifolds have been known to crack That leaks coolant. But the that has absolutely nothing to do with unmetered air. Even if it did it would cause a lean condition not a rich condition.

P.S. You cannot measure fuel usage by the tank. You need to measure it by the gallon.

GP-SE · February 6th, 2012, 05:47 AM

Originally Posted by Eagle2000GT

Our intake manifolds have been known to crack That leaks coolant. But the that has absolutely nothing to do with unmetered air. Even if it did it would cause a lean condition not a rich condition.

P.S. You cannot measure fuel usage by the tank. You need to measure it by the gallon.

It actually would cause rich, because the O2 sensors would see lots of air (lean) and the PCM will add fuel. On a previous car I had a vacuum leak, and it caused the fuel trims to go way rich

SSG Pate · February 6th, 2012, 08:28 AM

Did you check to see if your bolt might have came loose? that would be my first move before I went ordering a new intake.

February 5th, 2012, 05:00 PM	#1
GP-SE Regular 2002 Mustang GT Join Date: Aug 2010 Location: Richmond Hill, Ontario Posts: 343 iTrader: 0 reviews	Intake Manifold Leaking Hey guys, I noticed I was a bit low on coolant today, looked around and saw the area around my thermostat (between stat and spark plug) was damp. I assume I need a new intake manifold as mine is warped? How are the Dorman replacements compared to OEM? Also roughly how much are new gaskets? as I assume the new Intake Manifold won't come with them? Is it possible that this could cause bad fuel economy? I have always gotten bad MPG, and I don't drive hard/car is all stock. I'm thinking if this is warped perhaps the intake port right beside the thermostat area could be drawing in un-metered air? I get about 250miles/tank, 80% highway. car has 140,000miles -2002 Mustang GT

February 5th, 2012, 05:14 PM	#4
p4ndiamond Hardcore Enthusiast 1997 Pacific Green Cobra 14.80 No traction Join Date: May 2010 Location: New Orleans Posts: 1,219 iTrader: 0 reviews	Probably not. did you check to see that the T stat itself was not leaking ? __________________ GT ENGINE (temporary) 4.30 Gears , 31 spline Moser axles , Detroit tru Trac diff, Jmod 4r70w , Pi intake Hitech stage 2 cam, Vortech V2 3.33 pulley. Alum drive shaft. Lowering kit x2 ball joints ,screamin demon coils, LCA "

February 6th, 2012, 08:28 AM	#11
SSG Pate Premium Member 00 Mustang GT Vert/88 5.0 Join Date: Sep 2010 Location: Tennessee Posts: 1,766 iTrader: 3 reviews	Did you check to see if your bolt might have came loose? that would be my first move before I went ordering a new intake. __________________ Proud Iraq and Afghanistan War veteran Powered By MMR 4.75L Stroker, Tuned at Kurgan Motorsports

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February 5th, 2012, 05:12 PM	#3
GP-SE Regular 2002 Mustang GT Join Date: Aug 2010 Location: Richmond Hill, Ontario Posts: 343 iTrader: 0 reviews	I just ordered the one from American Muscle!!! Is there anything I should know when I install, or is it straight forward? Do I need a new throttle body/plenum gasket? Also the new one doesn't come with intake manifold gaskets does it?

February 5th, 2012, 05:16 PM	#5
GP-SE Regular 2002 Mustang GT Join Date: Aug 2010 Location: Richmond Hill, Ontario Posts: 343 iTrader: 0 reviews	i checked the t-stat and no leaks there, just where the aluminum meets the plastic you can see it's wet, but it's not pissing out which is good.

February 5th, 2012, 05:41 PM	#8
GP-SE Regular 2002 Mustang GT Join Date: Aug 2010 Location: Richmond Hill, Ontario Posts: 343 iTrader: 0 reviews	awesome write-up, thanks!!!

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