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#4087266 - 12/08/20 02:37 PM Intake manifold replacement
1Baker11 Offline
n00b

Registered: 02/16/19
Posts: 21
Loc: New York
Hello all
I am inquiring on my 2011 P7B 250k Car always runs amazing and fast and no issues. Shifts excellent. I just had a shop replace the intake manifold, it was leaking/losing coolant etc. Believe it was the original.
Upon getting it back, there is an ridiculous loss of power and acceleration, noisy and stalled once. I thought I was driving a different automobile. That is not this car. The shop checked vacuum, wires etc. and was all good. They did say they would make good on it and would possibly need to order a dealer one instead of the Napa one they repaired it with. You could imagine my disappointment. Any thoughts or similar experiences?? Thank you*

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#4087272 - 12/08/20 03:22 PM Re: Intake manifold replacement [Re: 1Baker11]
TheCableGuy Online   content
Climber

Registered: 04/08/19
Posts: 973
Loc: Far Northwest AZ
Not my experience but I have read many posts about those using the Dorman manifold and having nothing but issues. Maybe that’s your case? At least in this scenario they are taking responsibility.
_________________________
2010 P7B 150K. 11K hours. 3.27, RKE, Cruise, Ported stock plenum, JMod, ADTR sway bar, KYB rear shocks.
2011 Sierra 1500 155K, too many mods to list. (RIP 01-05-2019)
2001 Durango R/T 5.9. 230K. SOLD 5-1-19

I’m a classical textbook over-thinker.


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#4087282 - 12/08/20 05:04 PM Re: Intake manifold replacement [Re: 1Baker11]
1Baker11 Offline
n00b

Registered: 02/16/19
Posts: 21
Loc: New York
I agree. I think certain aftermarket parts for these police interceptors are not the correct way to go.

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#4087290 - 12/08/20 06:24 PM Re: Intake manifold replacement [Re: 1Baker11]
TheShadow Offline

Over the Hill

Registered: 05/01/07
Posts: 1735
Loc: SoCal High Desert
Agreed. Dorman (and a few dozen other 'brands' that were copies of Dormans) manifolds specified for PI engines don't have the same airflow as Ford's design...the runners are smaller. Easiest way to tell one of those cheaper copies is to look at the bolt holes for the COPs...all the Fords have threaded brass inserts, the copies are simply plastic unthreaded holes.

Edit: sourcing a Ford Performance manifold could save you a couple hundred over dealer prices...


Edited by TheShadow (12/08/20 06:27 PM)
_________________________
'95 P71, 5xx,xxx miles, Rebuilt tranny, 2.73. Lives as a cab, and will die as a cab. (Died-FrontEnder)
'96 P71, 640,xxx on original drivetrain. (Now parts car - T-bone & roll)(You should see the roof - A,B & C-pillars chopped on driver side)
New to list: '96 MGM (Nice! @ 35x,xxx), '97 CV P71, '98 CV P71, '00 CV P71, 01 P71 (2 of 'em) '03 CV P71 (Nice so far) (All Ford Zinc Yellow w/Black decals & trim) And the list is growing...........
Taxicab mechanic: I HATE DRIVERS!

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#4087298 - 12/08/20 08:22 PM Re: Intake manifold replacement [Re: 1Baker11]
1Baker11 Offline
n00b

Registered: 02/16/19
Posts: 21
Loc: New York
that is great info thanks!

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#4087304 - 12/08/20 08:40 PM Re: Intake manifold replacement [Re: 1Baker11]
1Baker11 Offline
n00b

Registered: 02/16/19
Posts: 21
Loc: New York
what about the water pump, does that have to be high performance?

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#4087310 - 12/08/20 09:17 PM Re: Intake manifold replacement [Re: 1Baker11]
Davidzq Offline
Member

Registered: 01/19/15
Posts: 420
Loc: Seattle, WA
Note that "Ford Performance" is a brand name.
It's the stock intake used on all 01+ panthers. Though it is the Performance Improved (PI) design. The Dorman is a copy of your older NPI design, which causes the loss of power when put on a PI engine.

You don't need a performance water pump, unless you're doing some serious mods to the motor and need better cooling to support that...
_________________________
David Hensley
Member of Northwest Panthers Car Club

2008 P71, Norsea Blue SAP
-Message Center cluster retrofit
-Towncar Signature L heated power seats
-Long overhead console
-Compustar remote start/security

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#4087314 - 12/08/20 09:30 PM Re: Intake manifold replacement [Re: 1Baker11]
1Baker11 Offline
n00b

Registered: 02/16/19
Posts: 21
Loc: New York
Ok great, very helpful. Can't wait until car is back to normal

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#4087316 - 12/08/20 10:35 PM Re: Intake manifold replacement [Re: Davidzq]
CrystalPistol Offline

Over the Hill

Registered: 10/16/01
Posts: 3035
Loc: Shenandoah Valley
Originally Posted By Davidzq
Note that "Ford Performance" is a brand name.
It's the stock intake used on all 01+ panthers. Though it is the Performance Improved (PI) design. The Dorman is a copy of your older NPI design, which causes the loss of power when put on a PI engine.

You don't need a performance water pump, unless you're doing some serious mods to the motor and need better cooling to support that...
Yes.

Look straight down the center of the engine behind the alternator, look at the very first intake runner to cross, ...

... does it come from the driver's side (#5)? If so, it is the newer PI design ...
... or ...
... does it come from the passenger side (#1)? If so, it is the older NPI design.

Dorman just updated the mating surfaces of the NPI to fit the PI, but the runners are the older NPI design. I think I've read the newer intake design was alone worth 12-15 hp.



Edited by CrystalPistol (12/08/20 10:57 PM)
_________________________
Problems? Read The Book. Signed: A natural borne "neanderthal", w/s.
____________________________________ __________________
Toreador Red 2001 Mercury Grand Marquis ..... with some minor mods.

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#4087368 - 12/09/20 12:31 PM Re: Intake manifold replacement [Re: 1Baker11]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7476
Loc: MA
Originally Posted By 1Baker11
and would possibly need to order a dealer one
That would be the most expensive choice. Try Tascaparts. That's the online sales arm of Tasca Ford and they offer a substantial discount over your local dealer. I've used them multiple times.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#4087370 - 12/09/20 01:07 PM Re: Intake manifold replacement [Re: 1Baker11]
1Baker11 Offline
n00b

Registered: 02/16/19
Posts: 21
Loc: New York
thanks!

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#4087394 - 12/09/20 06:17 PM Re: Intake manifold replacement [Re: 1Baker11]
TheShadow Offline

Over the Hill

Registered: 05/01/07
Posts: 1735
Loc: SoCal High Desert
Ditto on TascaParts ...they're usually very quick on the shipping end, too...

You could also check ADTR and Summit Racing...
_________________________
'95 P71, 5xx,xxx miles, Rebuilt tranny, 2.73. Lives as a cab, and will die as a cab. (Died-FrontEnder)
'96 P71, 640,xxx on original drivetrain. (Now parts car - T-bone & roll)(You should see the roof - A,B & C-pillars chopped on driver side)
New to list: '96 MGM (Nice! @ 35x,xxx), '97 CV P71, '98 CV P71, '00 CV P71, 01 P71 (2 of 'em) '03 CV P71 (Nice so far) (All Ford Zinc Yellow w/Black decals & trim) And the list is growing...........
Taxicab mechanic: I HATE DRIVERS!

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#4087402 - 12/09/20 08:17 PM Re: Intake manifold replacement [Re: 1Baker11]
Davidzq Offline
Member

Registered: 01/19/15
Posts: 420
Loc: Seattle, WA
This would be the part you want for 06+.
https://www.tascaparts.com/oem-parts/ford-intake-manifold-9w7z9424a

The 01-05 (99-04 Mustang) version is more common, but has an extra port for a coolant temp sensor, which your car doesn't have. You would need a 3/8" NPT plug to block the hole. This is the only difference between them.


You will also want to get the gaskets (same for 01-11, also the same gaskets as the 5.4), thermostat, and the heater return pipe (underneath the intake).

https://www.tascaparts.com/oem-parts/ford-gasket-4c2z9439cc
https://www.tascaparts.com/oem-parts/ford-tube-heater-water-9w7z18663a
Good opportunity to do spark plug and coil boots too.


Edited by Davidzq (12/09/20 08:21 PM)
_________________________
David Hensley
Member of Northwest Panthers Car Club

2008 P71, Norsea Blue SAP
-Message Center cluster retrofit
-Towncar Signature L heated power seats
-Long overhead console
-Compustar remote start/security

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#4087408 - 12/09/20 09:40 PM Re: Intake manifold replacement [Re: 1Baker11]
1Baker11 Offline
n00b

Registered: 02/16/19
Posts: 21
Loc: New York
Awesome**

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#4087416 - 12/09/20 10:21 PM Re: Intake manifold replacement [Re: 1Baker11]
Lance01 Offline
Member

Registered: 04/02/18
Posts: 411
Loc: Pa
Edit

This sounds really bad. Even a Dorman/napa intake won't make the car run as bad as you said it is. My car came with a Dorman and it ran fine but the Ford Racing intake I put on myself did make the car and transmission run so much better and she picked up at least 5-10HP.

The shop did a faulty install and they suck for letting you drive away like that. They should have noticed that on a test drive.

A few possibilities:

1. They didn't correctly torque down the intake manifold (too tight and broke it or too loose), used the wrong gaskets or didn't clean the surfaces properly.

2. They failed to check all 8 spark plug coils and 8 fuel injectors are correctly attached to the connections and are attached to the right cylinders to have the right firing order sequence.

3. They reused the old fuel injection O-rings.

4. Something simple like the air cleaner tube isn't attached and secure correctly.


I love these cars so much I'm almost contemplating driving to NY to find the actual problem but it is the shops problem now to make good on.

But for a shop to mess up on a simple fix like this I would loose confidence that they would fix it correctly and other shops don't like fixing another shops work. Tough call.


Edited by Lance01 (12/10/20 12:10 AM)

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