5.0 Cobra intake swap made my car slower???

Scorcher2005 · Apr 12, 2005

hmmm, u say you punch it but feel no go. try this:
pull off your air intake tube and have some one hit the gas pedal (while the car is off, of coarse). look in the throttle body to see if the butterfly valve fully opens. if not, adjust your throttle linkage.

DMAN302 · Apr 12, 2005

Scorcher look up I say look up..

emeraldcoupe · Apr 13, 2005

don't the crown vics use a 14lb injector?

Scorcher2005 · Apr 13, 2005

DMAN302 said:
Scorcher look up I say look up..

heh, sorry. i didnt feel like reading through all the advice already given so i just went ahead and posted my own.

Killer50stang · Apr 13, 2005

91foxbodygt said:
you know how the stock manifold and the cobra uppers are different. they differ on the upper intake hoses.
also the pipe that comes from the lower manifold [in the rear] to the upper throttle body spacer in the stock intake, well on the cobra there is no tb spacer so that pipe, i had to connect it without passing it trough the tb spacer.

Have to agree on timing here. If you're timing is off then you will run hotter than normal. Changing an intake shouldn't make any difference. Did you mess with the timing at all? Set it 8-10, should work for you. Make sure that injector you used for replacement is a 19lb. (orange colored).

Thenemesis · Apr 13, 2005

JOHNS GT said:
don't the crown vics use a 14lb injector?

why would they stick a 19lb injector in a granny car? lol i think thats your problem.. one cylinders coughin lol

blksnshn68 · Apr 13, 2005

May sound like a dumb question, but did you set the timing with the spout disconnected?

emeraldcoupe · Apr 14, 2005

Thenemesis said:
why would they stick a 19lb injector in a granny car? lol i think thats your problem.. one cylinders coughin lol

i'm not the only one who caught that, huh. i'm almost positive the crowns used a 14lb injector. i have a few extra 19's laying around if you need one.

Killer50stang · Apr 14, 2005

JOHNS GT said:
i'm not the only one who caught that, huh. i'm almost positive the crowns used a 14lb injector. i have a few extra 19's laying around if you need one.

Lol!!! You should have done a little research on that first. Is the crown vic injector the same color as your others?

91foxbodygt · Apr 14, 2005

well the injector i put was also orange, almost all the digits were identical except for the last one.
i have heard trucks, family cars, and even 6 cyl stangs have 19lb---??? dont know for sure
hopefully it isnt the injector but just something as simple as the timing
just in case it is, how much would you sell the 19pounder for John???
I checked and yes the throttle boddle is opening all the way when the pedal is pushed on.
i havent gotten around to checking for leaks though
im still using EGR
another thing which is weird is that when i launch it the handbrake sign turns on around 3000rpm....???then when i let off it goes away
---15.8 baby-- :damnit:

emeraldcoupe · Apr 15, 2005

91foxbodygt said:
well the injector i put was also orange, almost all the digits were identical except for the last one.
i have heard trucks, family cars, and even 6 cyl stangs have 19lb---??? dont know for sure
hopefully it isnt the injector but just something as simple as the timing
just in case it is, how much would you sell the 19pounder for John???
I checked and yes the throttle boddle is opening all the way when the pedal is pushed on.
i havent gotten around to checking for leaks though
im still using EGR
another thing which is weird is that when i launch it the handbrake sign turns on around 3000rpm....???then when i let off it goes away
---15.8 baby-- :damnit:

pm me your address and you can have it

BlackGT89 · Apr 15, 2005

91foxbodygt said:
...
another thing which is weird is that when i launch it the handbrake sign turns on around 3000rpm....???then when i let off it goes away
---15.8 baby-- :damnit:

Check the brake fluid level & add as needed.

darthcual · Apr 15, 2005

You sed the manny came with a one inch spacer. Did you put a gasket between both sides of the phenolic spacer if not that could be your vac leak.

strtracer442 · Apr 15, 2005

Running hotter and no acceleration sounds like a vacuum leak to me.When I installed the Cobra intake on my 89, I picked up bottom,mid and top end. Knocked off .3 on ET

StangLou · Apr 15, 2005

91FoxBodyGT you are my SAVIOR!!!

Thats exactly what I need to see to figure out how to wire the underneath of my intake.

Not trying to hijack, but YOU DA MAN!!!

50bomber · Apr 15, 2005

Ok, nothing brilliant to add here, but when I installed my Eddy for the first time (now x3), I used the FMS/Felpro 1262 intake gasket ( ) that had these weird ass bolt holes in the middle of coolant ports, which I neglected to trim, and that made my car run a little hotter (like 1 bar higher) as well as having a coolant surge before the thermostat opened. Since then I ditched the damn gasket and got me a different Felpro gasket from PepBoys, the one with rubber endseals ( ) for $20, which had the correctly shaped coolant ports. And oh yeah, my stock headead/cam car picked up hp/tq all over the powerband after just the Edelbrock install, so I agree that it must be something else like a vacuum leak.

91foxbodygt · Apr 15, 2005

well when i put the spacer i did put both gaskets, top and bottom, but i learned the hard way. the intake got scarred for life since i still have the stock hood. but even with the spacer it felt slow. i took if off and reused one of the gaskets just like that. without dots of silicone or anything. my best guess is that it might be the timing because its on 12. i've heard 10 is normal. you guys think this is it???

91foxbodygt · Apr 15, 2005

by the way, your welcome lou. nice to know i helped. without that pic i would have been lost too! lol

just4bob50 · Apr 16, 2005

i definitly think that there are vacume problems. 1. if you have a vac. leak its past the point where air and fuel are metered, which can cuase your motor to run hotter than normal. 2. If it is a vac. leak that is bad enough to effect idle your car will not make full fuel pressure at W.O.T. fuel pressure could be down by as mucch as 10 psi. 3. if your TPS is no set write it will compound any other problems. 4. if your dist. was even 1 tooth off from where it was sopposed to be you wouldnt of even run 15.8 in the 1/4. 5. If you ran your vacume lines inccorectly nothing you do will help untill there write. As for cars getting slower with a street level intake change, almost all that i know of are from impropper install in some form.

ninty1gt · Apr 17, 2005

wuts up im new, we'll i had the exact same problem when i installed my typhoon intake, and it was a vacumm leak from the fuel injectors, u need to change out the o rings, i can bet 100 that, that is the problem

5.0 Cobra intake swap made my car slower???

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