This is topic Stumped! in forum Tech Talk at Northern California Ford Owners  .


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Posted by RedLned (Member # 4746) on :
 
Hey All, i'm new to caFords so thanks for having me....so here is my problem....october 2003 i ran a 13.9@98.09 at firebird raceway FFW. At that time, I had stock good year tires, MAC cold air, flowmaster mufflers, tri-axe, and steeda underdrive pullies.. I had put the pullies on about a week before. intake was on for at least 5 months. On the way back from arizona, my check engine light came on. after a few days it turned off but i took it to ford anyway. They said there was no code entered in the system. To date, i have added frpp 3.73, BFG Gforce KD 255/40-17, My current runs at infineon have been in the 14.3 range with consistant 2.00sec 60ft. When i drive aggresivly the check engine light seems to come on, my friend told me it might be the intake? Also, i hear a faint whistle from under the car....i'm pretty sure I have an exhaust leak as well. If anyone can help that would be great, I really have no idea why i'm running so slow. Thanks! 2003 Gt 5speed ::Mac Lowering Springs, Mac CAI, Steeda Underdrive pullies, Steeda Tri-Axe, Flowmaster Mufflers, Bfg Gforce KD 255/40-17
 

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Posted by The Punisher (Member # 4333) on :
 
you have a vacuum leak somewhere on the intake manifold. That is causing you the power loss.
 

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Posted by RedLned (Member # 4746) on :
 
easily fixed?
 

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Posted by BlackNGold (Member # 655) on :
 
First off I would judge the cars performance more on trap speeds rather than ET's...Trap speeds reflect the cars power more...

Your friend could be right on the intake effecting your computer...Try switching your intake back to stock at the track and see if it makes a difference....

Good luck...
 

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Posted by 88DroptopGT (Member # 2535) on :
 
If it is a vacuum leak, then it is easily fixed. You either re-connect the line that is loose or replace it with some similiar sized tubing from Vatozone or Kragen.
 

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Posted by RedLned (Member # 4746) on :
 
Alright thanks, I installed my intake about 5 months before the light came on, so i'm hesitant about that. Is there a possibility of cracked manifold?
 

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Posted by 94gt (Member # 3060) on :
 
Check around for cracked vaccum lines, I found 3 partially cracked ones when I saw one that was a clean break oneday... an ounce of prevention can save a lot of headache

also, if noone else has said it, welcome to the board
 

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Posted by RedLned (Member # 4746) on :
 
Thanks man, glad to be here. Well some peices of the intake were loose so i'll check that out. Going to infineon next weds so ill test it out. Thanks again!
 

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Posted by RedLned (Member # 4746) on :
 
So i bought a code scanner at kragens today and pulled my check engine light code. "cylinder 4 misfire" What could cause that? Spark Plug? Running Rich? Thanks guys
 

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Posted by The Punisher (Member # 4333) on :
 
cap, rotor, or wires might be out.
-David
 

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Posted by 66 AC COBRA (Member # 904) on :
 

quote:

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Originally posted by The Punisher:
cap, rotor, or wires might be out.
-David

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i think the cap and rotor isnt the problem , on a 4.6gt

but yeah i would change all the spark plugs and them make sure all the wires are pushed on all the way, they probably need to be changed anyway
 

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Posted by MrMagooo (Member # 2542) on :
 
hey if u figure it out tell me i keep throwing up number and number 7 misfire code and can't figure it out. i change the coils from #1 to 4 and #5 to 7 and still have the problem, then changeed the spark plugs and still have the rpoblem, so i went as far as changing the injectors and still the problem, i was also told a vacuum leak but haven't found one yet but am still looking
 

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Posted by RedLned (Member # 4746) on :
 
i found a crack on my mas so im sealing that up, maybe thats the vacume leak...what mods have you done to your car?
 

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Posted by MrMagooo (Member # 2542) on :
 
cold air, 75mil throtle body, bssini x pipe with cat,flows,c&l upper plenum,short throw,clutch quadrent, adjustable cable and fire wall adjuster, 3.55 gears with ta cover,diablo chip which has never worked need to have it retuned,the rest has been in body stiffening and suspension everythings been on for awhile didn't thorw codes until month or so ago
 

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