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Author
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Topic: help! question about fuel presure and idle and vacume,please help?
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phat50
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Member # 1998
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posted
 
 
well when i start my car and my fuel presure is at 40psi with the vacume off it will surge really bad and try to cut off,but if i set it to 35psi with vacume off it will idle ok,and if i set it to 30psi with the vacume off it will idle perfect,anything higher than 35psi and it will surge really bad and try to cut off only when i start up the car,if i unplug my cap off the vacume line on the back of my preformer intake it will kick up the idle a little and idle fine,then i plug it up and it will try to die,i dont have any vacume leaks,what could it be?code scanner said problem with air injection system or fuel system circet,i have 24lb injectors,gt-40 heads,e303 cam,and preformer intake just to name a few things im working with.
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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vpr_klr
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Member # 3353
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posted
what year is your car?
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Project crustang has begun
14 mustangs and counting...
Posts: 893 | From: Livermore | Registered: Oct 2003
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phat50
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Member # 1998
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posted
my car is a 90.
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Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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Hungry Hippo
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Member # 537
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posted
quote:
Originally posted by phat50:
but if i set it to 35psi with vacume off it will idle ok,and if i set it to 30psi with the vacume off it will idle perfect
problem solved
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05 S4 Avant(wagon)
09 C6 H/C/I
Posts: 2959 | From: east bay | Registered: Nov 2001
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phat50
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Member # 1998
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posted
isent that too low,like lower than stock fuel presure.
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Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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Hungry Hippo
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Member # 537
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posted
no, its not too low because once you change the maf and fuel injectors, stock fuel pressure is irrelevent. a lot of us are running 35 psi or even less. just drop it down and see how it runs
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05 S4 Avant(wagon)
09 C6 H/C/I
Posts: 2959 | From: east bay | Registered: Nov 2001
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phat50
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Member # 1998
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posted
it run cool with 30psi with the vacume off and 35psi with vacume off,but i hear stock fuel presure is like 35 or 38psi and some people are running up to 40 psi with 24lb injectors and theres idle fine,mine wont unless its at 30psi or 35psi and no higher with the vacume off,is that normal?
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Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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GOT 50
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Member # 1960
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posted
i run 32 with vacume off
Posts: 2139 | From: SF/DALY CITY/MILLBRAE | Registered: Oct 2002
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phat50
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Member # 1998
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posted
erick,dose your car surge if you give it more fuel presure?
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Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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phat50
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Member # 1998
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posted
would i be running lean with 35psi or 30psi with the vacume off?i have a 190lb pump 24lb injectors.
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Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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phat50
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Member # 1998
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posted
dose anyone else run fuel presure around 30psi-35psi with 24lb injectors?
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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phat50
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Member # 1998
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posted
anyone????
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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