This is topic e303 what is the correct vac at idle? in forum Tech Talk at Northern California Ford Owners  .


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Posted by slikstang (Member # 4652) on :
 
i just finished putting together a 5.0 with stock lower, gt-40 heads and stock intake manifold. it's an 88 so i converted it to mass air... got the car set at 10 deg before tdc with the stout out and the idle is at 800 and engine shakes a lot.. also the idle is very lumpy. after driving it the car seemed to hesitate a lot. the vac at 800 is only around 7-10. injectors stock and stock fuel pump. do i need upgraded fuel and a chip.... anybody with an e303 what does your vac look like.


thanks
kevin
 

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Posted by Cobra5.0JEEP (Member # 1482) on :
 
My vac is at 13 at 900rpms
 

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Posted by Fostang (Member # 3752) on :
 
8-10 average or more is fine.
 

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Posted by slikstang (Member # 4652) on :
 
so then you think that it's the fuel that he's missing becasue there is just no power right now.

thank
kevin
 

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Posted by MISTA EE (Member # 4594) on :
 
I have an 86 5.0 and i just installed an e-303
cam, e7te heads, gt-40 upper and lower, 75mm t/b and spacer, long tube headers and off road h-pipe. I too have stock injectors but upgraded my
fuel pump to a 195 lph. I set my timming at 14
btdc and my idle too is very lumpy at 800 but clears up at about 1100 rpm.
 

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Posted by slikstang (Member # 4652) on :
 
what is your vac... and did you drive the car before you installed the fuel pump..
thanks
kevin
 

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Posted by MISTA EE (Member # 4594) on :
 
don't know what my vac is, ill check and post later. the fuel pump was one of the first mods i did, long before i did the head, cam and intake upgrade.
 

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