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5.0l v8 surging and stalling at low speed 

 

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 Post subject: 5.0l v8 surging and stalling at low speed
Posted: Sun Jan 22, 2006 4:27 pm 
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changed leads spark plugs cleaned out fuel system and injectors checked
fuel pressure and was at 80 psi when i turned the ingnition on

is that about right or could my return valve be blocked or fuel pressure to high?
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Posted: Sun Jan 22, 2006 5:07 pm 
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From memory 30-45 psi was around the acceptable "Engine Running" fuel pressure for the 5.0 maybe its bit high.
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Posted: Sun Jan 22, 2006 10:26 pm 
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Yep way to high, but I wouldn't have thought it would cause surging or stalling, but then again I have never seen 80psi, I wouldn't have thought it could get that high.

 

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Posted: Sun Jan 22, 2006 11:38 pm 
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Yeah as said, 80psi is way too high, wouldnt think the factory fuel pump would be able to push that much pressure. I would check the pressure readings again to make sure but if for some reason (only obvious reason I can think of is a stuffed regulator) it is running at 80psi then that would make the engine run rich which will cause bad drivability, stalling, surging etc.
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Posted: Mon Jan 23, 2006 12:16 am 
Getting Side Ways
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Std fuel presure on V8s is 38 Lb..Just raising fuel presure 2 or 3 lb makes alot of difference at idle...

 

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Posted: Mon Jan 23, 2006 1:03 am 
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i will be geting the fuel pump and reg looked at on tuesday will let you guys no how i goes
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Posted: Mon Jan 23, 2006 8:53 pm 
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EBXR8380 wrote:
Std fuel presure on V8s is 38 Lb.
I thought it was 32lb?
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Posted: Mon Jan 23, 2006 8:57 pm 
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With the vac line on it will be around 32-34psi but with the vac off it should be around 38psi.
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Posted: Wed Jan 25, 2006 10:35 am 
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i had the EEC looked at today 1 error code came up map/bap sensor
fault .on the eb should there be vacuum hose or not?
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