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Author
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Topic: PLUGS LOOK LEAN
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68dustin
CAFords OG
Member # 5388
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posted
 
 
i have a 68 mustang with a holley 4150 carb on it and a edlelbrock fuel pump. i took it out to the country and got on it and shut it down. when i pulled the plug out it looked really lean. i was wondering where should i start to fix the problem? im thinking hooking up a temp fuel pressure guage inside the car to see what psi its at. i have the stock fuel lines and im wondering if thats my problem? or could it be some adjustments in the carb?
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"As I lay rubber down the street, I pray for traction that I can keep, and if I do begin to slide, please dear God protect me and my ride!"
Posts: 3986 | From: neverland | Registered: Feb 2005
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92stangLX
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Member # 3252
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posted
You may want to post more info about your engine combo.
Could be a number of things like not getting enough fuel to the carb or the carb may be adjusted or jetted incorrectly.
I would start with fuel delivery and then look at the carb itself to see if it needs to be adjusted or re-jetted
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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68dustin
CAFords OG
Member # 5388
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posted
here is my setup
302 9:5:1
trick flow aluminum heads
mild cam
shorty headers
msd ignition
air gap intake
holley 4150 vac. secondarys
i believe my jets in the front are 82's (its been a while)
at crusing speeds my plugs look fine
edlebrock fuel pump (bigger than stock)
my psi at idle is about 6-7 psi
[ December 11, 2007, 04:45 PM: Message edited by: 68dustin ]
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"As I lay rubber down the street, I pray for traction that I can keep, and if I do begin to slide, please dear God protect me and my ride!"
Posts: 3986 | From: neverland | Registered: Feb 2005
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turbo50
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Member # 6700
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posted
quote:
Originally posted by 68dustin:
here is my setup
302
trick flow aluminum heads
mild cam
shorty headers
msd ignition
air gap intake
holley 4150 vac. secondarys
i believe my jets in the front are 82's (its been a while)
at crusing speeds my plugs look fine
edlebrock fuel pump (bigger than stock)
my psi at idle is about 6-7 psi
Those are huge primary jets.
I had a similar setup and ran 67s in the front and 72s in the rear but my compression was about 9 to one.
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Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
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Thirteen Twenty
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Member # 7961
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posted
quote:
Originally posted by 68dustin:
here is my setup
302
trick flow aluminum heads
mild cam
shorty headers
msd ignition
air gap intake
holley 4150 vac. secondarys
i believe my jets in the front are 82's (its been a while)
at crusing speeds my plugs look fine
edlebrock fuel pump (bigger than stock)
my psi at idle is about 6-7 psi
hard to give advise on this one without actually seeing the plugs myself but if you suspect a lean condition on a boosted engine I'd for damn sure get it fixed or checked out before driving it.
Posts: 647 | From: union city | Registered: Oct 2007
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68dustin
CAFords OG
Member # 5388
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posted
well the problem with the carb is its a vac secondary....there isnt any jets or power valve in the rear? its just a bowl and a plate inside.
my plugs were light tan around the base.. but pretty white towards the top.
In this carb there is only primary jets...i can purchace a aftermarket metering plate wich would put jets in the rear for 100 bucks..but i want that as a last resort.. thanks...
[ December 11, 2007, 04:31 PM: Message edited by: 68dustin ]
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"As I lay rubber down the street, I pray for traction that I can keep, and if I do begin to slide, please dear God protect me and my ride!"
Posts: 3986 | From: neverland | Registered: Feb 2005
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68dustin
CAFords OG
Member # 5388
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posted
ttt
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"As I lay rubber down the street, I pray for traction that I can keep, and if I do begin to slide, please dear God protect me and my ride!"
Posts: 3986 | From: neverland | Registered: Feb 2005
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