EFI to Carbed

Topic: EFI to Carbed (Read 3718 times) previous topic - next topic

Reply #15 – June 11, 2006, 12:07:40 AM

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i have a few questions

you said you have pushrod problems?

ok first what engine block are you useing? ie roller or non roller?

two what cam? ie part number and is it a 302 cam or a 351W/HO302 cam

three what ecm are you useing mass air or speed density?

now other things like stock heads or aftermarket heads?

its the stock block with rollers. i got the cam 2 years ago its a comp cam and thats all i remember its speed density, with stock heads

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You say its a Speed Densety EEC, they will NOT work with much more than the stock HO cam... Low vaccum will cause a rich, surging idle condition... Do you have any idea how much vaccum the engine is making? A SD EEC won't idle without surging on less than approx 16" of manifold vac... If its borderline you may be able to increase the idle to 800/900 rpm to bring the vac up a bit...

i was wondering about this i dont even know how to check to see how much vacuum im getting. tho it runs rich all the time. so if im not getting enough vac would it still run rich when im at higher rpms like 2k? its a VM1 computer you said that it may need the ground ran to the 46 pin i believe tho i did that and didnt do anything.

i just found my dads code thing today so im going to get the codes monday for sure.

hijack this i dont care maybe it will help me out in the end

EFI to Carbed

Reply #16 – June 11, 2006, 12:20:15 PM

In a SD system the MAP sensor is "KING", and rules with a iron fist...

Translated the SD system relies on input to the EEC from the MAP sensor for fuel richness. With low vac, basically the MAP is telling the EEC the engine is in acceleration mode so it richens the mixture...

If you don't have a vaccum gage, go to the auto parts store and get one(they ain't expendive, and will include directions). Basically your just ' in the wind till you know how much manifold vaccum the engine has... Usually it's not noticable at higher RPMs but again unless you know for sure you're shootin in the dark..

If the vac is over 17" idling you have other problems... My Small Trick Flow cam idles at approx 11" vac, no way I could use a SD system.

EFI to Carbed

Reply #17 – June 12, 2006, 09:04:42 AM

ok done at 600 rpms its 6 idling...lol at 1200 idling its 11 at 2000 (my foot is on the gas) its 16 does this sound right i couldnt run it at 600 rpms for long so it was a lil cooler then the other ones becuase everytime i do i just foul out the spark plugs.

and i tested off the upper manifold. tho i tryed off the lower one too and it ran about the same 6-7 at 600 didnt do it at the other rpms

EFI to Carbed

Reply #18 – June 12, 2006, 10:52:20 AM

With those vac readings you either have a hellva vac leak, or that is one rumpty rump cam... Does it have a fairly rough(lopey)idle??? Any idea of the specs @ .050" lift???

At the moment looks like you either need to go to a mass air setup or get that carb you been thinking about... The cost will probably be similar for both. Carb, intake , dist and fuel system mods. or a EEC, MAF(with intake air tube), and a little rewiring...

EFI to Carbed

Reply #19 – June 12, 2006, 02:05:22 PM

or, fix the leak or check your to make sure your cam isn't degree'd wrong or that your timing isn't comepletely borked.

something is deffinately not right. also, any mechanic that didn't check the vacum when it sounded like that is not one I would go to again.

EFI to Carbed

Reply #20 – June 12, 2006, 04:14:06 PM

yes it has a lopey idle and i dont think the lift was .50 but it may have been close i dont remember like i said

the mechanic just listened to it and didnt really look at it at all or care to he just told me the timing was off... and yea i dont think ill be asking him for help for a while (only problem he is my girls dad so yea....)

ok now 2 problems im having with going carbed is can i make my fuel pump work and how and also i understand i have to hook up the carb different for aod but how shiznitty is that going to be.

now if i go maf will it work becuase i thought even that as limits.

this weekend ill see if i can find any vac leaks i hope i can and clear this up.

EFI to Carbed

Reply #21 – June 12, 2006, 05:07:24 PM

The actual lift ain't the real important part... The duration @.050 lift is whats important as is the lobe seperation...

Unless its a really wild cam, a mass air setup should run it with minimal problems... Driveability wise mine ain't perfect, but it's taken me to Carlisle Five times(700-900 mile total trips). ... Also went to Cat Jam in '02 and almost on to Indiana for 1500+mi trip... On the highway it gets anywhere from 22-26mpg, depending on how hard I run it..

EFI to Carbed

Reply #22 – June 12, 2006, 05:49:55 PM

this is the parts im looking at does this look right also i really appreciate all the help


6A Ignition Control
Part Number # 121-6200
   $148.99    $148.99

High Performance HEI Distributor
# Ford 260, 289, 302 & 305 5.0 Engines1962-83
# Red Cap

Part Number # 778-66969R
   $186.99    $186.99

600 cfm Electric Choke; Remanufactured 350-1400
Part Number # 350-9900
   $229.99    $229.99

# Performer 289 Intake Manifold SB-Ford 260-289-302ci
# 4-bbl Square-Bore Carb (non-EGR)
# Idle-5500 rpm
50-state legal
Part Number # 350-2121
   $142.99    $142.99

Ford 302 Throttle Cable Plate Kit
Part Number # 350-1490
   $12.99    $12.99
   Update

   Subtotal: $721.95

this is just to see what i need

EFI to Carbed

Reply #23 – June 12, 2006, 07:17:20 PM

You're going to have to either change fuel pumps or put a hell of a pressure regulator on it as well. the fuel pump in our cars runs somewheres around 40 PSI or higher if I remember right. and carbs need like 4 to 9 PSI if I remember correctly. Also you may have to do something about the ends of the fuel lines to get them to connect to the carb. not sure what carb youre using if its an edelbrock they may have some kind of thing for that already same as with holley.
As for the AOD tranny all you should need is a spot to hook it to on the carb if you have a cable you'll need a cable bracket to hold the end and possibly a ball end on the trottle plate of the carb. if you dont have a cable just get a rod off another AOD and hook it to the carb the same way it hooks to the TB of a CFI setup.
basically you have most of what you need but with your current fuel system you're going to run a hell of a lot richer then what you already are.

EFI to Carbed

Reply #24 – June 14, 2006, 08:57:55 AM

well i think i found my vaccum leak my pcv valve going to my valve covers is leaking when i push on it at 900 rpms it goes from 9 psi to 13-14 psi vacuum and i can hear it just sucking air so im going to fix that this weekend with that order one of these but i have no clue what one will be right for my car

http://www.mass-air.com/Products.htm#Car%20Mass-Air%20Kits

Part Number CK-8611-x, basic kit with 55mm 19 lb stock sensor
Part Number CK-8612-x, basic kit with 73mm C & L Meter
Part Number CK-8613-x, basic kit with 76mm C & L Meter
Part Number CK-8614-x, basic kit with 80mm C & L Meter

i was thinking the 73mm would be right am i right?
are this a good kit i figured that if its linked from cool cats it is but just making sure
thanks again for everything