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84 L83 Crossfire Carb conversion

 
Phosgene
I love my Chevy Chevette!
Posts: 3
Joined: 02/14
Posted: 02/11/14 03:08 PM

Hello, i have an 84 C4 that i plan to convert to a carb, mostly because i am really sick of dealing with the crossfire injection system (CFI) problems such as it running rich, idling way high, occasionall stalling and an overall lack of efficiency.

I have a budget of $750 and this is the parts list i have compiled so far

http://www.summitracing.com/parts/spe-2429

http://www.summitracing.com/parts/sum-g1414

http://www.summitracing.com/parts/sum-g1423

http://www.summitracing.com/parts/sum-m08750vs

http://www.amazon.com/Rislone-4405-Yellow-Supplement-Concentrate/dp/B0075559UY

http://www.amazon.com/1958-86-Chevy-Small-Valve-Covers/dp/B0032CXGX6

http://www.amazon.com/Holley-12-803BP-Fuel-Pressure-Regulator/dp/B000CMDV84

http://www.amazon.com/Edelbrock-2701-Performer-Intake-Manifold/dp/B00063046Q

http://www.amazon.com/Mr-Gasket-9810-Chrome-Breather/dp/B000BWCGA4 x3

http://www.amazon.com/Spectre-Performance-Chrome-Fuel-Fitting/dp/B00062ZDAE

http://www.amazon.com/Digital-Color-Analog-Ratio-Monitor/dp/B008P6DOIG

http://www.amazon.com/Thermoid-24088-Fuel-Line-Hose/dp/B000KKHNZU

http://www.amazon.com/Bando-6PK2170-Quality-Serpentine-Belt/dp/B000CB0KJS

http://www.amazon.com/Auto-Meter-20805-Gauge-Single/dp/B000CMH9XW

http://www.skipwhiteperformance.com/detail.aspx?Item=6500-R

The summit carb and related parts are so i have a carb of course, the brackets are for the transmission TV cable (700R4) and the studs hold the carb down

The oil additive is because i have a flat tappet cam car, and new oil does not have ZDDP (zinc additive) in it which causes cam lobe flattening and piston damage if you use oil without it in older engines

The valvecovers are because one of mine has a crack in it

The fuel pressure regulator is because i am converting a car with an electric fuel pump to a carburetor and i need to turn the pressure down

The intake manifold goes below the carb

The breather is for the valve covers

The fuel fittings go to the Fuel Pressure regulator since i dont think it comes with any

The AFR guage i plan to use to help tune the carb, and because since my car already has O2 sensors i might as well use them since the ECU wont need them any more

I think i will need some fuel line

I will need a shorter serpentine belt since i deleted the AIR pump, already measured it

The guage mount is so i have somewhere to mount the AFR guage

and finally, the distributor is because the current computer controlled HEI distributor will likely not work and i will need a vacuum advance dist

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My concerns are that my other guages might not work with the ECU not getting an engine running signal, i know the tach and speedo will work since they read from the distributor, bellhousing, and VSS

I know the fuel meter will work since it still functions with the engine off, as does the voltage meter

I am unsure if the oil press, oil temp, and coolant temp guages will still function, and if anybody knows and could tell me it would be helpful.

I plan to leave the ECU in and let it handle various functions such as the power antenna, climate control, light dimmers and hopefully guages.

I have some spare valvecover gaskets i plan to use, along with extra hose clamps, but i will need to buy a air filter once i measure how much clearance i have

If there is anything on my list that can be found cheaper and would still work, please tell me, also i prefer to order from amazon since summit charges me a 7% tax in my state.  

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wayne712222
My first time was in a Chevy
Posts: 143
Joined: 10/13
Posted: 02/11/14 06:25 PM

ahh.. good you are here..

more to come in a little while.. i have some stuff going on other forums.. and you need a decent answer...

i will have some info for you later tonight..

welcome...

type in crossfire into the forum search window..

i have covered a lot of issues.. already..  

Post Reply
wayne712222
My first time was in a Chevy
Posts: 143
Joined: 10/13
Posted: 02/11/14 08:22 PM

again.. sorry.. i cover a bunch of forums..

start with this crossfire to carb forum thread that covers several years of posts...


http://forums.corvettefever.com/70/6462101/c4-corvettes/crossfire-to-carb/


i would like to spend a little time online helping you do a little diagnosis. as C4 crossfires are very simple fuel injection systems.. but they have to be perfect to operate properly..

start reading as there are some air cleaner to hood issues if you select too tall an intake manifold..  

Post Reply
wayne712222
My first time was in a Chevy
Posts: 143
Joined: 10/13
Posted: 02/11/14 08:45 PM

first off.. stop at an az store and pickup this from duralast or wells.. an SU102 .. it comes with sensor and pigtail.. it screws into the FRONT of the intake manifold behind the smog pump..

Su102

you can see the engine coolant temp sensor location behind the smog pump in this image..

0D9b656b 1Bbc 4Caf 97Ba 8842Ec8dcc2b Zps000c6fc8

which port is your MAP sensor hooked to??? there are 3 ports on teh back of the throttle bodies.. the center port is usually blocked off as its only used to sync the throttle lever adjustments..

84Crosfirevacuumcal

there are a whole bunch of grounds to check...

and check means.. actually taking the fastener out and wire brushing both sides of each ring terminal. then reinstalling them with cleaned fasteners..

82 84Crossfiregroundconnection

Scandatagm

more to come..  

Post Reply
wayne712222
My first time was in a Chevy
Posts: 143
Joined: 10/13
Posted: 02/11/14 09:48 PM

i liked most of your parts selection..

one thing.. you will need a different fuel pressure regulator.. it MUST be a RETURN TYPE fuel pressure regulator.. or you need to switch the Intank pump to an airtex
Part Number: E3903
1987 Chevrolet Camaro 5.0L Carburetor OHV 8cyl
Item Grade: OEM Standard Part
Maximum Free Flow Rate (gph): 35
Maximum Pressure Range (psi): 5
Minimum Free Flow Rate (gph): 20
Minimum Pressure Range (psi): 3
Outlet Attachment: Outlet-HoseConnection
Outlet Count: 1
Outlet Size: Outlet - 3/8

this will supply your carb with enough fuel without the fuel pressure regulator.. it will take you less than an hour right thru the rear deck to swap the pump on the sending unit.. please pick up a Delco G1 gasket.. it fits the corvette fuel tank...

you will need a strainer for it also.. or the pump will be ruined..

i would also find some super magnets and throw them in either end of the fuel tank.. yes.. i know its rubber lined.. it still needs them sediment comes in from the gas stations.. clogs the fuel filters

i am glad you selected that carb.. if you decide to do so.. the idle feed restrictions are easy to change in that model..  

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wayne712222
My first time was in a Chevy
Posts: 143
Joined: 10/13
Posted: 02/11/14 09:58 PM

oh... you will want to look thru the classified in your area. if you don't have a scan tool to access the live data stream to figure out whats really going on..

http://forums.corvettefever.com/70/8585187/c4-corvettes/which-used-scan-tools-for-82-to-94-corvettes-with/

lets see what else...

there are slight mods to the fuel pump circuit.. as you won't have a computer operating the fuel pump relay.. please don't go probing the relay connectors with a test light.. i can explain what needs to be done.. the 2 or 3 wire oil pressure switch under the distributor also powers the fuel pump power circuit when the oil pressure comes up.  

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Phosgene
I love my Chevy Chevette!
Posts: 3
Joined: 02/14
Posted: 02/14/14 10:44 PM

the fuel pressure regulator http://www.amazon.com/Holley-12-803BP-Fuel-Pressure-Regulator/dp/B000CMDV84 is described as "Fits systems with return fuel line" and the better images of the same one on summit http://www.amazon.com/Holley-12-803BP-Fuel-Pressure-Regulator/dp/B000CMDV84 show it having a third port  

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Phosgene
I love my Chevy Chevette!
Posts: 3
Joined: 02/14
Posted: 02/14/14 10:46 PM

the fuel pressure regulator http://www.amazon.com/Holley-12-803BP-Fuel-Pressure-Regulator/dp/B000CMDV84 is described as "Fits systems with return fuel line" and the better images of the same one on summit http://www.amazon.com/Holley-12-803BP-Fuel-Pressure-Regulator/dp/B000CMDV84 show it having a third port  

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wayne712222
My first time was in a Chevy
Posts: 143
Joined: 10/13
Posted: 02/15/14 01:25 AM

Ok thats cool then.. it did not look like a return type..  

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