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Blazer's 85 Suburban "Twinkie"

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Distributer is sending RPM signal to computer. Coil is new, well put a in the box new on it no change.

The distributer is a one only thing, that they do not make anymore. Ebay has one for $150 not sure if it would even fix the issue, because it is in the computer maybe. Edelbrock tech line is no help with that.
Other people have had the same issue, from the feedback from Summit tech line.

So looks like I am going to get a different FI system.

UGGG
 
So opinions on how far the injectors go into the intake runners ?

Can I leave them in as hole fillers and run a FiTech ?
 
kgblazerfive said:
So opinions on how far the injectors go into the intake runners ?

Can I leave them in as hole fillers and run a FiTech ?
Click to expand...
Can you refresh our memory on what you have?
What size motor and what injection system?
Assuming stock gm?
 
They are on the 4th version of the proflo. The 1st Gen. The one I have was kind of just pieced together and thrown into the system to be 1 of the 1st ones out there.
 
Nothing is compatible with the newer versions of it. The computer controls the spark and I have no way of figuring out why it does not have spark. So it seems almost simpler and easier at this point to buy a newer fuel injection.
 
Except the computer controls the timing and it's run off a Hall sensor in the distributor so an HEI will not work. The owners manual actually gives you directions on how to convert an HEI to a Hall sensor distributor. Which is what I tried to do when I originally got the kit but it did not work. So my brother bought me the distributor for Christmas or my birthday or something like that.
And the distributor may be working fine but I don't know and I've gotten no spark.
 
Check with @folkenheath I'm pretty sure you could use your "hardware" and set it up with a Terminator ECU to run it. When I was having so much trouble with the PF4, he and I discussed this option.
 
I agree, if you already have a MPFI intake and injectors, I wouldn't go backwards. How much it costs will depend on what you currently have for a throttle body/sensors, and what distributor.
 
kgblazerfive said:
Except the computer controls the timing and it's run off a Hall sensor in the distributor so an HEI will not work. The owners manual actually gives you directions on how to convert an HEI to a Hall sensor distributor. Which is what I tried to do when I originally got the kit but it did not work. So my brother bought me the distributor for Christmas or my birthday or something like that.
And the distributor may be working fine but I don't know and I've gotten no spark.
Click to expand...

I meant just run an HEI, and not worry about the EFI controlling the timing.

If the rest of it works, and you are wanting to go the cheap route.

Martin
 
82355 said:
I meant just run an HEI, and not worry about the EFI controlling the timing.

If the rest of it works, and you are wanting to go the cheap route.

Martin
Click to expand...
Not sure it would run that way. It does not want to run if it doesn't get a signal from the coil
 
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Martin has a good point, if you can somehow split the RPM signal and let the EFI control the fuel and the HEI control the timing it might work, just not sequential. Does that EFI have batch fire capability?

I'm assuming its using the pickup from the distributor, and firing the coil, if its getting a signal from the coil then the coil is already fired.
 
The coil isn't firing. Not sure If it is getting a signal from the distributor. The computer is getting a signal from the distributor because it's telling the RPMs but it's not firing the coil. And I don't know why nor do I have any way to check the computer to see what it's doing.
 

Edelbrock Pro Flow Gen 1 Information​

05-16-2019, 01:54 PM

My father in law pulled out a 1968 Pontiac lemans from the weeds in someones yard. The hood would not open so we did not know even what engine it had in it. After we got it open we found out that it has a small block chevy 400 engine with a edelbrock pro flow 3500 in it. Unfortunately there is not a lot of information/documentation on this system. I called edelbrock support and they told me to reach out to a tuner who may have worked with this system if I want any support. They dont have anyone at edlebrock anymore who has worked with this system. So after a lot of reading and research I decided to post what I have learned to help anyone out who might have this system. I am no EFI expert but I have converted my 1972 camaro from a carburetor to EFI using a ECU from a 1986-89 Camaro or Firebird commonly referred to as a '165' ECU. I am running custom code that guys in Australia made called OSE12P. The '165' ECU has a some similarities to the edlebrock 3500 that I will be important when I get into it later. The first place to start is do you have a Gen 1 Pro-Flo or a Gen 2 Pro Flow. The Pro-Flo Gen 1 has a silver ECU and the Gen 2 has a red ECU. I have posted pictures below so you can see the difference. Now to determine specifically which of the three gen 1 pro flos that you have specifically 3500, 3503, 3507. Look at the the pictures of each of the systems in the manual below. Specifically look at the position of the coolant temp sensors next to your thermostat housing. All three systems have the coolant temp sensors in different locations. The 3500 also has a specific fuel pressure regulator. All three systems are sequential injection meaning the fire when the intake valve is open on that cylinder. Unlike GM injection systems from the 80s which are batch fire the gen 1 pro flo uses a TFI system that ford used during the 80s to make all 8 injectors fire sequentially. When the system was new you would install a metal reluctor ring under your distributors rotor and that passes through a hall effect sensor. There was no room for the ignition module that is normally in the distributor so they have a box they call a "ignition amplifier". The ignition amplifier is just a box that holds the 7 pin GM ignition module from the 80s. So if it fails you just drill out the rivits and get a new one. The pro flo gen 1 uses a narrow band o2 sensor. This sensor is more like a switch and just goes between rich/lean but the ECU does not know how much. There is no air fuel ratio on the hand held just an LED that changes colors green rich/red lean. If you plan to use this system I would suggest getting a separate wideband sensor with a gauge or a wideband with narrowband emulator like the spartan 2 from 14point7 to get your tune right. Starting with the Pro flo 2 system you could load different tunes onto the ECU and make tuning changes with a laptop. The Pro Flo 2 system has two serial connectors one for the handheld and one for a computer for custom tuning using the Power to Win software on Edelbrock's legacy support page. The Edelbrock Pro Flo Gen 1 only has one serial connector and you cannot use Edelbrock's Power to Win software to tune this ECU. The only way you can use a computer to tune the Gen 1 Edelbrock Pro Flo Gen 1 is using the Tuner Cat software. I have not done this so I am not sure if you tune via the serial cable or if you have to pull the chip from the ECU. Contacting Tuner Cat for the details would be the way to go here. There is a sticky thread for the 'chips' that the pro flo gen 1 could have came with. Unfortunately it does not tell you how to verify what chip you have. You have to physically open your ECU and there will be a chip with a sticker that will tell you what configuration you have saved to the chip. I put a picture below so you can see what I am referring too. You dont want to buy a Pro Flo Gen 1 ECU with a configuration for a radical cam when you just have a stock cam for example. The chip that is installed is a 27C256 28 pin chip. This type of chip is found commonly in the aftermarket and in some factory ECU. The '165' ECU that I am using from a 86-89 camaro uses a 28 pin aftermarket chip 27SF512. Theoretically if Edelbrock was nice and released the .bins for all of the chips for this ECU that could have came with you could buy an aftermarket chip and write any configuration to your chip for the cam of your choice. To reprogram this style of chip you would have to use a programmer/eraser like the Burn 2 programmer from Moates.net I doubt that will ever happen and I doubt you could get a different chip if you needed it from edelbrock at this point. Hopefully this information will help someone someday to identify what system they have and and what it is capable of.


Pro Flo Gen 1 Specs Part Number 3500, 3503, 3507
ECU Chip: 27C256 28-Pin Chip
Fuel Pressure: 45-50 PSI Running/High 30's Low 40s PSI w/Vacuum applied to fuel pressure regulator
TPS Setting: Use handheld to set the TPS to 13 degrees.
Ignition: 7 + 1 Ford TFI set to 10 degrees before top dead center at 1500RPM
Fuel Injection Method: Sequential Injection
Injector Impedance: Only use high impedance injectors low impedance could damage the ECU
Injector Size Part Number 3500: 28lb/hr 50PSI // Edelbrock #3598
Injector Size Part Number 3503 & 3507: 29lb/hr 42-45PSI // Edelbrock #3853
O2 Sensor Type: Heated Narrowband O2
Ignition Amplifier: Edelbrock #3518 (This is just a fancy box containing a GM 7 pin ignition module in a large cap HEI distributor that you would find in a 86 Camaro)
Fuel Pump Relay: Edelbrock #3586
MAP Sensor: GM 16006835
Manifold Air Temp Sensor: GM 25036751
Coolant Temp Sensor: GM 25036979
TPS Sensor: Edelbrock #3590 (No Longer Produced https://forums.edelbrock.com/forum/p...lability/page4)
O2 Sensor: Edelbrock #3591
Fuel Pressure Regulator 3500 Only: Edelbrock #3597 (No Longer Produced use a fuel pressure regulator from a 1986-89 camaro/firebird)
Hall Effect Sensor: Edelbrock #3517 (No Longer Produced https://forums.edelbrock.com/forum/p...-chevy-350-383)
Idle Air Control Valve: Ford FOAE-9F715 B1A ( 1990 Ford Bronco 5.8L/351 Winsor)


Manual For Pro Flo Gen 1 Part Numbers 3500, 3503, 3507: https://static.summitracing.com/glob...oefisystem.pdf
Link to Tuner Cat: http://www.tunercat.com/tnr_desc/ecm_sup.html#edelbrock
Tuner Cat Edelbrock Pro Flo Gen 1 Tuning Capabilities: http://www.tunercat.com/pdfs/ECM_3500.pdf
Pro Flo Gen 1 Chip Numbers: https://forums.edelbrock.com/forum/p...o-chip-numbers
27SF512 Aftermarket 28 Pin Rewriteable Chip: http://www.moates.net/c2-sst-27sf512....html?cPath=26
Aftermarket Chip Writer/Eraser: http://www.moates.net/burn2-chip-pro....html?cPath=64
Detailed Info Hall Effect Sensor: https://forums.edelbrock.com/forum/p...some-questions
Basic Info About Hall Effect Sensor: https://forums.edelbrock.com/forum/p...4177#post24177
 
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