My latest project has been installing fuel injection on my 305 boat. I am using the 7427 ECM and was wondering what is needed as far as sensors to get the ECM to work correctly. I have all the basics hooked up.

TPS
IAC
MAP
Temp Sensor
Ignition Module
Fuel Pump Relay
Injectors

Not hooked up and has been disabled in the tune.

VSS
Transmission stuff
EGR
Purge

The boat runs like crap and is missing horribly and will hardly start. I am just wondering if there is something that needs to be hooked up in order for this particular ECM to run the engine. It is possible that the distributor and coil that I got out of the junkyard could be bad.

 

Did you start with the 4.3 CPI bin?

 

Yes I did.
I made all the changes for the injectors, cylinder volume etc...

I know the ECM is good because it works fine in my truck.

 

Just for grins, load up a 350 TBI .BIN file with the injector constant set correctly and see if it will start.

Make sure that you are using the value of ALL the injectors in the bank for the flow rate. That would be 4 x 19 or 76 lbs/hr, for the Edelbrock setup.

 

OK, I have the fuel pressure set to about 40 psi. Is that to high? I don't have the instructions for the Edelbrock setup anymore but it seems like they recommend about 35-38 psi.

 

Edelbrock states 42-45 in their instructions. 34-38 @ idle

http://www.edelbrock.com/automotive_.../3000/3502.pdf

Have you set the timing yet?

 

Well.....that is one of the problems I am having. I went to check timing and the mark on the balancer was not showing up. So I marked the other side of the balancer 180 degrees around and that mark showed up. Then I got mad and quit. Last night I pulled the dis. and had my wife crank it. I stuck my finger over the #1 plug hole and found the comp. stroke. I put the dis. back in double check all my plug wires 1-8-4-3-6-5-7-2. Hit the key and its still the same thing, hard to start and missing like crazy. To even get it to start I have to go WOT, its starts then I back the throttle off and feather it to keep it running. I know these dis. can go bad, have you ever heard of the coils going bad? Its a factory style TBI/TPI coil.

 

Ive had coils go out. They usually arc out internally between the primary and secondary coils. The car misses and burns out modules. Usually I replace the coil and module as a pair because of this. Check to make sure the base of teh distributer, hold down clamp, and area around the clamp where it constacts the intake are squeaky clean and free of corrosion as this is the ground path. Also make sure the wires and cap are in good shape. Anything that causes arcing will trash teh module over time and cause no starts and poor performance.