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Old 11-10-2005, 07:24 PM
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adjusting the timing on fuel injection

This is for anyone that has a laptop tuneable computer for thier engine. I have recently converted a carbed sbc 383 over to fuel injection. When I reinstalled the distributor, I got the postion correct but I was never able to carnk the motor over because I didn't know how to calibrate the computer.

My problem is, every time I shut the motor off and try and restart it within a few minutes, It is like the starter has a hard time cranking the engine over. The motor does fire but the starter like cranks for a second or two then stops then cranks for another second or two then stops again. I have been told that this is because the timing is high. Would that be the intial timing they are talking about?

Not knowing what the timing was at, the car was brought to a speed shop to have them calibrate and get the motor running.

My real question is, Would I be able to retard the intial timing by turning the distributor without having to worry about adjusting the computer for the lowered timing.

Any information would be greatly appreciated

Thanks

Dan

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Old 11-10-2005, 08:43 PM
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Yes, sounds like too much initial ignition timing. If you find TDC no. 1 cylinder and set your distributor so it fires at that position. The computer will take care of the running advance.
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Old 11-10-2005, 09:03 PM
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if you had a cam and a crank sensor timing is completely controlled by pcm. Some engines have a dist and cam and crank sensors but the dist is fixed and is adjustable only to synchronize the sensors very little movement.
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Old 11-10-2005, 11:03 PM
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No you can not reset the distributor, unless it's not set correctly per the EFI install instructions. The setpoint on the EFI not only controls your spark but it also signals the injectors. All advance and retard needs to be done through the computer screen.

You need to get a laptop, load the software,sync the computer to the ECM and view the timing map at startup. What is the issue your having getting your computer going?


It will take about .05 seconds to change that cell at 98kpa and 0 RPM to 12-15 degrees once you have your computer setup. You also need to verify that your config setup screen is set with the correct advance offset for your ignition system. The techline for the system you purchased from will be able to walk you through this easy process. If it's a FAST or Edelbrock I can certainly help you via email as well. I also have some experience with the Holley.
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