Re: Troubles Setting Timming/Running
Attach vacuum gauge to manifold/full vacuum.
Ensure EGR valve is fully seated and in good repair - no leakage.
Ensure MAP sensor has good vacuum source and sensor itself works good and is getting 5VDC reference voltage.
Short Pins A & B together at ALDL connector.
Key on, eng off for about 10 seconds, key off.
Unplug IAC and bypass ignition, remove Pins A & B short.
Pull out welch plug at TBI curb idle screw and crank in about two-three turns to open throttle plates.
Set up timing light and ensure spark, crank engine to start.
Adjust timing as needed to keep vacuum high and engine to run smoothly.
Lower rpms once engine up to operating temperature to say 600 rpm, base rpm - non-ECM controlled, or whatever RPM is needed to keep engine running.
You may have to loosen and adjust TPS sensor to adjust smoothness, only after reaching oper temp base rpm.
Vacuum gauge should read above 16 inches for stock spec running.
Stop engine and reconnect EST and IAC and disconnect ECM power or battery to erase diagnostic codes, then reconnect battery/ECM power.
Turn ign key on for 10 seconds then off to set initial ECM idle.
Attempt to start, should run. ECM controlled idle should be around 750-850 rpm and ECM controlling ign timing.
Engine should run with some normalcy if you lifted TBI and swapped out 305 for a 383 and 383 camshaft has less than 220°@0.050" duration and wider than 112° LSA.
Otherwise, you'll need a reprogram.
Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - maybe this year, 2019 ...