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Old 05-01-2010, 11:21 AM
unstable's Avatar
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Tired BBC stumbles...ECU, TBI...HEI?

89 Chevy 454...TBI, ECU controls the spark...recently replaced plugs, wires, cap, rotor etc.

If I really jump on the gas, she stumbles but works her way past it. It could be a fuel problem, I've heard the fuel pumps gradually produce less PSI over time...plus the filter looks like it has about 100,000 miles on it. I'm in the process of dropping the tank to replace the lines and the filter right now.

The second thing I was thinking was timing...but the ECU controls the advance, and I'm not sure how responsive the whole TBI/ECU crap is supposed to be. I've never been in a fuel injected car that I felt responded as well as a carburated vehicle. In any case...

What would happen if I just pulled this distributor out and replaced it with an HEI right now? Does anyone know if there's any kind of handshake between the ignition and the fuel map on these guys?

In the very near future this entire motor is coming out and it's getting a fresh motor, carb and HEI anyways...but it's a nice day outside today and I figured I would try to wrench, tune her and have a little fun while I wait for the new motor.

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Old 05-01-2010, 12:55 PM
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Hi,
I think it would run better with a new fuel filter.
Rich

basically all you have to do is take the stock control module off your stock dist. and the 2 prongs that come off the module go to the ignition pickup coil on the distributor, attach wires to the prongs, and splice them into the corresponding wires on the new HEI. the outside prong goes to the white pickup wire, and the inside one to the green. the 4 wire connector still has to go to the oem harness, and the 2 wire harness that has a pink and white wire that went to the remote coil gets power to the pink wire and ground to the white wire, then simply install the distributor and put the ignition power and tach wires on the cap and your set.
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Old 05-01-2010, 01:15 PM
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thanks for the information Mr. Stewart.

I guess what I was wondering was...Being that there is a relationship between the throttle position sensor, how much fuel is being dumped into the motor and the ECU controlling the advance...

IF I simply pulled that ECU-distributor out and replaced it with an HEI one, would that allow me to adjust my own advance without any other ill effects on the fuel map? Does that make sense?

Like you can't really replace the TBI without replacing the distributor because of the relationship that the ECU manages...

I plan to do the fuel filter but I have to drop the tank because the lines are rotted out...might be losing fuel pressure there too.
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