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Retro's 1989 GMC Sierra C1500 Sportside Indy clone
- Thread starter RetroC10Sport
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- Joined
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1227747.
Jims86
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Ok, that that bLM is better, 123 is usually a good pre Cl BLM.
In a nutshell, the Block Learn Multiplier (BLM) is the long term fuel adjustment that the ECM "learns" to keep the air/fuel ratio within acceptable parameters. The Integrator is the same idea, only for short term adjustments. Basically, these two strategies are used to make adjustments and adaptations to the ever changing loads, atmospheric conditions, and fuel quality to keep the car's air/fuel ratio correct for driveability and emissions.
Also, keep in mind that when we say Long Term or Short Term, we are talking in computer time, not human time. In our ECM the Long Term fuel adjustment (BLM) happens about twice per second, while the Short Term fuel adjustment (INT) happens about 20 times per second
The same thing was happening in my Burb until i just got fed up and tuned it out. These rich running systems, when everything hardware wise is perfect, is still a mystery, unless its the injector drivers going to ****, that I posted in another thread. I have not been able to try that capacitor install on mine.
In a nutshell, the Block Learn Multiplier (BLM) is the long term fuel adjustment that the ECM "learns" to keep the air/fuel ratio within acceptable parameters. The Integrator is the same idea, only for short term adjustments. Basically, these two strategies are used to make adjustments and adaptations to the ever changing loads, atmospheric conditions, and fuel quality to keep the car's air/fuel ratio correct for driveability and emissions.
Also, keep in mind that when we say Long Term or Short Term, we are talking in computer time, not human time. In our ECM the Long Term fuel adjustment (BLM) happens about twice per second, while the Short Term fuel adjustment (INT) happens about 20 times per second
The same thing was happening in my Burb until i just got fed up and tuned it out. These rich running systems, when everything hardware wise is perfect, is still a mystery, unless its the injector drivers going to ****, that I posted in another thread. I have not been able to try that capacitor install on mine.
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Gotcha.
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I should also mention that it has a new fuel pump and PSI is 11-12 at idle.
Jims86
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Yeah, thats where they normally operate. 9-13 is spec.
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So I changed out an exhaust manifold with a crack between the 2 and 4 cylinders and a blown gasket. Seems to run slightly better, but we'll see tomorrow when I take it out.
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Sierra now sports 15x8 squarebody rallies with nice tires I picked up for $175 from a hopefully future member with a 2WD 1981 Blazer.
foamypirate
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Looks great!
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Diggin it!
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Jims86
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I had an idea one time of getting a LWB GMT400 and 2 step beds...1 in good shape, one rearended. Extend the good one, and make a longstep 400.
Would really confuse the **** outta folks, and look pretty cool.
Would really confuse the **** outta folks, and look pretty cool.
