Recent content by camaro354

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Another TBI running rich

If your not strong on the electrical side of things with reference to the wiring diagram I linked to above. The pickup coil inside the distributor along with the sprocket are responsible for generating the tach reference signal which is fed to the ignition module and then from the module it is...
- camaro354
- Post #78
- Jan 26, 2020
- Forum: Engine Performance + Maintenance
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Another TBI running rich

Given the age of the vehicle I have seen wires breakdown in various ways that can be intermittent despite expected logic. Corrosion, carbon buildup, increased wire resistance or actual breaks in the copper of a wire that still conduct part of the time... yes it is a relatively short period of...
- camaro354
- Post #77
- Jan 26, 2020
- Forum: Engine Performance + Maintenance
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Another TBI running rich

https://easyautodiagnostics.com/gm/4.3L-5.0L-5.7L/ignition-system-wiring-diagram-1 Your problem appears to be an issues with the tach signal being reported to the ecm. You will want to inspect the wire harnesses and conections. maybe you have a broken wire or connection that as it gets warmer...
- camaro354
- Post #75
- Jan 26, 2020
- Forum: Engine Performance + Maintenance
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Another TBI running rich

Can you confirm if the engine is surging from idle up to 2500 rpm back and forth like it shows in the logs, or is the the engine rpm sticking to idle speeds more or less?
- camaro354
- Post #73
- Jan 26, 2020
- Forum: Engine Performance + Maintenance
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Another TBI running rich

If you are able to log from cold startup past the bog that would be pretty useful. As for lowering the pressure you would want to modify the stock regulator or get one of the aftermarket pieces (jet, summit, jegs all have one) for the stock regulator. These systems did not like the aeromotive...
- camaro354
- Post #70
- Jan 26, 2020
- Forum: Engine Performance + Maintenance
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Another TBI running rich

First off do you have the stock tbi intake manifold on the vehicle? These trucks have no air temp sensor so a heated intake and stock 195 tstat is a must, as that is what the computer is expecting to see. Data logs look okay, did the truck act up within the log you posted? I did see your BPWs...
- camaro354
- Post #68
- Jan 26, 2020
- Forum: Engine Performance + Maintenance