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Hard Start Sometimes... 1990 K1500

I replaced all the sensor outlined above, however the throttle position sensor was replaced last (tested bad ie 3-3.5 or 4-4.5 volts... cant remember which one, see youtube for test proceedure). I should have tested it first if I had to do it all over again. That said it is running better, and...
- gensor
- Post #2
- Aug 15, 2017
- Forum: Engine Performance + Maintenance
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Best Air Fuel Mixture 1990 K1500

Thanks! However since I cleaned the TBI, I can now adjust the fuel pressure using ignition or needle nose pliers instead of spending $70 for the "86'-95' GM TBI Adjustable Fuel Regulator" from RV Morse Machine. As you can see in the image, I rotated the fuel regulator bowl so I can see the...
- gensor
- Post #4
- Jul 10, 2017
- Forum: Engine Performance + Maintenance
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Best Air Fuel Mixture 1990 K1500

Looking for recommendations on tuning the air fuel mixture on a 1990 K1500 5.7 for optimized efficiency between 40-80 mph on a stock motor. 1) Amazon "AEM (30-4110) UEGO Air/Fuel Ratio Gauge", using a wideband sensor 2) Tuner Pro with "OBD Diagnostics, Inc" 12 pin ALDL OBD1 GM Cable (USB)...
- gensor
- Thread
- Jul 10, 2017
- Replies: 5
- Forum: Engine Performance + Maintenance
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Hard Start Sometimes... 1990 K1500

1990 K1500 5.7 hard starting when not ran for 2+ hours. Initially the starter has to run for 4+ seconds, then after fast idle settles down (3+ seconds), the engine light comes on. If I start the engine again inside the 2+ hours, the engine light comes on again same as before... just easier...
- gensor
- Thread
- Jul 9, 2017
- Replies: 1
- Forum: Engine Performance + Maintenance