vehicle starts and stalls

Asked by Guru96HHNV Oct 23, 2022 at 11:52 PM about the 2001 Chevrolet Silverado 3500 Crew Cab LB DRW RWD

Question type: Maintenance & Repair

Why does my truck start & stall repeatedly?
Vehicle: 1993 Chevrolet C3500 454/7.4 OEM
Fuel: OEM TBI, Fuel Pressure 10 psi steady gauge, clean spray
Ignition: Distributor MSD 8336 new, ICM in Distributor tested OK, but
replaced anyway no change in start stall.
Coil MSD 8226 new, New Plug Wires: 8.5 silicone
Used Spark Indicator on coil, distributor output, & on spark plugs all OK.
Timing: Verified Cylinder 1 TDC with camera, verified Crank Timing mark on
Dampener, verified Distributor on Cylinder 1 set at 4 degrees TDC with ECU
disconnected.
No ODB Error Codes, No Blown Fuses, Verified all Grounds & Battery Health

1 Answer

Guru96HHNV answered about a year ago

I am the poster of this question, In reading found that the IAC (Intake Air Control) was the problem. I disconnected the IAC plug, cranked the engine & it was slow to start then smoothed out. I also found the CTS (Coolant Temp Sensor) was shorted so the ECU (Car Computer) had no temp data to trigger the IAC operation.

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