Sometimes you have to hit the road to find out what the cause of an issue is. Follow along with this Real Fix to see how a stalling complaint was resolved on this Cadillac Escalade.
Vehicle
2008 Cadillac Escalade 6.2
Title
Engine Stalls, Replaced Fuel Pump
Complaint
The customer states the engine stalls.
Cause
Confirmed the customer’s complaint and found the engine stalled. Performed a visual inspection of the vacuum hoses and found no obvious faults. When the engine stalled, connected a spark tester to a spark plug wire, cranked the engine and found spark was present. Connected a fuel pressure gauge to the fuel pressure test port, ran the engine and found the measured fuel pressure dropped below specifications when the engine stalled. Visually inspected the fuel pump wiring harness and found no obvious signs of damage. Backprobed the fuel pump voltage feed and ground circuits at the fuel pump connector using long leads that reached the passenger compartment and connected the leads to a multi-meter. Performed a road test, monitored the multi-meter and found voltage and ground were present when the fuel pressure dropped. Disconnected the fuel pump connector, visually inspected the connector and terminals and found no obvious signs of damage. These test results verified the fuel pump was faulty.
Correction
Replaced the fuel pump and verified the vehicle operated properly. The customer’s concern did not return.