Cadillac Repair: 2003 Cadillac CTS wont start, 2003 cadillac cts, oil pressure switch

Question
QUESTION: First it won't start at all; I changed the fuel pump & it started but then after driving it for 10-15 minutes & stopped somewhere, it won't start again.  It seems like it won't start at all once the engine is hot.

ANSWER: When it does not start what are you lacking ?. Ignition to the spark plugs or fuel to the engine. ?.

---------- FOLLOW-UP ----------

QUESTION: Hi!  It's the fuel to the engine that made the car won't start.  I had to spray starter fluid in the intake to make the engine start.

ANSWER: Does the engine run now or do you still have no fuel getting to the engine ?.

---------- FOLLOW-UP ----------

QUESTION: The engine runs once I put the starter fluid in the intake.

Answer
Does the engine continue to run or do you have to make it run using starting fluid ?.

Perform this test:

Fuel pump test:

1. Get yourself a helper.

2. remove the gas cap.

3. have one person listen in the gas tank at the gas cap opening.

4. have the other person turn the ignition switch to the ON position ONLY so as the dash lights come on. Do NOT attempt to start the engine.

5. As soon as the ignition key is turned to the ON position, The person at the gas tank should hear the fuel pump run for TWO SECONDS and then it should STOP.

6. Does it ?.


If you do NOT hear it run, in most cases the fault is the fuel pump relay or the fuel pump..


As soon as you turn ON the ignition switch to start the engine a 2 second ONLY battery voltage signal is sent from the computer to the fuel pump relay and from the relay back to the fuel pump in the fuel tank. This runs the fuel pump for ONLY 2 seconds of which pressurizes the fuel system in preparation to start the engine.

Once the engine starts, The computer BYPASSES the fuel pump relay and  sends constant contionous battery voltage from the computer to the oil pressure switch of which is now CLOSED because the oil pressure is UP because the engine is running. Therefore the battery voltage flows thru the oil pressure switch back to the fuel pump to run the fuel pump constantly until you turn OFF the engine.