Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
HelloCustomer For the car to stall, you are either losing fuel to the engine or spark at the spark plugs. Before you replace anything else, let's figure out what we are losing. This is the first thing I want you to do. Keep a can of carburetor cleaner in the car with you, When the car stalls, try to restart, if it doesn't start, Take the air snorkel off of the top of the throttlebody, Spray a liberal amount of carb cleaner into the throttle body. Try to start the car, see if it tries to start. Any signs of life are what we are trying to see here. If it stumbles and stalls or starts for a second, we can assume it has spark and fuel is our issue. If it does not make any change at all, remove one spark plug wire, insert a screwdriver into the end and place it near a metallic surface. You may need a second person if you can't position this so you can see it. Crank the engine, is there good blue spark. Let's start with these tests first. Let me know what you find and we'll continue with the next steps.
Your JA Expert,
Ok, that pretty much makes me feel confident that we have a fuel issue. I think we are dealing with a fuel pump. Your engine has a fuel pressure test fitting on the fuel rail, let's get a fuel pressure guage on this vehicle. Tape it to the winshield and go for a ride. Let's make sure fuel pressure is dropping when these episodes occur. If so, I want to verify power to the fuel pump when the car is dead. If so, we are going to look at this fuel pump and fuel filter. If fuel pressure remains high, we are going to focus on fuel injector pulse. The fuel pressure you should find is:
At the fuel pressure regulator you will find a vacuum line connected to it. This is where you would either disconnect or reconnect the vacuum hose. Here are two pictures to help you find it.
Here is the location of the test port. It's under this cap.