Why does my Porsche 993 engine not start?
This article applies to the Porsche 993 (1993-1998). You try to start your Porsche 993, and it’s just not happening. The engine cranks over but nothing more. There could be many reasons for this scenario, but when the engine doesn’t start it usually has to do with either lack of fuel pressure, or weak/no sparks from the spark plugs.
Why is my Porsche 993 DME relay not working?
The relay powers both the DME and fuel pump on the 993 so if you are having fuel pump electrical issues you will need to check both the relay and the fuel pump fuse. These relays are prone to failure; a lot of failures. They usually fail from broken joints in the circuits but they can also fail from the diode and or have issues with heat sink.
Do you need a battery to start a 993?
Continue reading to learn how to diagnose a 993 with starting issues. The 993 needs a good battery in order to power fuel and ignition as well as crank the engine over fast enough to start. To check the condition of the battery, it has to be measured while under load. To do that you only need a multimeter that can measure at least 15 volts.
Why does my 993 key fob not start?
Try replacing the relay with a known good one. Another possibility is that the immobilizer is being triggered. 993 key fobs have a wireless transmitter that speaks to a receiver in the car. If they become out of sync with each other, the car won’t start. Having the fob re-learn itself to the car can fix this problem.
This article applies to the Porsche 993 (1993-1998). You try to start your Porsche 993, and it’s just not happening. The engine cranks over but nothing more. There could be many reasons for this scenario, but when the engine doesn’t start it usually has to do with either lack of fuel pressure, or weak/no sparks from the spark plugs.
The relay powers both the DME and fuel pump on the 993 so if you are having fuel pump electrical issues you will need to check both the relay and the fuel pump fuse. These relays are prone to failure; a lot of failures. They usually fail from broken joints in the circuits but they can also fail from the diode and or have issues with heat sink.
Continue reading to learn how to diagnose a 993 with starting issues. The 993 needs a good battery in order to power fuel and ignition as well as crank the engine over fast enough to start. To check the condition of the battery, it has to be measured while under load. To do that you only need a multimeter that can measure at least 15 volts.
Try replacing the relay with a known good one. Another possibility is that the immobilizer is being triggered. 993 key fobs have a wireless transmitter that speaks to a receiver in the car. If they become out of sync with each other, the car won’t start. Having the fob re-learn itself to the car can fix this problem.
How to know if your engine has no spark?
First Confirm Your Engine Has No Spark. 1 Disable the fuel system by removing the fuel pump fuse or relay. 2 Insert a spark plug tester into the plug boot and ground it on a piece of metal on the engine. 3 Finally, Have someone crank the engine and watch for spark.
What to do if your Porsche 911 engine wont start?
2. Remove the air cleaner cover and air filter, and spray some fuel into the intake. You will have to hold open the little “door” inside there with something. If it starts briefy then dies you probably have a fuel problem. 3. You can jumper a hot wire to the fuel pump and listen to it whir to prove that it’s working.
First Confirm Your Engine Has No Spark. 1 Disable the fuel system by removing the fuel pump fuse or relay. 2 Insert a spark plug tester into the plug boot and ground it on a piece of metal on the engine. 3 Finally, Have someone crank the engine and watch for spark.
Why does my car not start with no fuel pressure?
The Digital Motor Electronics (DME) is a computer that controls the fuel pump. A faulty DME relay could therefore make it impossible to start the engine since there is no fuel pressure. The engine can still crank over, but without any fuel pressure it won’t ignite any fuel and the engine won’t start. Figure 3.
What happens if the fuel pump doesn’t work?
If the fuel pump doesn’t work, the engine will crank over but it will never start since there is no fuel to spark. Check the fuse for the fuel pump in the fusebox. While you are there, you might as well check the other fuses just to make sure that no other fuse is causing any problem.