What are the speed sensors on a 944?
For 944s through 88, there are two hall-effect sensors. These are both situated to get crank position information from the ring gear and flywheel. These sensors are referred to as the speed sensor and the reference sensor. They are fairly reliable but a first place to look if problems crop up.
How are crankshaft sensors installed on a Porsche 911?
When installing sensor mounting bracket, position sensor tip correct distance (A) from toothed wheel using slotted bracket mounting bolt hole (arrow). Crankshaft Sensor Clearance Specifications • Sensor tip to toothed wheel (A) 0.08 mm (0.031 in.) • Tighten sensor mounting bolt. • Be sure wiring is correctly routed into engine compartment.
Can a Bosch sensor be replaced by a Porsche sensor?
The male portion of the connector is very hard to find/buy but comes with a replacement sensor. The Porsche/Bosch sensor itself can be replaced by a BMW/Bosch sensor that fits and works perfectly and it is somewhat cheaper. Its only downside is that the cable for it is about 6 inches longer than needed.
What causes reference sensor to fire at wrong time?
Because the starter is located close to the sensors, a somewhat common problem can occur with electromagnetic interference. Basically, the magnetic field generated by a rotating starter motor can induce a false trigger of the reference sensor which causes the ignition to fire at the wrong time.
When installing sensor mounting bracket, position sensor tip correct distance (A) from toothed wheel using slotted bracket mounting bolt hole (arrow). Crankshaft Sensor Clearance Specifications • Sensor tip to toothed wheel (A) 0.08 mm (0.031 in.) • Tighten sensor mounting bolt. • Be sure wiring is correctly routed into engine compartment.
For 944s through 88, there are two hall-effect sensors. These are both situated to get crank position information from the ring gear and flywheel. These sensors are referred to as the speed sensor and the reference sensor. They are fairly reliable but a first place to look if problems crop up.
The male portion of the connector is very hard to find/buy but comes with a replacement sensor. The Porsche/Bosch sensor itself can be replaced by a BMW/Bosch sensor that fits and works perfectly and it is somewhat cheaper. Its only downside is that the cable for it is about 6 inches longer than needed.
Because the starter is located close to the sensors, a somewhat common problem can occur with electromagnetic interference. Basically, the magnetic field generated by a rotating starter motor can induce a false trigger of the reference sensor which causes the ignition to fire at the wrong time.
What’s the fuel level on a Porsche 924?
The O2 sensor allows the frequency valve to adjust the fuel level as the air/fuel mixture changes. It’s normal for it to be constantly changing. 0.75mV at idle sounds right. So, varying readings of .5V to .8V sounds right also.
Why is the speed sensor on the flywheel?
A mis-adjusted setscrew (on the flywheel) can cause a broken sensor bracket. The speed sensor senses crankshaft movement and 1) feeds the tachometer, and 2) enables the ignition and fuel pump via the DME relay. A basic check of the speed sensor is to see the tach’s needle bounce during engine cranking.
Where is the fan switch on a 924?
The switch is located in the upper left corner of the radiator. Remove the two wires from the switch. If the fans come on when the two wires are touched together (at any temperature), but not when the engine is hot, then the switch is bad.
Where is the temperature sensor on a Porsche 924 Turbo?
— Unscrew temperature sensor from intake manifold and place it in the fresh air tray behind the engine fire wall, leaving the wire connected (sensor temperature must be below 50 °C — 120 °F). A suitable plug (M 14 x 1.5) must be screwed in the opening of the intake manifold during adjustment procedures.
Where is the ignition plug on a Porsche 924 Turbo?
A suitable plug (M 14 x 1.5) must be screwed in the opening of the intake manifold during adjustment procedures. Tip: Use stop screw from manual transmission 924, Part No. 088.311.721. — Run engine to operating temperature (about 90 °C oil temperature). — Connect CO tester according to instructions supplied with tester.
What happens if the flywheel fails on a Porsche?
• If the flywheel sensor fails, the entire ignition system will not operate. The engines for USA and Canada have the ignition system “DITC” in conjunction with the oxygen sensor system. The circuitry of the oxygen sensor control unit has been changed because of this modification and the revised oxygen sensor system operation.
The Porsche/Bosch sensor itself can be replaced by a BMW/Bosch sensor that fits and works perfectly and it is somewhat cheaper. Its only downside is that the cable for it is about 6 inches longer than needed. Hint: when you replace your sensors, keep one of the old ones and use it (together with a glued, thin washer) as an adjusting tool.
What can I do about my Porsche 944 battery leak?
Battery tray leaks (clarks-garage.com) Excessive battery discharge rate (clarks-garage.com) Battery replacement (944time.com) Fan speed resistor repair (944time.com) Allen head and cheesehead bolt removal (clarks-garage.com) Check the brake system (clarks-garage.com)
What does the speed sensor on a flywheel do?
speed sensor. It senses movement of the flywheel and signals the DME to turn on the fuel pump. When set correctly it is positioned very close to the ring gear teeth (0.8 mm). If set too far away from the gear, it may be slow to sense movement, too close and it gets chewed up by the ring gear.
Where can I find a Porsche 944 wiring diagram?
DME wiring diagram – 944 normally aspirated (clarks-garage.com) Technical information and testing (clarks-garage.com) Removal, installation, and adjustment (clarks-garage.com) Door handle tune up (pelicanparts.com) Engine oil and filter replacement (clarks-garage.com)
Which is the best place to repair a Porsche 944?
Check the brake system (clarks-garage.com) Checking brake pad thickness and brake pad replacement (clarks-garage.com) Fluid replacement and bleeding (clarks-garage.com) Master cylinder replacement (clarks-garage.com) Parking brake adjustment (clarks-garage.com) Rotor inspecting and replacing (clarks-garage.com)