Checking Starter Operation

Overview

This procedure tests the starter on your Porsche 944 with its 16v engine to diagnose why the engine won’t crank. It’s designed to pinpoint whether the starter, ignition switch, or wiring is at fault. For the 944, the starter is located near the transmission, and this guide ensures safe testing specific to its 16v setup.

Tools Required

• Jack stands
• Two heavy-gauge jumper wires (minimum 12 gauge), approximately 3 feet (0.9 meters) long

Parts Required

None (unless replacement is needed: starter – 944 604 105 00 or solenoid – 944 604 105 01)

Step-by-Step Procedure

Step 1: Prepare the Vehicle

1. If the starter isn’t turning, first check the battery to ensure it’s in good condition. Follow this link to ensure this step – Battery Testing – of the process is followed accurately.
2. Lift the Porsche 944 using a jack and secure it on jack stands to access the starter, located on the driver’s side near the transmission bellhousing.
3. Ensure the transmission is in neutral (not engaged in any gear) to prevent movement during testing. For the 944’s manual transmission, confirm the gear lever is in the neutral position.

Step 2: Set Up the Jumper Wires

4. Prepare two heavy-gauge jumper wires, each at least 12 gauge and about 3 feet (0.9 meters) long.
5. Locate the starter on the 944’s 16v engine, mounted low on the driver’s side near the transmission.
6. Attach one jumper wire to the small terminal on the starter solenoid (the control terminal, typically a spade connector, not the one wired to the starter motor).
7. Connect the second jumper wire to the large positive terminal on the starter, which links directly to the battery. Ensure the free end doesn’t touch any metal parts of the car.

Step 3: Test the Starter

Caution: Do not test the starter while under the vehicle. The 16v engine will turn during this test, posing a safety risk.

8. Stand clear of the vehicle and avoid touching any metal surfaces.
9. Briefly touch the free ends of the two jumper wires together to activate the starter.
10. Observe the starter’s response:

If the starter spins and the engine cranks smoothly, the issue lies with the ignition switch or wiring from the switch to the starter.
If the starter doesn’t turn or only clicks, the problem is within the starter itself.

Step 4: Diagnose and Address the Issue

11. If the starter works with the jumpers, inspect the ignition switch and wiring (specific to the 944’s electrical layout) for faults.
12. If the starter fails, remove it from the vehicle. For the 944, this involves disconnecting the battery, removing the intake manifold for better access (optional), and unbolting the starter from the transmission.
13. Take the starter to a service center for testing. For the 944’s 16v engine, the likely culprit is the solenoid (944 604 105 01). Replace it or the entire starter (944 604 105 00) based on cost and condition.

Post Procedure Checklist

• Ensure the jumper wires are removed and stored safely.
• Lower the vehicle off the jack stands and confirm it’s stable on the ground.
• If the starter worked during testing, start the engine with the key to verify the fix.
• Listen for abnormal noises from the starter area after repairs.

Sources

• Clark’s Garage
• Pelican Parts
• Porsche 944 Workshop Manual, Volume 1
• YouTube