1994–1998 Saab 900
By Tom Becker ✓ Certified Mechanic · Published Sep 24, 2026 · Updated Oct 14, 2026
Save $268 by doing it yourself! Shop cost: $344
Quick answer: Spark Plug Replacement on a 1994–1998 Saab 900 is rated Moderate and takes about 45–90 minutes. You'll need 5 tools for this job, and parts cost about $76. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name | Part Number | Price | Buy |
|---|---|---|---|
| Spark plugs, OE spec (4) | — | $19.00 | |
| Distributor cap | — | $23.00 | |
| Rotor arm | — | $21.00 | |
| Dielectric grease | — | $13.00 |
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Follow these steps carefully
With the engine fully cold, disconnect the negative battery terminal and remove the ignition cover if fitted. Identify the distributor at the end of the cylinder head and the four plug leads. Photograph the wire routing before disturbing anything.
Pull the plug lead off by gripping the boot — never the wire — and twisting gently. Remove the plug with a 5/8-inch socket and extension, keeping it with its lead. Inspect the boot for cracks or white tracking marks.
The photo of the wire routing is my most important tool in this job — I've seen distributor caps that don't forgive a wrong firing order, and a misrouted lead runs rough in a way that looks exactly like a bad plug.
Unclip the distributor cap and expose the rotor arm. Compare the old cap and rotor with the new parts, noting the rotor position and terminal layout. Fit the new rotor onto the shaft, seating it fully on its drive.
Gap each new plug to the underhood spec and thread it in by hand to protect the aluminum threads. Torque to spec; the NG900 head strips easily if overtightened. Push the lead boot firmly onto the plug until it clicks.
The NG900's aluminum head is genuinely easy to strip — I thread every plug in by hand first, and if it binds on the first turn I back it out and start over, because forcing it costs me a head.
Repeat the one-at-a-time plug swap for the remaining three cylinders so the firing order never gets mixed up. Seat the new distributor cap and clip it down evenly. Reconnect each lead to its correct cap terminal, checking against your photo.
Reconnect the battery, start the engine, and listen for a smooth, even idle. Drive the 900 through idle, cruise, and boost (on turbo models) to confirm clean running. If a misfire appears, recheck the lead seating order first.
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
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