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Spark Plug and Ignition Coil Replacement
 
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Pelican Technical Article:

Spark Plug and Ignition Coil Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$150

Talent:

***

Tools:

Set of sockets (10mm, 5/8 spark plug socket), flathead screwdriver

Applicable Models:

Saab 9-3 2.0T (2006-07)

Parts Required:

Spark plugs, ignitions coils

Hot Tip:

Work with a cool engine

Performance Gain:

Engine runs well

Complementary Modification:

Replace air filter

The engine management systems in Saab 2.0t 4-cylinder engines control fuel supply, fuel injection, ignition and emissions. In these systems, an electronic microprocessor, the engine control module or ECM, processes a variety of sensor inputs to monitor engine and vehicle conditions. The ECM operates the engine in accordance with driver input. It has self-diagnostic capabilities in accordance with US-mandated on-board diagnostics (OBD-II) standards and stores fault codes known as diagnostic trouble codes or DTCs, which can be accessed for troubleshooting purposes.

In the system idle speed, idle mixture and ignition timing are not adjustable. OBD-II standards require the engine to operate within extremely tight tolerances maintained by feedback loops in the electronics. These standards as well as upgraded manufacturing materials and techniques allow many automotive components to function well past times and mileages that were considered normal in previous decades. As examples, engine oil and spark plugs are capable of extended life compared to the past.

Replacing the spark plugs on your 93 is part of routine maintenance. Saab recommends replacing the spark plugs on 93 standard 2.0t 4-cylinder models every 60,000 miles. As mentioned above, with all the major engine and engine management design changes over the years, spark plugs now last up to three times as long as they did in years past. This is good and bad. It means you save money and time not having to service them so frequently, but run the risk of a spark plug seizing in the cylinder head. I suggest replacing your spark plugs every three years regardless of mileage. If the last time they were serviced is unknown, replace them right away.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Saab 93 models equipped with a 2.
Figure 1

Saab 93 models equipped with a 2.0t 4-cylinder engine utilize an individual ignition coil for each spark plug, referred to as coil over plug (red arrows). When servicing your spark plugs make sure the engine is cool and leave yourself about an hour to do the job. Be careful not to drop a spark plug. If you do, replace it. The spark plug insulator can crack and can lead to an engine misfire.

Remove the engine cover on the cylinder head.
Figure 2

Remove the engine cover on the cylinder head. Remove the four T30 Torx fasteners (red arrows). Then remove the cover (blue arrow).

To remove the ignition coil electrical connectors (red arrow), slide the tab up and slide the electrical connector out of the ignition coil.
Figure 3

To remove the ignition coil electrical connectors (red arrow), slide the tab up and slide the electrical connector out of the ignition coil.

Remove the ignition coil from the cylinder head by pulling it straight up.
Figure 4

Remove the ignition coil from the cylinder head by pulling it straight up. If the coil resists, twist it when pulling up to break it free from the spark plug. The ignition coil rubber boot can become stuck to the spark plug over time.

I like to use a 5/8-inch thin-wall long spark plug socket (inset).
Figure 5

I like to use a 5/8-inch thin-wall long spark plug socket (inset). If the socket gets stuck on the spark plug, it can be easily removed from the top.

Using a 5/8-inch thin-wall spark plug socket on a 12-inch extension, remove the spark plug from the cylinder head.
Figure 6

Using a 5/8-inch thin-wall spark plug socket on a 12-inch extension, remove the spark plug from the cylinder head. Lightly lubricate the new spark plugs with copper based anti-seize. Thread the spark plugs into the cylinder head by hand. This will prevent accidental cross-threading. Torque the spark plugs. Reinstall the ignition coils and reconnect the electrical connectors. Be sure to route the wiring harness as it was before and connect the ignition coil grounds. Install the engine cover and check your work.

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Comments and Suggestions:
BUDDY Comments: How about telling me how to do this what is different on 2006 9-3 AERO. Which cylinder is #1? As I look from radiator over the motor. Is front left closest to the Radiator #1.
November 13, 2016
  Followup from the Pelican Staff: Cylinder 1 is at the front of the engine, closest to the drive belts. - Nick at Pelican Parts  

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Page last updated: Fri 12/9/2016 02:59:31 AM