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Michael, Auto Service Technician
Category: Car
Satisfied Customers: 919
Experience:  21yrs.Foreign and domestic driveability diagnosis and repair/ ASE Cert./Fuel Injection Specialist.
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1996 pontiac sunfire: cylinder..misfires..firing..coil pack

Customer Question

I have a 1996 pontiac sunfire and when i hooked a code scanner to it the scanner read random/multiple cylinder misfires.i pulled each plug and they are all firing,but 2 and 3 are not as strong as 1 and 4.i replaced the 2-3 coil pack and the problem is still there.i am wondering if i should replace the ignition control module.
Submitted: 11 years ago.
Category: Car
Expert:  Michael replied 11 years ago.

That is highly possible on your vehicle.Especially because you have the random misfire.But first make sure the coils pass the test I post below and that there are no traces of arcing on the plug wire tubes(White marks or cracks) which is also a common failure on this engine.If you need larger pics just let me know and I'll enlarge and post it.

2.2L (VIN 4) Engine

  1. Remove the ignition coil(s).

  2. Using an ohmmeter, check the resistance between the primary terminals on the underside of the coil. The resistance should be 0.50-0.90 ohms.

  3. Check the resistance between the secondary terminals. It should be 5000-10,000 ohms.

  4. If the coil failed either test, replace the coil.

2.2L Engines

See Figures 1 and 2

  1. Disconnect the negative battery cable.

  2. On 1995-97 models, raise and safely support the vehicle.

  3. Remove the ignition coils from the module.

  4. Remove the module from the assembly plate.

  5. Installation is the reverse of the removal procedure.

Click image to see an enlarged view
Fig. 1: The ignition module or (ICM), is located under the coils