Question about 2002 Buick Century

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Missing intermittenly, shows problem with #2 cylinder. Could it be the coil and can you purchase separate coils.

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Theses coils are separate, but handle 2 cylinders at a time. So in your vehicle you should have 3 coils.Random misfire may be caused by the following: due 4 tune-up, faulty coil, faulty spark plug, faulty plug wire, faulty cam or crank sensor, poor cylinder compression, intake/head gasket leaks. Before replacing parts, make sure that #2 cylinder is diagnosed for the misfire. Otherwise you'll be changing out good parts, and spending more $$$!!

Posted on Oct 05, 2010

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What controls the fire to the coil


The ignition system is controlled by the Powertrain Control Module (PCM) on all engines.
Here is a generic breakdown of most ignition systems incorporated after 1996;

The system uses separate ignition coils for each cylinder. The one-piece coil bolts directly to the cylinder head. Rubber boots seal the secondary terminal ends of the coils to the top of all 6 spark plugs. A separate electrical connector is used for each coil.
Because of coil design, spark plug cables (secondary cables) and a distributor are not used.
Two knock sensors (one for each cylinder bank) are used to help control spark knock.
The Auto Shutdown (ASD) relay provides battery voltage to each ignition coil.
The ignition system consists of:
  • Spark Plugs
  • Separate Ignition Coils
  • Knock Sensors
  • Powertrain Control Module (PCM)
  • Also to be considered part of the ignition system are certain inputs from the Crankshaft Position, Camshaft Position, Throttle Position, 2 knock and MAP Sensors

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I have a 1999 Lexus ES300 and I ran an OBD2 code reader on it. It gave me an error code of P1305. Which states Igniter #2 circuit malfunction. Is the igniter the same as the coil? This problem happens...


P1305 Igniter Circuit Malfunction No. 2 (1998-2000 Land Cruiser, 2000 Celica & Tundra)
this code is a toyota code so i would say it means the coil but the generic code says its cylinder no 5

P0305....Cylinder 5 Misfire Detected

so somewhere their is a faulty coil

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did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
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The car is missing it was said to be the fuel injector it was changed and the problem still is still there. I saw blue sparks down toward the backside of the motor


Hello...

Assuming that you have the V-6 engine, It sounds like you have a problem with one of the coil packs. To fix this you need to know which cylinder has the miss. Then replace the coil that drives that cylinder. FYI. Each coil normally drives 2 cylinders, making for a total of 3 coils in the pack. Each can be replaced separately.

Good Luck..... TJ

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