Spark plug state check

Make

Alfa Romeo

Model

159 Factory Service Manual

Year

2005–2011

Section

Engine ignition › Spark plug state check

Electrical equipmentSpark plug state check

SPARK PLUG STATE CHECK

Check 5510DA

1.9 JTS, 2.2 JTS

	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
1	Disconnect the high tension lead from the individual spark plugs and check that there is no microwelding at the terminal of the actual spark plugs	Replace the damaged spark plugs Op. 5510D10 SPARK PLUGS - R+R
2	Remove the spark plugs from the engine head Op. 5510D10 SPARK PLUGS - R+R and check that there are no signs of fouling like those illustrated in the diagrams below	Move on to Step 6

	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
3	Check that the spark plug earth electrodes are not bent or out of alignment as illustrated below	Move on to Step 6

	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
4	Check that the spark plug ceramic insulator nozzle is not damaged as illustrated below	Move on to Step 6

	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
5	Using a tester, check that the resistance between the connection terminal and the centre electrode (shown in the diagram below) for each spark plug is between 2 and 50 kOhm. The test is over	Replace the spark plugs outside the range Op. 5510D10 SPARK PLUGS - R+R

	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
6	Connect the diagnostic equipment and check that error P0300 is present together with at least one other error out of P0301, P0302, P0303, P0304	Replace the set of spark plugs Op. 5510D10 SPARK PLUGS - R+R
7	Replace the spark plugs in the cylinders where the error was detected (e.g. for P0301 the spark plug for cylinder 1) Op. 5510D10 SPARK PLUGS - R+R

17 Electrical