spark plugs AUDI A4 1995 B5 / 1.G APB Engine Ignition System Checking

28-4
Technical data, ignition system

Engine code
APB
Engine idle RPM
Not adjustable - controlled by
Idle Air Control (IAC) 750 - 850 RPM
RPM limit

Operates by closing
throttle valve
Operates by shutting off
fuel injectors
approx. 6800 RPM
Ignition timing is determined
by the control module.
Ignition timing cannot be
adjusted.
Ignition system Single-coil system with 6 ignition coils located above spark plug connectors and installed
directly on spark plugs. The power output stages are located as separate components in air
cleaner housing.
Spark plugs connectors Resistance approx.: 2K Ohm
Firing order 1-4-3-6-2-5
Pa
ge 5 of 64 I
gnition s
ystem, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.28.1

28-6

- With the engine running disconnect harness
connectors in sequence from fuel injectors, and
observe the engine performance.

or

- Compare spark plugs of all cylinders with each
other and check for soot on the electrodes.
When the faulty cylinder has been identified:

- Connect hand-held multimeter (resistance
measurement) to spark plug connector:

Note:
The spark plug connector can be disconnected
from the ignition coil.

Specified value: approx.: 2K Ohm.
Pa
ge 7 of 64 I
gnition s
ystem, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.28.1