Troubleshooting Lh-Jetronic - Porsche 928 Workshop Manual

928
LH-Jetronic 24
Testing
Conditions
Engine in good
operating condition
Battery charged
Starter turning
See Test Point
Engine does not start
Engine hard to start
Erratic idling
Poor pickup
Misfiring
High fuel consumption
Poor power output
Engine hesitation
X = Check with suitable tester
LH-Jetronic
Possible Causes of Defects
F .-
;
E
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E
z
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z
.F $
;
29 g
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al
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$ 11 .E n .k
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5 2
e I? z
8
1 ?I
1 2 3 4 5 6 7 8 9
x x X
X X
x x
X x x
X X
x x
X x x
x x x x
X
x x
X
x x
x x
x x
x x
x x
X
x x
x x
X
X
X
x x
X
X
X
X
x x
X
X
x x
Printed in Germany VI I I, 1984
Troubleshooting LH-Jetronic 24 -111