Saab 9000 Service Manual page 223

220 Fault diagnosis
Poor driveability (contd.) -
3
3 Check for leakage
- Check for leakage in the hose connected to the
fuel pressure regulator.
4 Check the electrode gap
The spark plug electrode gap is extremely important ·
for proper engine performance.
The spark plug gap should be 1.0+0.1
- 0.0mm
Too wide a gap will cause misfiring under full load
conditions. Too small a gap will result in lumpy idling
and hesitant running under light load conditions.
5 Inspect the spark plug insulator tips
- Check the colour of the spark plug insulator tips.
. If the insulator tip of any plug is noticeably lighter in
colour it may be because this cylinder is receiving too
weak a mixture.
- If this is the case, check the flow capacity of the
injectors. See "Adjustment/replacement of
components" on page 294.
1mm+0.1mm
-0.0mm
Saab9000
4
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5
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