Checking idle speed stabilization with rpm increase following start
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07.3—150 Checking idle speed stabilization with rpm increase following start
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Conventional tools
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Revolution counter
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Digital tester
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e.g. made by Bosch, MOT 001.3
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Testi ng
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1 Run engine at idle.
2 Pull off gray/black vacuum line (arrow) on 3 or 4-point rubber distributor (to reduce vacuum), put back again after approx. 3 seconds; idle speed should increase by approx. 500/min for a short period.
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Note: On model 123 and 126, owing to better access, the upper vacuum line can be pulled from switchover valve (43a). As a result, the decel circulating air valve (11) is provided with atmospheric air via 3 or 4-point rubber distributor (refer to function diagram).
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If there is no rpm increase, check line for passage. Renew decel circulating air valve (11), if required.
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07.3.2 Ma —150/1
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F 2
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1 Mixture controller
10 Idle speed air screw
11 Decel circulating air valve 1 2 Intake manifold
96 Auxiliary air valve
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Connection switchover valve Color code
decel shutoff gr =gray
Connection switchover valve ws = white
rpm increase air conditioning To idle speed air duct in intake manifold
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Note: For operation decel shutoff and idle speed stabilization refer to 07.3-500.
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07.3.2 I la —150/2
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F 2
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