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#1
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Cold start problem, high idle 91 300E 4matic
Just looking for some ideas on what could be causing cold start problems and a high idle speed on a 1991 300E
Over the past 2 weeks cold starting has become more difficult, the normal 1 turn of the engine is now 7-8, usually requiring a second crank to get it to catch. Once started you can turn off and it will start first time no problem. The second problem is a high idle even when warm of about 1,000 - 1,200 rpm. I am wondering whether they are linked, perhaps to the Idle Control Valve which is dead or needs cleaning out. I was also wondering if the OVP relay may give these symptons if it had gone. Any thoughts appreciated. |
#2
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I'd begin with the OVP relay. Cold start enrichment is a function of the CIS-E which is powered by the OVP. The idle valve is supplied current by the OVP relay as well. THe idle valve when unpowered will default to a larger cross section causing the high idle. When replacing the relay be sure to clean any corrosion from the connector and make sure the female pin sockets are tight.
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#3
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Speaking from experience, I would remove ALL linkage including pivot points and lubricate. The speeds you indicate are not within the ranges of electronic control, but within the ranges of binding linkage.
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Auto Zentral Ltd. |
#4
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I'll check the OVP, is it as simple as checking for 12 volts at the ICV connection, and if I get zero voltage then it is more than likely the OVP relay.
Thanks Justin |
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