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SL/R129: Idle Speed Issue

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Old Sep 27, 2022 | 07:57 PM
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kwelch02's Avatar
kwelch02
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From: Ann Arbor Michigan
1996 sl 500
Idle Speed Issue
I have a 96 SL500. Today I replaced to engine vacuum hoses because they were all very brittle. These included the tubes running across from the left side to the right side, tubes from valve cover to air intake and small lines that run from the front of engines to the back. All appeared to go well. I have double checked and everything is connected.

Now, when starting the car, the engine idle speed starts out at 2000, drops a little and then accelerates to 3000 and never slows down.

Any ideas?


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Old Sep 30, 2022 | 01:41 PM
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Kebowers47
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From: Houston
001 s600, 94 sl600
Sounds like you did not install the crankcase ventilation hose/restrictor valves correctly, allowing unlimited. crankcase vapors into the manifolds.
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Old Sep 30, 2022 | 03:37 PM
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kwelch02
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From: Ann Arbor Michigan
1996 sl 500
Is that the large hose that goes from the Valve cover to the air intake horn?

Originally Posted by Kebowers47
Sounds like you did not install the crankcase ventilation hose/restrictor valves correctly, allowing unlimited. crankcase vapors into the manifolds.
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