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560SEL High Idle
Hello.
I have a weird problem with the idle of my car, a Mercedes 560SEL W126 M117 engine. The idle must be a 650 rpm (+/-50) in P or N, and 550 rpm (+/-50) in D o R. Now is about 1000 rpm. I have 3 used idle control modules, with any of them the idle is the same. I have 3 used idle control valves, and here is the problem. I cleaned the 3 ICV soaked it for a few days in carb cleaner. I tried one of them, and the idle go to 650 rpm PERFECT!! But once the car is warm, the idle went again to 1000 rpm. So I tried another ICV with the engine warm, and the idle was at 650 rpm, but after drive 5 minutes, the idle again at 1000 rpm. Tried the last ICV and the same result. Before I've changed the 4 pole temperature sender, but the older one was in resistance specs. I check the miliamperes at the ICV idling= around 1000 Ma. I check the Volts at the ICV idling= around 4,25 V. I check the resistance at the ICV disconected= 5 Ohmns. The idle switch is new and rechecked= Ok There's no vacuum leaks, I changed all intake manifold gaskets, rubbers and vacuum lines and elbows. The CO is at 1,5%, my car is NON KAT, so don´t have O2 sensor. Any advice will be wellcome |
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