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  #1  
Old 09-13-2011, 03:30 AM
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86 420 sel idle issue

I have an idle issue: begin idling around 650 rpm, then over a 10 sec period slowly ramps up to 1000 rpm then instantly drops to 650 and repeats the cycle. Any thoughts on this problem.

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Old 09-13-2011, 03:46 AM
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Hello franksi welcome to the forum.

It sounds like the idle is set too low. Have a quick check in the owner's hand book - I don't know what it is meant to be. Most engines don't idle that low => 750 - 800 - 850 is more common.
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Old 09-13-2011, 04:02 AM
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CA Emissions label says 12 degrees btdc @ idle 650 rpm -50 +100, ie 600-750rpm. Any ideas why the loping idle? What causes the cyclic idle speed issue?. Checked and cleaned the idle control valve and it helped slow the idle, as it was sticking, however the cyclic idling remained.
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Old 09-13-2011, 04:11 AM
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Quote:
Originally Posted by franksi View Post
CA Emissions label says 12 degrees btdc @ idle 650 rpm -50 +100, ie 600-750rpm. Any ideas why the loping idle? What causes the cyclic idle speed issue?. Checked and cleaned the idle control valve and it helped slow the idle, as it was sticking, however the cyclic idling remained.
Sorry I can't "help" you any further. I would be checking the condition of tubing though... but wait a few more hours and more people will start to join in. The east coast (USA) breakfast club will be out of bed soon!

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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