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Old 07-02-2002, 10:19 AM
Carl Cottrell
Posts: n/a
Unhappy 16v dies when you turn on the ac

I have an '87 16v and when you turn on the air and you are driving down the road the car will die. Especially when the weather is hot.

I just recharged the system. Any ideas as to what is wrong?
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Old 07-04-2002, 10:33 PM
Registered User
Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 358

I may not be much help. I notice on my 16V that the AC makes a noticeable drag on the engine, especially when the system is properly charged. When the AC compressor engages the idle speed adjusts to compensate for the increased load. Is this working on your car?
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Old 07-04-2002, 11:15 PM
Carl Cottrell
Posts: n/a
It seems to be working but when you come to a stop sign and push in the clutch the rpms will drop way down and die.
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Old 07-04-2002, 11:20 PM
GermanStar's Avatar
Annelid wrangler
Join Date: Apr 2002
Location: Fountain Hills, AZ
Posts: 4,918
You may want to get your compressor checked out. This doesn't exactly apply to your car, but I have heard of 190Ds for example that wouldn't run at all because of bad ac compressors.

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Old 07-04-2002, 11:59 PM
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596
Carl Cottrell,

The issue is more likely a problem with the idle motor. I wrote of my experience with this before, but it was similar to yours. Without the air conditioning on, the car did not always stall when you slowed down and put the clutch in, but it did it with pretty irritating regularity. Then, if you had the a/c on, it did it all the time. I also noted the a/c idle speed increasing feature worked erratically.

I had the Oxygen sensor and the idle motor changed. The idle motor is the aluminum cylinder between and under the intake runners for the number 2 and 3 cylinders. It is part of a system only a German engineer steeped in the tradition of "why make it simple when it is easy to make it complicated?" could design. Anyway this thing apparently spins a cylinder inside that has an orifice that passes air used for idling only when certain ports line up, or something. I am not clear on how it works, just that when it doesn't, you lose control of the idle function. Any abrupt or difficult idling situations and the car stalls.

Others on this site have reported removing the idle motor, filling it with carb cleaning fluid, and turning the mechanism by hand (through the port) and rinsing it out. Another gas rinse and then the inner rotating cylinder gets freed up and it goes back in, apparently ready for another lifetime of idle control.

I only mentioned the Oxygen sensor because it was replaced at the same time. It was not cited by the mechanics as the culprit in the idle fix.

Hope this helps, Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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