I have a '94 960 with idling problem (no idle, very high idle 2000 rpm). The car runs on LGP and petrol and I have the issue in both mode I have changed the idle control valve and the air mass meter (second hand parts) without result
For now I have replaced the control valve with a manual one and it is working "fine" in LGP mode, but it is still unusable in petrol mode (the engine speed is fluctuating, and stops, even when I accelerate).
It seems that the idle control valve is receiving some bad signals but I don't know which sensors are involved (temperature, AC, pollution, ...).
And the same here with my '90 765T, B230FI. It's resting at the moment because I'm tired of chasing down every last little thing that could be wrong with it and still not finding a solution. The idle problem got steadily worse and the car is now undriveable. It's also running extremely rich. Here's what I've done so far: New air filter/fuel filter. Cleaned out IAC. Checked and adjusted throttle & switch. Cleaned inlet galleries etc. Checked AMM. Checked all vacuum lines etc. for leaks. Replaced inlet manifold gasket. Pulled all possible relays, cleaned points, checked continuity of coils, checked circuit boards. Replaced coolant temp sensor under inlet runner 3. Replaced O2 sensor. Pulled all related connectors, cleaned with contact cleaner, reassembled with silicone grease (except O2 sensor leads -- they're best left bare). Replaced spark plugs and leads. Cleaned injectors, tested for leaks and spray pattern, reassembled with new seals. Cleaned and reassembled all ground contacts. Bench tested fuel pressure control unit and checked fuel line pressures. Replaced rusty section of fuel return line and checked for unrestricted return flow. Checked rpm sensor for continuity (couldn't get the thing out but it looks okay). Tore out hair. Said rude words. And I've probably done other stuff that I don't remember now.
Is there anything I've overlooked? Is there anything you guys have done that's made the slightest difference?
I'd be really, really interested ...
Pete (fP)
"John Robertson" wrote in message news:468e2765$0$19339$ snipped-for-privacy@news.optusnet.com.au...
How have you checked the AMM? The connector on mine has become intermittent in recent years; I pull the connector off and clean it with isopropyl alcohol then reconnect it for another several months' use. When bad the idle becomes low and lumpy and the engine power is terrible. During the lumpy idle I can lift up on the AMM connector and it will surge then smooth out.
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