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Old 24 Dec 2008, 01:05 pm
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Default 89 Integra erratic idle, alternator warning on

Got a high mileage 89 Integra. It's developed an erratic idle. Speeds up to around 1500, then drops to around 500 for an instant, then back up. I replaced the temperature sensor and it seemed to go away for a couple of weeks. Yesterday, it came back but worse. When the rpms drop, the alternator and headlight motor warning lights sometimes come on and won't go off until I hold it above 1300 or so. I have a check engine light showing #9 which is the #1 cylinder position. This engine has a separate position sensor on the front camshaft. I don't really know where to start on this one. Anyone have any ideas? I don't understand the relationship between the idle and the alternator light coming on.

What about the cam position sensor? I checked the resistance on it and it showed open. Haynes says my engine's position sensors are all built in on the distributor, so it's no help here. Would it cause the intermittent idle problems?


Last edited by dlmcmurr; 24 Dec 2008 at 11:50 pm. Reason: corrected the ECU code definition and cps test result
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Old 04 Jan 2009, 12:07 pm
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Smile Re: 89 Integra erratic idle, alternator warning on

Just an FYI,

Turns out the alternator was failing. In this model, it feeds an electrical load sensor built into the under-hood fusebox which in turn feeds the signal to the ECM. Evidently this alternator failing was upsetting the ECM. Maybe this will help out someone else.

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