Gmc - Safari :: Slight Rough Idle With Noticeable Dimming Of Dash Lights In Dark At Idle?


Nov 23, 2011

2000' GMC safari's electrical system. To begin, she has 95,000mi, an although that's about a year old, a duralast gold battery about the same age, and 13.8 volts at idle on the meter at the battery. The problem, over the past couple of weeks, I'll start it and drive off as normal, an the thing wants to stall for about two seconds. After that, no problem whatsoever. One time, it actually did stall on me, and everything went dead for a couple of minutes, no juice whatsoever; noticed that even the clock in the radio read 12:00. After a few minutes, I tried to turn the key again, and it started right up. This a.m., I went to start the van, and it initially would not turn over. The started motor turned but in a weak manor. At that point we went completely dead again, no electricity whatsoever.

The strangest thing is what happened next, I pulled the hood latch release as I was about to investigate and noticed the guages on the dash move when I did, power was back. The van then started but barely, and when it did it stumbled for a few seconds before driving off without so much as a hiccup the rest of the day. The only other possibly related symptom would be a slight rough idle combined with a just noticeable dimming of the dash lights in the dark at idle. Also, I should mention that I have checked the battery terminals and they are tight and clean, the van is in excellent shape mechanically, averaging 20mpg combined, smooth acceleration, no leaks, "using oil", white or black smoke, etc. Plugs, cap, rotor, and pcv are recent. Egr and maf are both clear.

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So - if the CEL went out, would a code still be stored? I know blinking is bad, but it went out after a few blinks. It didnt even stay solid, just went out. There was no message on the display screen either (no "Stop Car" or "Emissions Workshop" etc) First time this has happened. I read on PW that it could be the ICM. I'm hoping it's just a random anomaly.

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