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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-20-2008, 08:08 PM   #1
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Default Car sputtering

Hi, I hope someone can help me, I have a '97 Bonneville with th NA 3800 and on a recent road trip, it lacked power, and sputtered a great deal.
I noticed it also flashed the check engine light when I slowed down but it went off if I accelerated.
When idling, it seems to shake, but there is no pattern to it (like if you pulled 1 spark plug) sometimes it seems almost normal, other times I am not sure if I will make it home its so bad.

Up to that last road trip, this car has been perfect. It always gets its maintenance like clockwork, and I respect the car so it isn't abused...

Any advice? Thanks for looking!!
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Old 04-20-2008, 08:21 PM   #2
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get the codes read. flashing CEL is never good
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Old 04-20-2008, 08:26 PM   #3
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Is that something that I need a dealers garage to do, or can I do it myself?
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Old 04-20-2008, 08:30 PM   #4
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Before checking codes go out & check the oil level & coolant level. Let'* rule out the worse case scenario first.
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Old 04-20-2008, 08:41 PM   #5
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Thats what I thought as well. But there is no trace of oil in the coolant or vice versa...

I should also mention it has 227000 km on it and doesn't burn or use oil, and up until now only required a fuel pump in 2006 and tires in '07, other than that this car has been perfect since I bought it.
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Old 04-20-2008, 09:01 PM   #6
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I have noticed a pattern to the "check engine light" flashes. It flashes 7 times then quits for awhile, then flashes 7 times again.
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Old 04-20-2008, 09:02 PM   #7
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Other than the obvious tune up stuff, plugs ,wires etc you can get the codes scanned from most parts stores for free. Auto zone, Advance and others.
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Old 04-20-2008, 09:07 PM   #8
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Whew - one of those in a day is enough.

Some of the auto parts stores will scan them for free. Write down the codes & let us know what they are before buying any parts.

If you want something to do tonight then pull the plugs & let us know what they look like. Keep track of what cylinder each one comes from. A picture of the plugs would be great.
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Old 04-20-2008, 09:14 PM   #9
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Ok, I will try to get it in tomorrow for the codes, and try to get some pics of the plugs as well if I get a few moments. I haven't been driving it if I can help it for these past couple of weeks (since the problem started).

I just went out and rechecked the oil/coolant. Both are right up there and the coolant is clear.
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Old 04-20-2008, 09:37 PM   #10
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The flashing CEL indicates raw gasoline is getting to the cat convertor. Drive it as little as possible because the cat can be damaged from this. Here'* a link to another check you can do if you have a multimeter. http://www.bonnevilleclub.com/forum/...e=article&k=33
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