Question about 1994 Buick Century

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1994 Buick Century - high idle, hesitation @ speed & little power

'94 century - bought with very low miles. Has had little to no power at times since purchase.

When I first start up it seems to idle very high and then slow down (but this model has no tach so it's hard to say). Idle also seems rough at times.

For the first 4-7 minutes of driving (seems to be longer in winter) I have all the acceleration I would expect from 160 hp but without fail the engine bogs down and sounds odd after that time. The lack of power varies in intensity from drive to drive but it (and my fuel economy) seems to be far worse in the winter time.

When the engine is bogged down it also seems very jerky shifting from 1st into 2nd. Additionally going uphill seems harder than it should. It gets so bad sometimes that I have the throttle 2/3 of the way to the floor to keep up with highway speeds. Also when the engine is not so severely bogged down I seem to have downshift capability at highway speed (meaning I can get a good kick of acceleration when I floor it) but when the engine is REALLY bogged down I don't get anything at all.

Another possibly unrelated issue is that the coolant temperature gauge is always offscale low except for a few rare times in the summer when I have seen it middle scale. Fuel economy in the summer is FAR better than winter. This is to be expected, I know, but I'm talking on a scale of about 2/3 the distance to a tank in the winter time.

I have put a lot of fuel injector cleaner in with no improvement. I have had the catalytic converter changed with slight (possibly imagined improvement). I have had the Mass Air Flow sensor changed (and later cleaned out) with slight improvement. Nothing seems to fix it.

The full power thing within the first 5 minutes of start indicates an electrical problem to me. I've had people suggest that the problem is my fuel pump but I don't hear anything suggesting that. This car sat through every winter from 1994 until 2007 and in that time accumulated very low miles.

Any ideas would be GREATLY appreciated.

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  • pcgeek08 May 11, 2010

    Sta-Bil, was it put in the gas tank for extended periods of time?



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Have u checked to make sure that the fuel filter isn't plugged, and it could be possible that the fuel pump is bad -being cracked or haveing a bad seal in it allowing fuel to leak back in the gas tank, as soon as your fuel pump warms up the leak would expand dropping your power

Posted on Feb 08, 2009

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