Hard starting floods (UPDATE) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-02-2007, 02:55 PM   #1
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Default Hard starting floods (UPDATE)

1999 Bonneville 170 k
This has happened twice in the last week. After being shut off for several hours the motor starts and kills. I'm sure it'* flooding because of the gray smoke and the smell of gas. The only way I can keep it running is by holding the accelerator to the floor. I was wondering if before I take it into the shop and get the codes run if I should try a used MAF? Any help will be appreciated.
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Old 07-02-2007, 03:34 PM   #2
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Upper intake maybe?

http://www.bonnevilleclub.com/forum/...e=article&k=38

Read this link and see if it applies.
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Old 07-02-2007, 05:01 PM   #3
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The coolant level in the radiator and the reservoir are full
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Old 07-02-2007, 05:18 PM   #4
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Check for fuel in the vacuum line going to the fuel pressure regulator.
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Old 07-02-2007, 05:44 PM   #5
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I checked the vacuum hose on the regulator and it'* dry.
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Old 07-02-2007, 05:49 PM   #6
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When was the last time it had a tune up?

If you have a multimeter you can check the coil resistance.
http://www.bonnevilleclub.com/forum/...e=article&k=33
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Old 07-02-2007, 05:58 PM   #7
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Plugs and wires have 2200 miles on them
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Old 07-02-2007, 08:01 PM   #8
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Rather than a new MAF, I'd attempt to clean the one you have(rubbing alcohol, a q-tipp, and a steady hand. T-25 torx safety bit). How has your gas mileage been(if you keep track). Has it dropped? No change? Can you get the car to run and idle with just a small amount of throttle, or does it have to be WOT? That'* all I have right now.
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Old 07-02-2007, 09:00 PM   #9
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What brand of plugs did you put in?
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Old 07-02-2007, 09:23 PM   #10
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My fuel mileage has been 28-29 Hiway and 18-20 in town. This problem just started about a week ago and has only happened twice, but the gas gage seems to be dropping faster than usuall. When the car starts it will not run for more than a few seconds (at approx 250 rpm) with no or part throttle, I have to put it to the floor and it will gradually come out of it after 5-6 seconds and then it will run fine until it happens again. I put in original equipment AC plugs and wires, also my check engine light is not on. Thanks.
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