96 Bonneville hard to start - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-05-2007, 07:14 PM   #1
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Default 96 Bonneville hard to start

Last week I had to install a new fuel pump. Now the engine runs fine however it takes 10-15 seconds of cranking to start. Even restarting takes 2-5 seconds. Any advice?
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Old 04-05-2007, 08:06 PM   #2
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Default Re: 96 Bonneville hard to start

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Originally Posted by hermit4033
Last week I had to install a new fuel pump. Now the engine runs fine however it takes 10-15 seconds of cranking to start. Even restarting takes 2-5 seconds. Any advice?
When you turn the key to "on" do you hear the fuel pump run for 2-3 seconds before turning off? It sounds like you're cranking until the oil pressure builds up which turns the fuel pump on through the other circuit. After starting it restarting would build up oil pressure more quickly.
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Old 04-05-2007, 09:16 PM   #3
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Default 96 Bonneville hard to start

Yes the fuel pump runs for 4-5 seconds when ignition turned on.
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Old 04-05-2007, 09:34 PM   #4
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There'* no cranking until getting enough oil pressure for the car to start. If that were the case..none of our cars would start quickly.

Check the fuel pressure. When you click the key 3-5 times on/off to build the greatest amount of pressure at the rail, it should hold that pressure for a minimum of 10 minutes.

Almost sounds like you don't have pressure to being with... the fuel pump must then catch up to the needs of the car.

What kind of pump did you replace with and why did you have to replace the pump?
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Old 04-05-2007, 09:50 PM   #5
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Default 96 Bonneville hard to start

The old fuel pump was 19PSI and intermittently dropped to less than 8psi. The engine had trouble starting quickly (as it does now). The replacement (ac Delco) has 45psi. I just went and started the car as it has been sitting since last nite. It cranked for 13 seconds and then started right up. I drove for 15 minutes - everything was ok. When I got home I shut the ignition off - waited 10 seconds and started the engine again. It took 5 seconds to start. Up until 8 days ago this engine would start almost within 1 second of turning the key even if the car had been sitting for a week.
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Old 04-05-2007, 10:59 PM   #6
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Old 04-05-2007, 11:15 PM   #7
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*cough* Battery cables. *cough*
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Old 04-06-2007, 12:00 AM   #8
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Quote:
Originally Posted by Bugsi
*cough* Battery cables. *cough*
Yes... Check for corrsion on the cable ends. Check the grounds and be sure to pull back the insulator on the ends to expose more wire and clean the corrosion under that.
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Old 04-06-2007, 08:33 AM   #9
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Fuel pressure...don't crank it over and over. All you are doing is beating your starter.

Quote:
Originally Posted by BillBoost37
Check the fuel pressure. When you click the key 3-5 times on/off to build the greatest amount of pressure at the rail, it should hold that pressure for a minimum of 10 minutes.
With the car OFF put the gauge on..click the key a few time WITHOUT TRYING TO START. Note the pressure number....come back in 10 minutes...is the pressure the same.

I honestly doubt the battery cables are the issue here....afterall..you JUST changed the fuel pump.

And I did over exaggerate some things to push a point. If the fuel pump was the only thing recently replaced..it is the first place to start. As well..the pressure testing you are doing tells you nothing. I've recently replaced a pump or two for the same issues, there is a check valve inside and when they stick open..you have no fuel pressure to start the car.
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Old 04-17-2007, 10:59 AM   #10
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Default 96 bonneville hard to start

Thanks guys. It turned out that the fuel pump was defective. Once it was replaced with a good one the pressure stayed at 44psi when the engine was shut off. I haven't had any problem since. Thanks again.
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