96 Bonneville hard to start
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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?
#2
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Re: 96 Bonneville hard to start
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?
#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?
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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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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Originally Posted by Bugsi
*cough* Battery cables. *cough*
#9
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Fuel pressure...don't crank it over and over. All you are doing is beating your starter.
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.
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.
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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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.