Question about 1994 Oldsmobile Bravada

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Starting issue suv will not start has new fuel pump new battery and starter is fine as well as alternator. used crb cleaner and still nothng

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  • Olds156515 May 11, 2010

    Did you replace the whole fuel pump assembly or just the pump and are you sure that the pump is running when you turn the key? You should be able to hear the pump hum when you turn on the key. Also I would check for spark. There is only three major things to have in order for the motor to start. Spark, gas, and air so by eliminating things it will help narrow it down.

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Did you buy the whole fuel pump with the sending unit or did you just buy the pump itself b/c at first i bought a pump and evidently the module on the pump also needs to be replaced so the new pump wasn't holding enough pressure. I would hook up a fuel pressure regulator and see if the pressure gets up to and holds at 40-50 psi. I would also check the spark if the pump checks out as far as pressure goes. Mine was also grounding out on the bottom of the body of the bravada when the pump was up all the way but not when it is down a little, so I would check that as well. I had to use washers to drop the tank down in order for the pump to work. Well, I gave you a list of possible things that may be wrong, so Good Luck!

Posted on Dec 16, 2009

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Hi there,

Here's the deal. If it was the starter then the starter would not turn over the engine when you turn the ignition key - so if the engine is cranking well then that's good and you can forget the starter.

As for the Alternator, as you know, the alternator is a generator that runs off the engine. so when the engine is running you can use that generator to power your electrics and to recharge your battery that has been used to get the engine going in the first place. If the Alternator of the regulator on the alternator (Regulator determines what level of voltage is applied to your electronics circuitry from the generator to prevent over charging the battery and cooking it , and also to prevent having too many volts on your electronic components and blowing something up) but either way the alternator is not used during the engine start up sequence. Until the engine is going you are really only using the battery. So if your battery is really good at the time when your starting you don't have to worry about the Alternator either.

The things that are in play for starting are the starter motor to crank the engine, the timing of the engine set up to ensure the valves are opening and shuting at the right time to let fuel air mixture in and exahust gases out, the Computer system and sensors on the crank and the cam shaft position sensor so the computer can work the fuel injectors, and the spark plugs at the correct time to get the engine going, the fuel pump to ensure you have fuel pressure and the coils to make sure they are generating enough voltage to make the spark jump across the spark plug gap.

If you had to pump the gas last time it may be that the fuel pump is starting to play up , but its a case of working through these components to see what is not happening at the right time.

Do you have any check engine lights on ? that would tell you if the computer is having issues with the sensors. If yes you should go to an Autozone or some where where they offer free On board Diagnostic testing (ODB II checks) to tell you what codes the computer is complaining about at least and that may give you a hint on the road to a fix.

Hope that helps but its definately not the Alternator or starter if the engine turns and if your battery is good.


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