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Why do i hear my fuel pump on a 2004 pontiac bonneville whining up and down?
Walt, You will hear the fuel pump at times. When you take the gas cap off the fuel tank is acting somewhat as an echo chamber that is amplifying the noise of the fuel pump. Presumably the engine is ticking over when you remove the gas cap? Otherwise the fuel pump should not be running.
The fuel pump only supplies fuel on demand - obviously. The pump will run to pressurise the system to meet demand and if that demand for fuel fluctuates, the pump will run down or increase speed accordingly. This speeding up and running down of the pump is constant.
If by 'a miss' you mean that the fuel pump goes quiet for a second or so - that's normal. No demand for fuel - the pump doesn't run. That wouldn't effect the engine at tickover.
If the 'miss' is from the engine at tickover that's more than likely to be a plug.
If your car runs okay at speed and doesn't cut out and then will restart almost immediately, it sounds as though your fuel pump is okay.
on Mar 21, 2016
How do I no if i have a bad coil on my 2004
if you have multiple coils then there will be a regular misfire on a particular cylinder. If you have sets of coils then the coil that handles a set of plugs will misfire on those plugs. If you have one coil to do the lot then indicators are engine will not start, coil lead will show a weak orange spark when sparked to metal, engine will start fine and run for a period of time before the coil overheats and starts to break down ( misfiring), coil is very hot to the touch (burning ) after minutes of operation.
on Nov 14, 2014
Install three back spark plugs 2004 pontiac bonneville
there is a tool that replaces the dog bone upper motor mount that allows you to roll the engine forward which tilts the engine to give you more access to the rear plugs. you can also remove the upper mount and using a large bar roll the motor forward and block into place will do the same.
on Oct 14, 2014
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