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why wont my 2004 grand prix start unless i press gas pedal? sometime it start with pressing it but it sound like it about shut off or idle to high

By: Guest
Date: Mon-May-12-2014-
Response
1
You need to scan the OBD2 bus and read if there are any error codes. If not, fuel pressure may be an issue. Normally, the fuel system is primed by turning key from off to on, waiting a few seconds that fuel pump should run for short time, computers boot up, and then turning key to start. 
[d] By: mortgaging
Date: Tue-May-13-2014
Response
1
Chances are that you have a vacuum leak somewhere that is leaning out the engine. 
By pressing down on the pedal, essentially you are fooling the computer into "thinking" that 
you are driving at a higher speed (requires more fuel) so, it increases the amount of fuel going in and it starts. That will also cause a high or poor idle. 
If you can't find a leak by just a visual inspection, try putting one end of a short length of hose to your ear and moving the other end along any vacuum lines, fittings and manifold/block connection while it's running. It looks silly when you do it, but it works. 
And yes... There are other things that can cause your problem, but simple leaks are the best place to start testing. 
[d] By: imperfection
Date: Tue-May-13-2014
Response
What is 1 + 100



Helpfulbox Now Offers Free POS Software

for restaurants, kiosk, and any other retails business completely free. It can be used as windows cashier system or as full blown POS. You will able to print to kitchen, display orders on the kitchen screen, manage inventory, employee, report, customer loyalty offers, employee management, delivery address track and much more, all for free.

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