My car wont start, why
If it cranks normally, it is obviously not the starter relay; if it were the relay the starter would not operate. To begin with, when the vehicle is not starting you are going to have to determine whether it is losing spark, fuel pressure, fuel injector pulse, or some combination of these things.
You can check for spark by removing the coil assembly, plugging 4 known good spark plugs into the plug connectors and laying the plugs agaiinst the metal engine. Then have someone crank the engine over while you watch under the hood to see if the plug is firing.
To check for fuel pressure, you will need a fuel pressure gauge, connecting the fuel pressure gauge to the fuel rail test port, you can measure the pressure in the fuel system when the problem is occurring.
To check for injector pulse, you will need a logic probe or a noid light to check for injector signal (fuel pulse) at the injector electrical connector.
In order to begin diagnosis, you need to check these three things to determine what system the fault is in. Once this is determined, pinpoint testing down to the component level can be performed.
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Nov 15, 2011 |
2001 Pontiac Grand Am SE