Question about 2003 GMC Safari

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Van will not start I have fuel pressure and when cranking it builds oil pressure where do i go from here

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Check for spark at the spark plugs. If no spark, remove distributor cap and inspect the inside of the cap and the rotor for obvious signs of wear or damage. Check for spark at the coil wire by removing the coil wire from the center of the distibutor cap, and, holding the end of it close to the engine block, have someone crank the engine. There should be a very strong spark. If there was spark at the coil but not at the plugs, replace the distributor cap and rotor. If there is no spark at the coil, you either have no power or ground at the coil, or the coil is bad. With the ignition ON, there should be 12v at the red wire for the ignition coil. if not, check the fuses. Check for the pulsing ground signal of the ignition coil at the other wire ( I think a white wire) using a test light clipped to battery + while the engine is being cranked. If there is no light, the problem is likely the ignition module or pick-up coil, which is located in the distributor. Make sure that the wiring and connections are in good shape for these items before condemning them.
Pick-up coil should have about 1500 ω of resistance.
Good Luck

Posted on Sep 30, 2009


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Hello George.

When starting up your pickup the computer activates the fuel pump relay as long as it is cranking.
When the engine starts it builds up oil pressure. This pressure activates a switch that applies 12VDC to the fuel pump.
So regardless of oil pressure it should fire up when cranking and then shut off momentarily after if no oil pressure develops.
This should address your question.

Basic diagnostics are needed here George. Check fuel pressure and ignition to begin and then home in on the problem.
Unfortunately I could not begin to hazard a guess at this point what it is as it could be anything.

Thank you for using FixYa.


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