We were driving and suddenly the car shut off. We pulled over and tried to start it. It would start for a second and die like it wasn't getting fuel. So we towed it home and replaced the fuel pump, filter and relay switch. That didn't work. So we checked for spark we had spark and fuel flow. So then we replaced the camshaft sensor, the maps, the crankshaft position sensor still nothing. We scanned it and we're not getting any diagnostic codes our scanner is working it says we need to check passenger air bag, but that won't cause the car to not start. We know it's something simple and stupid but we can't think of what. We need help.
What makes this problem better or worse?
Nothing
How long has your 2002 GMC Yukon XL 1500 had this problem?
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Hello, the first concern is replacement of all these components without proving any of them to be the root cause of your problem. By doing that, you could possibly have complicated matters, adding more variables to an original problem.
If your diagnostic tool is not communicating, check for a blown fuse in the data link connector circuit. Once you restore communication, you can check for any diagnostic trouble codes, and any key on - engine off data from the engine performance components.
Vehicles need:
Fuel delivery, ignition spark, the right amount of air coming in and exhaust flow leaving the engine.
Along with this, you need to have appropriate ignition timing and engine compression.
Beyond all, ensure you do not have an anti-theft device preventing engine operation.
I reiterate: there is nothing to guess at here; it's essential you follow proper diagnostic steps, or you'll continue dumping money into something without resolve. Seek local professional guidance also for diagnostic help.
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