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Old 03-05-2019, 01:28 AM   #3
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,271
 

2003 L-Series 3.0L Sedan
Default Re: Okay, Iím stumped.

Bypassing the fuel pump relay to get the pump running only gets fuel pressure to the injectors.

1-Are injectors operating?

2-Is spark generated on every plug?

Unless you remove coil packs and spark plugs to check for fuel, our engines are difficult to test for spark and injector operation. A simple method to test for both - spray starting fluid into throttle body and try starting. Artificially supplying fuel thru the throttle body while starting now counts on the ignition system to supply spark to ignite and run the engine briefly (presuming a fuel issue is the problem). If the engine won't startup then the ignition system, crank sensor and ecm are suspect. From here, troubleshooting becomes a little more complicated.

3-Do you see engine rpm on the tach when starting? There should be rpm indications while starting (250-500 rpm?).

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