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Old 01-20-2021, 06:55 PM   #18
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 44,703
 

2003 L-Series 3.0L Sedan
Default Re: 2003 ION Stalls at Stop....Now Dangerous to Drive

In my previous post, #10, I mentioned a possible fuel issue.

With 230k miles, everything is out of warranty and failure of long life parts have to be considered. No one can expect a fuel pump to last forever since its on while the engine's running. A dead pump is relatively easy to diagnose but an intermittent one may be more difficult. There are several ways to determine an intermittent pump and requires a simple 12v test light and fuel pressure gauge (connected at all times). A test light with long wires, one wire connected to the pump relay terminal 30 or 87, one wire to ground with the light inside the car. A fuel pressure gauge can monitor pressure while driving or parked.

At ignition ON time, fuel pressure should be around 40 psi, same with engine running, Engine shutdown should display pressure for at least a few minutes before pressure bleeds off. With am erratic pump, pressures may fluctuate at any time and drop off almost immediately when the engine dies at random. The test light will turn off when the engine stops but can help visualize power being applied to the pump and/or if the pump is intermittently failing.

Unless you guarantee zero issues with a 230k mile fuel pump, it would be wise to borrow a fuel pressure gauge from AutoZone or Advance Auto and check it. You may have to leave it connected so the next random engine die off, check for pressure, at engine die off time and on restarting.
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