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Sounds like fuel Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Mon, 6 Oct 2008 06:11:20
In Reply to: Re: When it died...., Todd inMA, Mon, 6 Oct 2008 05:10:02 Members do not see ads below this line. - Help Keep This Site Online - Signup |
but you always have to be careful, because some ignition components control fuel. The CPS tells the Trionic to let the fuel pump run.
If the engine started, ran for a second or two, coughed and died, that could be the fuel pump never started, and it ran on residual pressure in the fuel system. It'll do that two or three times before the pressure drops low enough not to start. If it caught and ran for five or six seconds, then the fuel pump was probably running. Again, when you first go to turn the key, the pump will run for a couple of seconds even if the CPS isn't registering.
A few thoughts come to mind-
(1) flaky fuel pump. A common fuel pump failure mode is to develop a dead spot on the pump motor commutator. While running, momentum keeps the motor spinning past the dead spot. But if it shuts down and happens to stop on the dead spot, the motor won't start again. Often it's right near the edge, so a little physical impact moves it over to a good spot on the commutator. So you could have one of those fuel pump motors, and it happened to stop near the dead spot. Each shutdown is the Wheel of Misfortune. If the car doesn't restart, but you have 12 volts on the Fuel Pump fuse when cranking the engine, suspect a bad fuel pump. The downside of this is replacing the fuel pump motor is a little tricky. Not awful, but not a 15 minute job.
(2) tired CPS. The CPS tells the Trionic the engine is spinning and that tells the fuel pump to run, among other useful things (like ignition). If the CPS is intermittent, you could see these issues. Seeing NO voltage on the fuel pump fuse while cranking is one sign of a bad CPS. The good news is that it's relatively easy to replace - it's nicely out in the open. The harness is a bit interesting.
I'd keep monitoring the situation, and keep a meter in the car so you can check the voltage on the fuel pump fuse if it doesn't restart. And keep your AAA membership up to date.
posted by 192.249....
, Sun, 5 Oct 2008 13:45:23, Mon, 6 Oct 2008 06:11:20 <-- Viewing This Message, Tue, 7 Oct 2008 15:17:56, Mon, 6 Oct 2008 17:03:05
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