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Re: 93 9000 Aero Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Sun, 31 Aug 2008 09:44:17
In Reply to: 93 9000 Aero, Dee, Sun, 31 Aug 2008 07:49:17 Members do not see ads below this line. - Help Keep This Site Online - Signup |
To recap - the engine died. You could get it to restart, but it would die right away. This worked a few times, and now it won't catch at all - starter just spins.
The problem is likely the fuel pump or fuel pump relay. Since you've got spark, you've got the CPS, so the ECU knows the fuel pump is running. Since you've got spark, the ignition switch is OK, because the power for the fuel pump/ECU is on the same bus as the DI.
If you spray some carb cleaner (like Gumout) into the intake and crank the engine, does it catch, maybe run a second or two, then die? If so, it's a fuel issue.
If you have a voltmeter, measure the voltage on the fuel pump fuse. Most fuses have a little slot on the back that you can stick a meter probe onto. Crank the engine - do you get 12 volts (or so?) If so, the fuel pump relay is OK, and everything driving it is OK. If you get 0 volts (or 2 or 3 volts), I'd suspect the fuel pump relay.
If you get 12 volts, jumper the fuel pump fuse to the Hazard flasher fuse (22). Keep the key Off. Do you hear the fuel pump run? If you do, the fuel pump is running (Yes, I know, sounds silly - stay with me on this). If you don't hear the fuel pump run, you've got a bad fuel pump. Nothing special about the Hazard flasher fuse, other than it has power all the time so it's an easy way to get power to the fuel pump with the engine off.
If you hear the fuel pump run, crank the engine for 5-10 seconds, then pull a spark plug. Does it smell of fuel? (Probably not).
Basically, if the fuel pump doesn't run and you have 12 volts at the fuse, the fuel pump is most likely bad. It could be a bad connection at the pump, but most likely the pump MOTOR is bad.
If you hear the pump run, but the engine doesn't run and the spark plugs are dry, then the pump is bad, but in a different way. The fuel pump consists of an electric motor driving a pump inside the fuel tank. Part of this assembly has a short hose that connects the pump to the top of the assembly, and the fuel then goes to the outside world. If the motor is bad, nothing spins, and no fuel flows. If that hose fails or falls off - remember, all of this is inside the fuel tank - then when the pump runs, it just circulates the fuel inside the tank - it doesn't make it to the outside world and the engine. Not common, but I've seen it a few times.
What's the difference? In both cases, the fuel pump assembly has to be pulled. But if the motor is bad, you need to replace the motor - some places will just replace the entire assembly, which is much more expensive than the motor. However, if the hose just fell off, you can pull the assembly, fix the hose, and go back. Somewhat cheaper.
However, if you've got 100K miles on the fuel pump or so, I'd just plan on replacing it.
posted by 76.196.10...
, Sun, 31 Aug 2008 09:44:17 <-- Viewing This Message, Sun, 31 Aug 2008 16:27:50, Mon, 1 Sep 2008 14:46:17
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