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Re: '97 Aero wont start...long post Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Wed, 12 Aug 2009 06:23:40
In Reply to: '97 Aero wont start...long post, aeroblues, Tue, 11 Aug 2009 17:27:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I'm suspecting fuel flow/pressure also. It sounds like you started to lose fuel flow - that would explain why the engine would die out at higher RPM and/or higher boost, both places where you need more fuel. This quickly degraded to the point where the car won't start.
Two ideas come to mind - something has been progressively clogging the fuel filter. Not highly likely, but possible, especially if something got into the fuel, and you've been running at low fuel levels.
The other possibility is the fuel pump assembly. The fuel pump has a short hose that connects it with the output port on the top of the fuel pump assembly. I've seen that hose fail. If it fails, the fuel pump will run just fine, but all it is doing is circulating the fuel in the tank - a gasoline jacuzzi. Depending on how badly that hose has failed, you can still get some flow to the engine, but very low pressure. If the pressure is low, fuel doesn't spray out of the injector - it dribbles. Big, fat dribble drops don't burn - fine, sprayed droplets do. The connecting hose could have a progressive failure like you've seen- the hose starts to crack, so the fuel flow drops as the crack gets bigger.
At low fuel flow, you can get decent pressure, but once the injectors open up, the flow increases and the pressure drops.
The best troubleshooting method would be to open up the fuel rail and do both a fuel pressure and fuel flow measurement. That will require a fuel pressure gauge and care - flying fuel can be exciting.
If you're trying to sneak up on the problem, step 1 is to replace the fuel filter. Can't hurt. Next would be to pull the fuel pump assembly and look. If the hose has split or has fallen off, it'll be obvious.
posted by 192.249.47...
, Wed, 12 Aug 2009 06:23:40 <-- Viewing This Message
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