Reduced Engine Power Pontiac Firebird 2000
Posted 21 October 2011 - 02:41 PM
For the past few weeks the "reduced engine light" has turned on, and my car begins to loose its ability to accelerate. I can probably get it to go about 40 mph (tops), and it take a while of holding down on the peddle to get it this high (acceleration is VERY slow). Sometimes turning the car off and letting it sit for a minute will make the "reduced engine light" go away (although today this didn't work). I took the car to a mechanic and he informed me that the car's fuel pump is starting to go, and the reason it only happens after a while of driving is because it over heats (this seemed odd to me). So after the diagnosis I was able to drive it home (without getting the fuel pump replaced), I decided to call GM and I explained to them my issue and told them what the mechanic had said. Their response was: "That doesn't necessarily mean it's the fuel pump".
Right now I am at a loss, the mechanic said its the fuel pump, GM says it could be something else, and several internet searches bring up a few different reasons. Getting the fuel pump replaced is quite expensive, so I don't want to have to replace it if it is not the issue.
Hopefully someone on here can help give some further insight!
Posted 21 October 2011 - 03:54 PM
Here's a link to more info on this topic.
Posted 21 October 2011 - 06:35 PM
Unfortunately, unless your mechanic carefully reads the computer error codes (if any), it is likely he will automatically replace the throttle body, which is somewhat expensive. The problem is somewhere between, and including, the throttle pedal and the engine throttle body, including all wires and connectors. If it were me, I would start checking the cables, connectors, and throttle sensors first (because they are less expensive).
See this You-tube video for an explanation of one possible fault causing this symptom. It was created for a later model GM truck, but is still somewhat relevant in understanding what is happening.
This post has been edited by GaryDoug: 21 October 2011 - 06:35 PM
Posted 21 October 2011 - 09:08 PM
On the throttle body that is. The one with many many wires on it.
Posted 23 October 2011 - 04:49 AM
Posted 24 October 2011 - 07:46 PM
I took it over to the auto-parts store, and it came up as "Fuel Pump", but while I was there I decided to buy some throttle body cleaner. When I got home I removed the air flow sensor, the whole butterfly valve and engine chamber (I think that's the correct term) was black (probably from a back firing issue I had fixed month or so ago)! I've cleaned it out and am hoping that this was the issue, its about 11:45pm here so I haven't had time to take it out for a test drive but driving around for next few days will help me confirm if this was the issue or not.
Posted 24 October 2011 - 08:03 PM
You may be asking how to replace the pump next ;-)
Posted 24 October 2011 - 08:14 PM
hopefully not, but I'll keep this thread open just in-case ;) (Is it hard?)
Very difficult if you do it the right way. Not so much if you do it the way I did, by cutting a hole in the floor above the tank. Anyway, that's for another day.
Posted 25 October 2011 - 05:14 AM
p.s. I was not replacing the pump, but was investigating an EVAP error code and wanted access to the tank connectors and pressure sensor.
F series hatchback floor cutout sml.jpg (97.99K)
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