My mother's Mystique have a problem since 2 or 3 years for sure. She have a '95 Mystique with the 2.5L ATX and currently have 139 000KM on it.
Well back 3 years, the car always smelled rotted eggs and CEL was on most of the time, in city or on highway, even when drove very gently of very hard. So, we started checking possible causes for that. Since then we checked/replaced them :
- Oxygen sensors (Both changed)
- Plugs and wires (Changed)
- Cat (Checked and OK)
- Intake manifold (Removed and cleaned)
- Injectors (Cleaned by the dealer /w new fuel filter)
The car is serviced every 5 000KM and since a year, we used synthetic oil and premium gas. Premium gas helped a lot and the intake manifold cleaning removed the CEL for good and the rotted eggs odor.
Now, the car have about 80% of his original power, but only when secondaries opens (over 3500 RPM), we can feel we're pushed back in the seat at soon as they open and speed goes up.
But before 3500RPM, it doesn't have any power. I mean, I know that it's running only on 12 valves, but the car doesn't want to accelerate at all if we don't push the accelerator past half. We can feel it struggle, but not that much.
I understand that '95 Duratec are vaccum controled, can it be a broken vaccum line causing this trouble ? If the problem was present all the time, it would be easier to diagnostic, but since it's only when secondaries are closed, I don't think it would be related to fuel or ignition.
Thanks for your help !
