Hi all,
I have owned a 2000 Ford Focus for about 10 years now.
2 days ago, my wife indicated that the car started stumbling while driving to work. She could barely keep it going, at low RPM's. (Automatic)
I have taken the car for a ride several times since, and have discovered that the problems seem to disappear after about 1/2 throttle and up. That is the car has power and works fine until you let off of the gas. Doesn't matter whether the car is warm or cold.
There are no CEL's, and I have an OBDII reader that can clear codes as well.
In reading some of the threads last night, I replaced the following tonight, in hopes of solving this problem.
1. Replaced Both O2 Sensors
2. Replaced Air Intake Filter
3. Replaced 4 Spark Plugs with Autolite Double Platinum plug
4. Replaced the bad Throttle Body/PCV Hose mentioned in threads on FocalJet
5. Tried the EGR bypass/DPFE thing mentioned on FocalJet (didn't make any difference)
I was praying that the problems would be gone when I started her, but sadly, I could tell right away that they were still there.
Stumbling and idling very poorly, almost stalling.
If you push the throttle down, you usually can clear it and rev it up, after a heavy bog.
I don't know what else to do.
Years ago the Fuel Pump was replaced, under warranty.
It has a full tank of fresh fuel put in it this morning.
I have not checked the fuel filter, is this a symptom of a bad filter?
Please, if anyone has any information that may be helpful, I would love to hear it.