So my ford escort zx2 is dying in idle. I just got a major exhaust problem fixed and that didn't do it. It is throwing a po171 runs lean code. It runs fine over 1000 rpms but dies almost immediately after stopping or going in idle. In park is better, but still tries to die. I have heard everything from MAF, to o2 sensor, to vacuum leak. Which is the cheapest easiest solve, and then move from there.
What is model year? How long since a tune-up?
With idle issues, check and clean idle air system, see if it helps? Use a gage and check proper fuel pressure, key on engine off. On some ford vehicles, with everything off, unplug the maf sensor, where applicable, take the vehicle for a spin, if it does a lot better, have to check the maf system, that includes, sensor--wiring circuits--pcm.
The basics on a rough idle, is to check for a leak of some kind, fuel--egr--vacuum.
Positive fuel trim at low speed and load, the first thing, look for vacuum leak.
SOURCE: 2003 Ford Taurus stalls at idle
go to autozone.com and register for free. You will then have a full free online repair manual with step-by-step directions, diagrams, troubleshooting, testing, replacing, and more. As an automechanic myself, this a wonderful site.
SOURCE: 2003 Ford Escort ZX2 2.0L engine knock and no power.
Get yourself a compression tester and remove all spark plugs and proceed to check the compression for this motor the readings should all be above 110 psi, the car may have jumped a tooth on the timing belt and requires a new belt to be installed.
SOURCE: my 2001 ford escort zx2 has a vacumn leak in the
for sure its the pcv elbows and hose.
you can only get the part from the dealer and they do not sell the elbows seperatly.you will need to get the whole hose.
they are 30 dollars from the dealer .you get the tube with new elbows on both ends.
its on the driver side under the hood and goes under the thermostat housing.
it is very easy to confuse it with the water heater hose.
the pcv tube connects to the pcv valve then routes back to the bottom of the intake tubes.both elbows are heat burt and torn open.
you will have to replace this new part and for sure all your check engine lights will stop as this air is getting by the mass sensor and not accounting for it in the fuel delivery there for showing a lean mix.a vaccum leak will let unaccounted air in the system and the computer will not deliver fuel for this air .not enough fuel is a lean burn.i just did one on this car 2 days ago.take off the intake tubes so you can reach down in there to take off the old .
let me know if it helps.
512 704-6925
joel mitchell
SOURCE: 98 escort ZX2 code P0171. cleaned the MAF sensor
System Too Lean (Bank 1) Symptoms include stalling at idle, rough idle, poor MPG, loss of power, high pitch sucking sound from the engine bay. This is typically caused by a vacuum leak. The most common cause is a hole in the elbow at the PCV valve. It may be hard to see so you'll want to pull it out to check it. Also look at the elbow that connects the PCV hose to the intake manifold. It can get a hole there as well. This is 90% caused by a vacuum leak and not the O2 sensor. Most people (ignorant ones) will just say it is the sensor because it set the code. That code is a good sensor reporting a lean condition. Just replacing the sensor without checking for other problems first would be like replacing an entire wire harness when a light goes out instead of checking the bulb and fuse first. Other causes can be a bad sensor, bad MAF, low fuel pressure, or an exhaust leak. To fix the elbows on the PCV valve you can pick up new ones from the HELP section of the local part store. The part numbers for the elbows from the Help section are:
47028
47029
The one that goes on the intake manifold fits the nipple on the manifold snugly. But, it doesn't fit snug on the line so you'll need to use a clamp on that part. The one on the PCV valve is a very tight fit at both ends. If you don't want to bother trying to rig this up, you can purchase a new line from Ford. The part number is: F8CZ-6853-CA.
SOURCE: 2000 ford escort ZX2 with P0171 trouble code.
I am working on the same problem. This 2000 ZX2 was idling rough and throwing a p171 code (bank 1 too lean). I hooked up a scanner to the OBDII port and you could see the O2 sensor at 0 or very low voltage and not switching and the fuel compensation maxed out which indicates a lean condition. Using a flammable Carb cleaner and the engine running I sprayed around the vacuum hoses until the idle picked up. I found a rubber elbow that connects to the bottom of the intake maniflold and feeds vacuum to the PCV valve. Replacing the the elbow with a suitable replacment from the auto part misc parts cards display had it running smoothly and the O2 sensor switching properly. Since this was happening at idle it was not the fuel filter which can cause a lean condition in upper rpms. It is not the MAF or the O2 sensor since it switches when not at idle. Also check the smaller vacuum lines that go to the evap control from the intake vacuum ports (back of manifold just below the throttlebody, most will be cracking if your car is anything like mine. I have also seen this problem with a bad PCV valve.
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