Question about 2002 Mercury Mountaineer
There is an intermittent miss at idle in a drive gear, when running at steady speeds below 60, and under light to moderate acceleration. The check engine light is on, it flashes sometime under moderate acceleration but has no miss at all under hard acceleration or speeds above 60-65. It has had a heal-a-coil installed on 1 cylinder and the problem was apparent after that. My daughter had the vehicle when the plug blew out and it was driven for a short time after until she brought it home with the "Dad, it's broke" thing. The wires and coils were installed new, new PCV valve, and the Mass Airflow sensor was cleaned with a cleaner designed for that application. I believe it to be some sort of electrical problem or possibly the speed sensor on the drivetrain? The stereo system/clock shorted out but I do not remember if it did before or after this problem. AND, I forgot to mention, if I remove the ground cable for a few minutes the check engine light stays off long enough to drive 15 miles or so with a VERY slight miss the, when it comes back on, it's back to the same.
If the ck engine light comes on it should give you code which cyl in causing the problem could be a plug wire or coil
Posted on Nov 10, 2014
You need to hook up a computer scanner to the engine to find out what the fault code is [indication of what is causing the miss]. The CHECK ENGINE lamp lights up when a fault code is detected and set in the computer's memory. ALWAYS replace all the spark plugs on a Ford when there is a miss. Those "alleged" 100,000 mile spark plugs are really only good for about 60,000 to 65,000 miles. Using them longer than 60,000 miles causes the ignition coils to overheat [from trying to fire the huge gaps on those worn out spark plugs] & fail. Hopefully, you will get a fault code to tell you which cylinder is the problem. When you disconnect the battery, you give the PCM [engine computer] a case of amnesia, and it forgets the fault codes it has stored in it's memory. That's a foolish move, as it only removes the info a "real" mechanic needs to solve the problem. Use only Motorcraft, NGK or Denso spark plugs. Other brands won't last in a Ford product.
Posted on Nov 09, 2014
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Posted on Jan 02, 2017
U can go to any autozone, kragen or other chain auto parts stores and they will run the trouble code test for free, let me know what they find if anything, this also may be a fuel pressure problem
Posted on Mar 09, 2009
You describe this as an acceleration problem however, if the car does throw a check engine light it should be recorded in system memory so it can be pulled by scanning with and OBDII scanner. It sounds as if the car is being starved for fuel on acceleration. Check the fuel lines for kinks as well as check the fuel pressure. The problem could be a faulty fuel pump that has yet to completely die.
Posted on May 21, 2009
There are many possibilities on this. Anything from bad Gas, Bad Ignition Wires, Bad Distributor/IgnitionCoil, Intake Air Leaks, Bad Sensors etc.
It sounds like a malfunctioning Idle Air Control Valve. You can take this off and clean it with Carb Cleaner. Reinstall and check operation. If it helps but does not solve completely the problem: Replace this.
Check your Ignition Wires and Distributor/Ignition Coil.
The Idle Control Valve is available at
(no-I don't work for either store/company)
Autozone Part #TV281 for around $51.
Advance Auto Part #50523 for around $52.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!
Posted on Feb 17, 2010
See if you can get the codes. If it is still number 4 only (probably a P0304) it could be the fuel flow through injector 4. Try some Techron cleaner and make sure number 4 plug isn't fouled. Also get the compression checked on number 4.
If not, it could be the ignition control module assuming all other changes have been made. If you get a code it will help. A P0300 would point toward the ICM. If it is number 4 only it could still be the ICM. Expect around $150 for the module if you do it yourself. The ICM may be under the coil pack. If you are getting a P1361 and/or P1362 it could be the Cam position sensor. They are around $40 and are usually near the number one cylinder. Mine is hiding under the water pump pulley. It is a Buick with the 3.8 engine but the principal is the same.
Posted on Mar 14, 2010
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For idle issue,click the help links provided below :---
Bad miss at idle? http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html---------- Engine stumbles coming off idle when warm?
While stop engine idles like cylinder missing?
Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?
High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
Erratic idle on car?
Low idle when cold out side?
Idle Air Control (IAC) Valve Replacing?
intermittent engine failure while idle?
Engine quits at idle?
Car overheats and Air blows hot at idle? http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
not starting or turning over indicates towards multiple possibilities. It can
be issue with battery or weak battery. But if battery checks out ok, then it
can be starter issue or faulty alternator or problem with low fuel pressure or
no spark at spark plugs due to dirty spark plugs or faulty ignition
coil or injectors getting cracked or dirty and needs to be cleaned.
confirm the problem, the basic troubleshooting is required.
this link below and follow the troubleshooting:------
This will help.
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Aug 14, 2017 | 2002 Mercury Mountaineer
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