Question about 2000 Mercury Sable

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Check engine light is on changed all filters pcv valve and cleaned msd sensor now diagnostics is saying misfiring of 2 and 3 cylinder

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I would try all new plugs and wire first

Posted on Feb 04, 2010

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I have a 2003 mazda 6 2.3 engine has a misfire. could this be an ecm problem?


Have the fuel trims been checked? These (short term fuel trim - STFT and long term fuel trim - LTFT) can be checked with an OBDII tool, and can provide a lot of information about what may be happening. If you have a vacuum leak, for instance, the O2 sensors will report a lean condition to the ECM and it will add fuel to the engine to try to correct. You will see this in the fuel trim numbers.

So, yes, the ECM can cause the misfire, BUT if so, it's because something is not right in the engine. Have a qualified technician evaluate ALL parameters and determine what may be wrong. You've spent a lot of money on parts (O2 sensors, coils, plugs, wires, PCV valve and hose, alternator), and have invested a lot of your time. It's very possible that none, or only a couple, of those parts needed to be replaced. Invest in the expertise of a trained technician.

Nov 14, 2016 | 2003 Mazda 6

3 Answers

What am I doing wrong? Cylinder 2 misfire will not go away. Tried everything. Even stumped a mechanic.


have a compression test done and look for a moving valve seat insert
it gives the knock, misfire
as it is no 2 cylinder it is mechanical because you have moved the injectors and coils , plugs and leads and it stays at no 2 cylinder
If you want clean engine oil then change the synthetic oil out and put in diesel oil 20w40
It will not harm the engine as it is the same as petrol oil but with more additives than petrol oil
it is cheaper and has heavy detergent properties that keeps the engine internals clean
from the gunk in the sump ,it is clear that changing engine oil on a regular basis is something you don't do but if you want a reliable long lasting engine , it is must do number 1

Oct 22, 2015 | Cars & Trucks

1 Answer

2002 Mazda Tribute V6 shaky idle and tugs and pulls at a stop light. It feels like a slight misfire.


Cam sensor. I have had the same problem, we have replaced air intake, crank shaft sensor, fuel injectors, coils, spark plugs, converters, and the cam sensor has seemed to help so far

Jan 30, 2013 | 2002 Mazda Tribute

1 Answer

I have 99 Chevy Malibu. My check engine light came on. The original codes were for a cylinder misfire and a small emissions leak. I replaced the injector for the cylinder that was misfiring as well as all...


well if you get it scanned again, and you get a lean bank 1 and 2 code then you may have a intake manifold gasket thats leaking. I just worked on a van that had them codes. and I ended up changing the intake manifold gaskets to get it to pass the emissions test for inspection, I live in new york state, po171 and p0174 are the lean codes. we did the maf sensor, new 02 sensors, egr valve and still got this lean code. good-day and god blessyou. it was on a 99 ford windstar van.

Oct 03, 2011 | 1999 Chevrolet Malibu

1 Answer

2001 dodge grand caravan sport 3 code 3.3 liter flex fuel random cylinder misfire along with 1 2 5 6 cylinder misfires. scan tools are unable to communicate with computer but check engine light will come...


Dirty fuel injectors. Computer will show misfire on the cylinders that are malfunctioning. If injector cleaner in tank won't clean them, pull them all out and have a professional take them apart and cleaned. Each injector has a screen in it that can get plugged up. Think about Bro, all other stuff has been renewed.

Jul 15, 2017 | 2001 Dodge Grand Caravan

1 Answer

PO300 code. 3.4L 98 Chevy blazer. (random misfire). this happens at high speeds 16000 rpms and higher. after the engine is warm it is more noticeable and misses at idling speeds. if i take it higher than...


A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. it could be any of the following A code P0300 may mean that one or more of the following has happened:
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
  • also
  • Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Jun 08, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

1996 isuzu rodeo keeps reading #2 misfire runs good xcept when cold it hesitates most times or jus occasionally hesitates then the check engine light flashes and its guzzling gas i only got 50 miles on a...


A misfire alarm typically means the coil pack mounted above the sparkplug indicated in the misfire had gone defective.

To test it, swap the coil pack with another cylinder, and see if the misfire goes from #2 to the cylinder you put it on.

If the misfire continues to be on #2, then consider changing the sparkplugs.

I hope this helps.

May 14, 2011 | 1996 Isuzu Rodeo

1 Answer

I HAVE A 2004 ACURA MDX, PUT SCAN TOOLS TO READ CODES. THE CODES ARE ALL CYLINDER MISFIRING DETECTED RANDOM/MULTIPLE CYLINDER MISFIRE...NOW I CHANGED THE SPARK PLUGS, NGK PLATNUM FROM AUTOZONE, CHANGE THE...


Sounds like a bad PCV valve or bad EGR valve. replace the PCV valve ( about $10) locate and watch the EGR valve .. it should move up and down when you rev the engine.. spray the shaft with WD40 if its sluggish or stuck.. it may help.

Jan 06, 2011 | 2004 Acura MDX

1 Answer

1998 Ford Windstar 3.8L ScanTool says that Bank 1 is lean


if your getting oil in the air filter area, you have a leaking intake gasket or a leaking head gasket, run a compression test on it,
if the compression is where it should be on all cylinders then its a leaking intake gasket!!!

Mar 04, 2010 | 1998 Ford Windstar

1 Answer

Check engine light comes on. p0171 and p0351 codes found


From Lusty Kid:

I know the economy is bad, but change all of the plugs. Check your PCV Valve hose, 150 rottens them out allowing air to be sucked in, thus all kinds of codes.

Depending on mileage. Dismount the EGR valve and clean passages. If you are really good dismount the throtle position sensor body and clean out passages with Choke Cleaner., dismount where the EGR valves connects to the engine, clean out passages. Also check the hose thats behind this mounting to ensure is not clogged. If clogged clean it out. If not replace it. Is about 1.5 ft. long, connects to the PCV Valve Hose.

When is the last time you change your harness. Can't remember??? Replace it. Good Luck

Nov 24, 2008 | 2004 Ford F150

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