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My ford f150 4.6 starts missing as it gets warm.ive changed o2 sensors still the same

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Mitsubishi diamante 2003, changed two o2 sensors, still hesitates at start specially when warm


there should be 4 sensors in the system two are normal O2 sensors that are located after the cat converter and two are heated sensors HO2S sensors located before the cat converter. Use the special sensor removal/installer tool so that the wires are not damaged . If you only replace d 2 sensors then you may have missed the faulty unit. The check engine light will stay on until you reset it with a scanner

Apr 05, 2014 | 2003 Mitsubishi Diamante

1 Answer

I have a 2006 Freestar with a 3.9 Engine . When it is cold it has a miss when i step on it. But it gets better when it starts to warm up. Almost seems like a spark plug miss


Spark Plugs ---change at 70,000 miles
O2 Sensors--change at 100,000 miles (front 2 only)
Gas Filter--every 3 years/30,000 miles
Air Filter ---every 3 years/blow off once every year
MAF Sensor---Clean once a year or more often

Ignition Coils--- most definitely will go bad,at
least 1 a year. (Any Check Lights or Codes ? )

When cold, it isn't in closed-loop, and runs on
Long Term Fuel Trim--not on O2 Sensors ,until
warm

Let it warm up at least 4 minutes in cold weather,
go light on the gas for first 2 miles

Feb 22, 2011 | 2006 Ford Freestar

1 Answer

I have 99 deville,about a month ago it started missing and backfiring,it starts good and runs fine in park,as soon as u put it gear and give it some gas it chugs and misses.ive had hooked up to three...


Firstly, It might be an Idea, only, that you could change the O2 Sensor...Only an idea right now.
You could also have a look at this site I found..
http://www.audizine.com/forum/showthread.php/391877-P0300-Multiple-misfire-P1128-Upstream-Heated-o2-sensor-swapped-(Pending)
I had similar problems with my Jag Xk8, also could not be fixed....Had all sensor's change and is still working fine...
Hope this helps..

Oct 22, 2010 | 1999 Cadillac DeVille

2 Answers

I have a 1998 Ford Expedition 5.4l, engine has an intermitent miss-fire and hesitation after reaching operating temperture. I have no CEL or stored codes. This problem is much worse when the A/C is on. I...


Your good
I would still remember, that all ford COP Coils have issues,from 1998 thru today
The Coolant Temp Sensor, should put it into closed loop, after it warms up---then the O2 Sensors can do their thing. That's one item
O2 Sensors slow to swing--maybe,need to test
Converter partially blocked-a bit of a stretch, but don't rule out.
I would buy one new coil, and walk it down from cyl to cyl,tough on that engine,but I put my money there

Oct 02, 2010 | 1998 Ford Expedition

1 Answer

O2 sensor replacement


It's easier to change when the exsaust is warm. Start the truck and let it idle for a few minutes. You can use adjustable wrench or the actual O2 sensor removing socket to remove it! Be careful NOT to burn yourself!

May 23, 2008 | 1998 Ford Explorer

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