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2000 Ford f 150 misfires after worms up

Tuned up put new wires and plugs runs fun in cold miss fire after warm up

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  • Cars & Trucks Expert
  • 259 Answers

How does it start when engine hot ? I would be starting with ect sensor ( engine coolant temp sensor)

Posted on Jan 11, 2013

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6ya6ya
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Posted on Jan 02, 2017

  • 261 Answers

SOURCE: Ford Crown Vic p0300 random cylinder misfire

take a look at the EGR valve it could be either vacum controlled or electronic either way what seems to be the problem is that the valve is stuck in the open position until the engine warms up you can gently tap the egr valve with a small hammer or a screw driver and you can see that it runs smooth, now if the egr valve is vacum controlled replace the valve. if it is electronoc controlled replace the valve and the module for the egr valve.

Posted on Nov 24, 2008

  • 341 Answers

SOURCE: Cylinder 1 and 4 misfire on my 1997 Ford Explorer

The code description is a giveaway.
It could be one of the coils on the coil pack. Most coils nowadays do two cylinders each. This way car makers can get away with one coil for two cylinders.(lowers costs) One spark fires the air fuel mix in one of the cylinders and the other will fire the cylinder on the exhaust stroke. If the coils are removable, and you are fairly handy with cars,switch two around, the problem will follow the bad coil.

Posted on Dec 02, 2008

  • 6982 Answers

SOURCE: 1990 454 mercruiser misfire under load when warmed up

Running on a stand is not the same as running under power...In the water, you are essentially running on a dynomometer (dyno is a big water brake) If you can prove that the module isn't putting in enough advance, it would be doing the same thing that I mentioned with the damper, only for a different reason. So...you're likely on the right track. (rather have a points setup out on the water...anything goes wrong, you fix it without a tow!!!!)
Good luck

Posted on Sep 01, 2009

wracefans24
  • 1985 Answers

SOURCE: 2000 ford super duty 7.3 diesel will not cold start

you need to have the engine coolant switch checked,since the computer relies solely on sensors,the ect tells the computer how cold or hot it is so the computer will make it a rich or lean mixture to start the engine,if it tells the computer that it is 75 degrees the computer will lean the mixture like starting a car in the winter without a choke.

Posted on Jan 06, 2010

  • 1244 Answers

SOURCE: 99 tahoe 350. misfire #3. new cpi unit, plugs,

coil packs? or dist engine? check coil packs for cracks and leakage on distributor egines check for side to side play in the dist shaft if any play then change it!

Posted on Jan 17, 2010

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1 Answer

What is causing my 51reg 1.6 ford focus missfire on engine when engine is warm does not occure when engine is cold?


ISOLATE WHICH ONE IS MISFIRING, THEN CHANGE THE PLUGS ROUND TO SEE IF SAME ONE IS MISS FIRING, IF IT CHANGES TO OTHER ONE WHERE YOU PUT PLUG INTO THEN CHANGE THE PLUG, IT COULD BE A COIL PACK THOUGH. Sorry caps.

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P0300 ford f150


you have a engine miss fire,p0300 is random miss fire if you havent had this vehicle tune up bofore 100,000 good luck,soak them,make sure engine is warm also make sure you blow out each hole that plug goes in first oh and cover your eyes lol!!

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#4 cylinder fouling out


bad fuel injectors or dirty

Apr 16, 2017 | 1999 Chevrolet Silverado 1500

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Code 303 and 304 and check engine light plugs have not been changed 119.000 miles is it tune up time


P0303....Cylinder 3 Misfire Detected

P0304....Cylinder 4 Misfire Detected

sounds like a new set of HT leads and plugs wouldnt go amiss(fire wires) weird name that fire wires HT stands for high tension leads in proper english .

Mar 07, 2011 | Ford F-150 Cars & Trucks

1 Answer

Code says number one cylender miss fireing just did tune up still miss fireing


Depending on your vehicle is the coil pack good? If so with car running unplug the alternator and see if the engine smooths out, if so replace the alternator. The alternator can have a short inside causing a misfire code, if coil pack, wires, and plugs are good.

Feb 13, 2011 | Ford Mustang Cars & Trucks

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My husband did a tune up on my car yesterday and now it wont start it will turn over like it wants to start but it wont he said that its miss firing we have bought 3 new coil packs and still will not start...


If your car is miss firing and your husband changed the coil packs,the wires leading from coil packs to sparkplugs must have got crossed.This will change car timing which will result in the car miss firing.He needs to go over wiring and correct problem for car to run right.You can go online to autozone.com and type in Info about car to get the correct wiring layout.Your problem isnt the new plugs n wires.Its the wiring layout.

Feb 09, 2011 | Pontiac Grand Am Cars & Trucks

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I have a misfire code also, truck misses when cold, generally when it warms up the miss goes away and it runs great. Within the last 2 days once it warms up all of a sudden it will lose power. To the point...


Generally a tune-up is needed when a vehcle is misfiring. Usually the tune-up is the least expensive way to go. It could be the fuel injection or relay, but tune-up is the cheapest way to start.

Nov 28, 2010 | 1999 Ford F350 Regular Cab

2 Answers

I have a miss in my 98 ford f150 the trouble code shows up as misfire #4 and sometimes #5 cylinder what causes this


If it is a 4.2L or a 4.6L , it most likely needs spark plugs and spark plug wires. Please only use Ford spark plugs or it will not fun good after. After market spark plugs do not work too well in a Ford. After market spark plug wires can be used ok. If it is a 5.4L it has Coil On Plug which means each cylinder has its own Coil. If thats the case you may need 2 coils as well as plugs. Hope this helps. Cobra.. :-)

Jun 12, 2010 | 1998 Ford F150 Regular Cab

2 Answers

Have a 2000 ford explorer with a 5.0 V8 in the rain the other day started to skip and it shows cylinders 1 and 6 not firing. |Drove it two hour strait trip day before and it ran great. It ran great until...


It could be the coil, or the ignition module where there coils sit on. Start with the simple and check the spark plug wire first, then work your way to the coils and module. Once you work your way to the coils, try switching the coils around and see if the misfire will switch cylinders which would indicate a bad coil. If the same cylinders are still misfiring after the coils have been switch, then it's a good chance that's it's going to be the wire harness to the ignition module or the module it self. Good luck and hope this helps.

Oct 28, 2009 | 2000 Ford Explorer

3 Answers

Misfires when ran cold


You have low fuel pressure, check fuel filter and fuel pump.

Aug 10, 2009 | 2000 Volkswagen Passat 4Motion

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