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Ford f-150 5.4 liter cold start problem.

After sitting all night when you try to start, it starts on one or two cly's runs like that for 2to3 sec's then all 8 work. runs good down the road and idles good.

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  • Ford Master
  • 3,852 Answers

Get a Mode $06 scan performed when cold to identify exactly which cylinders are misfiring. Then narrow it down to either plugs or coils

Posted on Oct 10, 2019

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6ya6ya
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Posted on Jan 02, 2017

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emissionwiz
  • 85206 Answers

SOURCE: rough idling and poor fuel economy on 92ford f-150

This whole problem is most likey due to a sludged up intake and idle speed control valve, do the following procedure and it should take care of the problems, also run a couple of cans of LUCUS brand fuel injector cleaner through, I know u will see it is more expensive than other brands, but the thing is it works!
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Posted on Mar 13, 2009

  • 532 Answers

SOURCE: 2001 ford 4.6 liter idles rough sometimes dies

may need 1 0r more coil packs replaced,or it could be what happened to my 2000 4.6---1 lifter expanded out and wouldnt collapse,causing the rocker arm to fall out of place and the valve could never open...try unplugging 1 coil pack at a time while running and listen for a change in the way it runs,if there isnt a change then its probably a bad coil pack,find a cylinder that runs and swap the coil packs,if no difference then its probably the valve staying shut.

Posted on Nov 22, 2009

sscullys
  • 984 Answers

SOURCE: I have a 2004 ford f-150 off road 5.4 liter. My

If this is a 2004 Heritage ( old body style ) and the transfer case is known to lock in ( check with truck jacked up, shift into 4WD and try to turn front drive shaft ), the next item to look at is the vacuum disconnect motor for the front axle. This is on the front axle, and will move when shifted into 4WD
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It is item #10, on this parts diagram
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If you do not have movement in this, check the vacuum lines with a vacuum pressure gauge, to see if vacuum is being applied ( Pink line is 2WD w/ vacuum is operation, Blue line is 4WD w/ vacuum operation ). If no vacuum at the lines, check them back to the vacuum shift solenoids
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Posted on Jan 04, 2010

  • 90 Answers

SOURCE: p0102 code on 1996 f-150 302 replaced MAF will not

maf senser a tps senser are linked ,by they both sense the load on the engine ,one does it throttle opening and the other by air density u may check the tps and also for excessive air leaks around induction system

Posted on Feb 21, 2010

  • 632 Answers

SOURCE: my 98 jetta 2.0 will not hold idle by itself until

Try replacing your Engine Coolant Temp Sensor, it's cheap and easy to replace. Just remember do it when the coolant is cool to work with before you start cracking a pressurized system.

Posted on Mar 05, 2010

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