Question about 2004 Ford F250

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6.0 2004 F-250 was starting hard when cold, replaced glow plugs &harness still starts hard runs rough, glow plug light stays on longer now though

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  • Ford Master
  • 3,103 Answers

Time for replacement of or severe cleaning with fuelinjection cleaner..also if diesel, add cold start to the fuel system..check and replace oil filter type fuel filter since jelling of fuel may be a cold start issue..crack open an injector line and see if injector pump is pushing fuel really well..and see if air cleaner needs replaced blackened element is not good..good luck..

Posted on Jan 19, 2013

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

jonbrown725
  • 73 Answers

SOURCE: 2004 diesel hard to start when cold

It sounds more like the glow plugs, the older models had trouble out of the module, but the 6.0 is pretty safe from all those problems. And don't forget to use the correct fuel additive for diesel engines, it helps .

Posted on Jan 15, 2009

  • 130 Answers

SOURCE: p0301 trouble code

The misfire is detected by the misfire monitor as a slight change in engine speed which the PCM calculates back to a particular cylinder. The monitor is active continuously, but associates problems into 3 types. Two of the types are monitored on successive trips. The first trip the monitor detects a misfire it sets a pending code but not the MIL light. If on the second trip the same problem occurs the DTC code is set as current problem and sets the MIL light on. The MIL will stay on untill the DTC is deleted. The remaining type is a most sever case and signals the possibility of cat damage. In this case the misfire monitor identifies the problem and the PCM determines it to be severe and immediately sets the DTC as current and the MIL light to flash at a rate of 1 per second until the condition is no longer present, at which time the MIL stays on steady.

So once the P0301 is set it never turns off, except by code deletion procedure.

I think a lean burn condition could cause a misfire, but probably not from a PCV problem which should affect all cylinders equally. There would likely need to be another problem with that cylinder or intake or ...... .

Posted on May 02, 2009

pippall
  • 1486 Answers

SOURCE: I have a 1999 Ford F450 super duty diesel. It

Replace the glowplug relay.Its faulty.The glow plugs stay on until engine warms up.The engine temp switch then activates the relay to switch off.So it could be the temp switch also faulty.

Posted on Jul 17, 2009

  • 144 Answers

SOURCE: Ford 150 runs rough when cold

Hi! Either the elbow at back of intake manifold is leaking or your intake gaskets are leaking. A very common occurance on both items and either one will set a lean code and illuminate the check engine light. Hope this info helps!

Posted on Sep 17, 2009

  • 1168 Answers

SOURCE: 91 f150 4.9L no visible timing marks, hard start runs rough.

I have wondered why this happens many times in the past. You would think the marks should line up using #1 cylinder but they don't.
It has been a while but I think if you hook up to #5 ignition wire the marks will come up for you.You will need to undo the "spout" connector before setting it to 10 degrees before top dead center. The spout is a two wire jumper clip that should break out of the harness at the distributor.
Warm the engine up for a while so it doesn't stall as easy while you set the timing.

Posted on Nov 03, 2009

Testimonial: " Right on, timing it on #5 cylinder worked. I thought I probably had a bad damper but it appears o.k. "

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Why does my 2004 (Land cruiser) PRADO 3000 Turbo Diesel 5sp- have issues starting when it's cold? It turns over and over does nothing, then when it starts, I get a big plume of smoke, then it idles rough...


glow plugs are activated if look on the dash when you turn the ignition just before cranking and you should see a light that stays on for several seconds then goes out and then you should crank the engine ! sometimes when its really cold or the glow plugs are worn try turning the ignition on and off each time light goes out 2 or 3 times to get more heat on the plugs then start ! if this doesnt work then glow plus and system needs checking !

Sep 02, 2014 | Cars & Trucks

1 Answer

Why does my rodeo diesel 2.8l 99 model when cold starts at accessories point & glow plug light stays on longer?


sounds as though the cylinder,s etc are a bit clogged up, try some diesel fuel addative,as with all diesel engines if they do not get long and regular journeys the glow plugs,injectors etc get clogged ,as the engine does not get hot enough to burn these deposits off on short stop start types of journey's . you are possibly looking at replacing the glow plugs but give the addative a try and if possible take for a long drive 2-3 hours at steady highish speed , ok to repeat the addative and long drive once more ,if no improvement will need to go into the repair shop to have the glow plugs seen to at the very least , good luck

May 12, 2014 | 1999 Isuzu Rodeo

1 Answer

Having cold start problems 2006 h.d. f350 ,truck is parked in heated garage all night,starts normal in the a.m.,sits outside all day at work,soon as temp falls below 30 F it starts then stalls immediately...


glow pug indicator and glow plug themself are 2 seperate system
test for power at the glow plug harness conector 1 each side over valve cover
test light clamp on batery neg test each wire going to relay for power on both side
then quick check on glow plug end test light clamp on positive test all wires
going to glow pug on each side f this does ligtht up the test light system should be o.k.
for the FICM i have used a hair blower on hi to warm the surface of if to start up a few of
these motors to get them back to the yard for replacment afterward
run a ffeet of these from 250 to 550 lots of problem and work 26 units
good luck

Feb 25, 2011 | 2006 Ford F 350 Super Duty

1 Answer

Isuzu trooper hard to start


  • Even though the glow plug goes out it does not mean the all the glow plugs are working,
  • Remove glow plugs.
  • With a set of jump leads connected to a battery connect the earth lead to the body of the glow plug and touch the top of the glow plug where the wire is connected with the pos lead the top of the glow plug should heat up and turn red.
  • Only replace the ones that do not heat up.
  • Hope that helps.

Aug 03, 2010 | 2000 Isuzu Trooper

2 Answers

7.3 Liter Ford Diesel


check glow plugs wait a little longer beforecranking after light has gone out

Feb 26, 2010 | 1995 Ford F250

1 Answer

88 f250 diesel ticks hard pumps smoke still starts good and no power loss, took vavle cover off and everything looks ok wat should i check next wat would i look for if i was to pull injectors


The problem is the glow plugs are bad or not coming on. Even though the "wait to start" light comes on, the glow plugs may not come on. I have found when this happens, the light comes on for only 1-2 seconds and goes off. With the engine cold, the light should stay on for about 5 to 7 seconds. The colder the engine, the longer the plugs should stay on. There is one glow plug for each cyl. The plugs are in the "V" of the engine and screwed into head. Only one wire goes to the glow plug and the wire runs from one plug to the next on each bank. You test them by removing them and grounding the body and putting 12v positive to the terminal. The tip should glow red hot like a cigarette lighter. There is a glow plug relay behind the air intake horn which also could be the problem and there is a engine temp sensor in the circuit also.

Oct 14, 2009 | 1988 Ford F 250

1 Answer

Glow plugs causing starting problem


if you need connectors and terminals for the glow plug connections under the valve cover, Ford sells then so you don't need a whole $600 harness.

info for your use

Section 03-07B: Glow Plug System 1996 F-250, F-350, F-Super Duty Equipped with 7.3L Diesel Engines Workshop Manual
DESCRIPTION AND OPERATION Glow Plug System The 7.3L diesel engine uses a glow plug system which preheats air in the combustion chamber to improve cold engine starting. The system consists of eight glow plugs, the glow plug control module (12B533), powertrain control module (PCM) (12A650), engine oil temperature (EOT) sensor and barometric pressure sensor (BARO sensor) (12A644). The glow plug system is electronically controlled by the powertrain control module. The powertrain control module energizes the glow plugs immediately after the key is placed in the ON position and then determines how long the glow plugs will be on according to the engine oil temperature and the barometric pressure. The required time for the glow plugs to be energized decreases as the engine oil temperature and barometric pressure increase. The glow plugs are self-regulating, and the powertrain control module controls relay ON time. The powertrain control module protects the glow plugs by energizing them for short durations if the battery voltage is abnormally high.

Possible Causes: Insufficient glow plug ON time will not allow enough heat to accumulate in the combustion chamber to easily facilitate starting. If the glow plug system ON time does not meet any of the specifications in the accompanying chart the problem is most likely a faulty wire harness connection, ground connections or glow plug relay.

If the glow plug resistance to ground is high, the most likely causes are an open UVC (under valve cover) harness or open glow plug.
--------------------------------------------------------
Relay Operation
Install a DVOM on the glow plug feed side of the glow plug relay (large stud with two wires connected). Turn the ignition key to the ON position but do not attempt to start. Note the time in seconds from when the key is turned on and the glow plug relay energizes until the glow plug relay de-energizes. The glow plug relay makes a loud click noise which is easily heard when it energizes and de-energizes. The dome light will dim and the dash voltmeter will dip when the glow plugs are drawing current from the battery. Compare the times measured to the table (time will be affected by engine temperature, battery condition and vehicle altitude). The voltage at the glow plug feed terminal may vary from 9 to 12 volts depending upon battery condition.
--------------------------------------

-----
If battery voltage not present check for B+ at power supply terminal (terminal with single large wire). Power for glow plug power supply is supplied from starter relay through two fusible links at solenoid.
Glow Plug Operation
Disconnect all of the glow plug/injector harness connectors from the valve cover gaskets. With the pigtail installed, measure glow plug resistance to ground (preferably B-). A resistance measurement of .1 to 6 ohms indicates a good glow plug.



Glow Plug Harness Continuity
Measure for continuity from the connector harness to the glow plug feed terminal on the glow plug relay. Resistance should be less than 5 ohms.
Incorrect measurements will result if all glow plug/injector connectors to valve cover are not disconnected.

---------------------------------------------------
Glow Plug Relay The glow plug relay (12A343) has a plastic base and two mounting bolts. It is operated by the powertrain control module (PCM) (12A650) which senses engine oil temperature, PCM voltage and barometric pressure. When the engine oil temperature or the barometric pressure is low, the PCM activates the glow plug relay and the glow plugs. If the PCM voltage is too high, the powertrain control module deactivates the glow plug relay and the glow plugs immediately energize for a shorter duration, decreasing the modulation of the duty cycle.
-----------------------------------------------
Glow Plug Removal
  1. stj~us~en~file=ani_caut.gif~gen~ref.gif WARNING: THE RED-STRIPED WIRING HARNESS CARRIES 115V DC. SEVERE ELECTRICAL SHOCK MAY BE RECEIVED. DO NOT PIERCE.
    Remove valve cover (6582). Refer to Section 03-01D .
  1. Disconnect glow plug electrical connector using a pair of pliers.
  1. Remove glow plug using 10mm socket.
  1. Clean and inspect glow plug tip for damage. Replace if damaged.
Installation
  1. Install glow plug and tighten to 19 Nm (14 lb-ft).
  1. Connect glow plug electrical connector. Make sure glow plug wiring is routed to avoid moving parts.
--------------------------------------------------------------
Glow Plug Control Glow plugs are used to warm the cylinders to improve cold-engine starting. The PCM uses the engine oil temperature (EOT) sensor and barometric pressure (BARO) sensor to determine how long the glow plugs will be on. The PCM energizes the glow plugs longer if the engine is very cold or if the barometric pressure is low at high altitudes.
The PCM controls the relay that supplies power to the glow plugs with the glow plug control (GPC) signal. When the GPC signal is grounded by the PCM the relay closes, turning the glow plugs on.
The glow plugs are controlled by the following sequence:
  1. PCM energizes the glow plugs.
  1. The PCM energizes the glow plugs immediately after the ignition is placed in the ON position.
  1. The PCM then determines how long glow plugs will be on based on EOT sensor and the BARO sensor. The required time to warm up the cylinder decreases the engine oil temperature and barometric pressure increases at low altitudes.
Glow Plug Lamp Control The glow plug lamp (GPL) signal controls the WAIT TO START light located on the instrument panel. This light is used to indicate when to start the engine. The cylinders are being warmed by the glow plugs during and after this light is lit. The PCM energizes the glow plug lamp longer if the engine is very cold or if the barometric pressure is low.
When the GPL signal is brought low, the "Wait to Start" lamp is turned on.
The glow plug lamp is controlled by the following sequence:
  1. PCM lights the WAIT TO START light after a key on reset occurs.
The PCM determines the glow plug lamp activation time based on engine oil temperature, barometric pressure and battery voltage.
  1. PCM turns off the WAIT TO START light.
The glow plug lamp is turned off when the timer counts to the number of seconds specified by the PCM. The glow plugs will normally remain on longer than the "Wait to Start" lamp.
-----------------------------------

Mar 14, 2009 | 2004 Ford F350

1 Answer

I just replaced the glow plug relay dur to hard starting


HAVE YOU REPLACED ALL YOUR GLOW PLUGS RECENTLY? EVEN THOUGH THE GLOW PLUGS APEAR TO BE WORKING I FIND WITH AGE THEY NO LONGER HEAT UP QUICKLY ENOUGH BEFORE CONTROLER TIMES OUT. THEREFOR CREATES A HARD OR NO START CONDITION.

Jan 17, 2009 | 1992 Ford F250

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