Question about Ford F-250

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Glow plug light wont go out

Wait to start light wont go out we start the truck and the light stays on we unplugged the glow plugs light is still on at all times that the key is on we changed the ECM and the glow plug relay we checked power at both ends of the relay we key on next we are changing the ambient temp switch to make sure it wasn't a instrument prob

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  • Ford Master
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Your diesel vehicle is equipped with glow plugs, and also with a Glow Plug Light that will either come on and stay on, or flash or blink when a fault is detected by the ECU (engine management unit). When the Glow Plug Light comes on, the ECU stores information about the condition that has caused it to come on.4 Jan 2016

Is It Safe to Drive With the Glow Plug Light On? ' YourMechanic Advice

https://www.yourmechanic.com/article/is-it-safe-to-drive-with-the-glow-plug-light-on Glow plug light wont go out Google Search

Posted on Oct 25, 2017

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5 Suggested Answers

Anonymous

  • 1 Answer

SOURCE: No glow plug light, car turns over but won't start, no CEL or codes

Very common problem in our shop.  I bet you it is the main power relay located under the dash on the driver's side.  That relay failure is consistent with your symptoms.

Posted on Aug 17, 2008

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Anonymous

  • 1 Answer

SOURCE: 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.

Posted on Feb 10, 2009

Anonymous

  • 21 Answers

SOURCE: 2004 jetta/diesel engine/hard start cold

Have you checked all of your vacuum hoses for leaks? Any vacuum leak, even intake manifold or throttle body gasket, will cause an engine stall right after starting. Likewise with a fuel pressure problem. If you aren't getting voltage, maybe whatever switch starts your glow plug cycle(either turning ignition on or opening driver door, depending on model) is defective, or any of the wiring of the circuit. It's a cheaper guess.

Posted on Feb 26, 2009

steve_e_uk

steve morris

  • 1675 Answers

SOURCE: How do i replace my VW SHARAN 02 glow plug relay.

the glow plug relay is a little black box normally located in the fues box, the relay regulates power to the glow plugs, if the relay is not functioning correctly the plugs will not heat enough or, you will have to allow a longer time to let them heat up, it acts like a switch as such, when you turn on your ignition it switches over to make a contact inside, which inturn starts the heating prosess of the glow plugs when they are at the correct tempreture or the onbored computer detects they are it then switches back , without it , say just using a fuse instead, your glowplugs will just get hotter and hotter till they melted, and no you dont have to change the glow plugs hope this helps, ime not good at explaining stuff in writing lol

Posted on Jan 30, 2010

Testimonial: "Good advice, I understand the concept of what i need to replace, now i can sort the problem out myself. CHEERZ u guys save us ppl money and time. "

csmock132

Clint Smock

  • 4669 Answers

SOURCE: 85 ford 6.9 diesel, the

Have you checked for power on the fuel shut-off solenoid on the injection pump? There are two wires to the pump. One is the fuel shut-off the other is the cold advance. Both should be hot with the key on when the engine is cold. Do you hear the glow plug relay clicking when you turn the key on?

Posted on May 17, 2010

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1992 Ford F350 7.3 Diesel, put in glow plug controller, controller clicks off and on but no power to glow plugs.


Maybe you got a bad glow plug controller ! Did you use a aftermarket part or OEM replacement ?

Dec 31, 2016 | 1992 Ford F350

1 Answer

2004 landcrusier 100 series. glow plug light stays on all the time, although the glow plugs are not being supplied power. starts and runs ok.


THIS COMES ALL FROM "WAIT TO START" DO YOU WAIT TO START? IF NOT,THEN THE GLOW PLUGS ARE BUR'NT OUT,WHICH YOU WILL NOT NEED UNTIL FALL. OR MAYBE YOU'VE GOT IT HOOKED ON EITHER,STARTING FLUID,IN WHICH CASE,I SUGGEST YOU REPLACE THOSE GLOW PLUGS NOW.OR ELSE YOU'RE MOVING ON TO EVEN WORSE ISSUES.LET ME ASK YOU THIS,WHY ARE'NT THE GLOW PLUGS BEING DENIED POWER? AFTER ALL THEY START THE ENGINE? AFTER YOU INSERT THE KEY INTO THE SWITCH,WAIT TO START,LIGHTS UP.IF YOU'VE NOT WAITED UNTIL THAT WAIT TO START LIGHT GOES OFF,,,YOU'VE BURNT THE GLOW PLUGS UP.THE ONLY THING TO DO IS REPLACE THEM ALL.IF YOU'VE BEEN USING STARTING FLUID OR EITHER TO START YOUR ENGINE FOR A LONG PERIOD OF TIME,FORGET REPLACING THE GLOW PLUGS,BECAUSE YOUR ENGINE IS ADDICTED TO THE BOTTLE(EITHER) YOU MAY BE ONE OF THE LUCKY ONES,REPLACING THE GLOW PLUGS MAY RESOLVE YOUR ISSUES.BUT,WAIT TO START,,AIN'T NO JOKE. BEST OF LUCK TO YOU & YOURS!

Apr 08, 2011 | 2004 Toyota Land Cruiser

2 Answers

6.0 diesel will turn over but wont start


is glow plug light on when u turn key to on and go off verry fast see how long stay onplz replay

Nov 02, 2009 | 2004 Ford F350

1 Answer

My 2004 f250 after it sits it wont start. the wait to start light only comes on for bout1 to 2 sec. the only way i start it is to plug it up at night what is my problem.


The wait to start light always comes on for at least 1 sec, if it goes off early it must think the engine is warm.

My guess is you have a faulty engine oil temp sensor that is telling the pcm that it is already warm. The only way to know for sure is to read the info with a scan tool.

Glow Plug System: Description and Operation
GLOW PLUG SYSTEM
The 6.0L diesel engine uses a glow plug system that preheats air in the combustion chamber to improve cold engine starting.
The system consists of:
- glow plugs.
- glow plug control module.
- powertrain control module (PCM).
- engine oil temperature (EOT) sensor.
- barometric pressure sensor (BARO sensor).
The glow plug monitor system is part of the On-Board Diagnostics II (OBD II) System.
The glow plug system is electronically controlled by the powertrain control module. If the oil temperature is below 55°C (131°F) the powertrain
control module will energize the glow plugs immediately after the key is placed in the ON position. Then, depending on the readings from the engine
oil temperature (EOT) sensor and the barometric pressure (BARO) sensor, the powertrain control module determines how long the glow plugs will be
on.
The glow plugs are located in the cylinder heads, under the glow plug buss bar.
The glow plugs are self-regulating. If the engine oil temperature is above 55°C (131°F), the powertrain control module will bulb-check the WAIT TO
START lamp but not energize the glow plug relay.
The glow plug ON time varies from 0-120 seconds depending on battery voltage, engine oil temperature and barometric pressure.
The glow plug control monitor (GPCM) system is designed to find failed glow plugs or failed wiring in the glow plug system.

Oct 30, 2009 | 2004 Ford F250

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

Glow plugs stay and wont shut off


Your problem sounds like the glow plug relay is faulty. It sees to be stuck in the closed position. It is mounted on the fuse board.
John

Feb 21, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

Golf 1.9 tdi match


they are giving you bad advice... that light is basically normal ... your glow plug light... if the motor starts ok ... it's nothing to worry about .... unless i've missed something and you are saying the light stays on... basically with a diesel you turn the key on... wait for the glow plug light to go out ... then start it.

Robert

Jan 24, 2009 | 2003 Volkswagen Golf

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

1 Answer

1989 ford f350 diesel wont start


Bad glow plugs most probably or the glow plug controller. to check your glow plugs remove wire and check with ohm meter to ground. if they are working you should get a low ohm reading if one has a high ohm reading it is bad. if all injectors check good make sure your fuses are ok, also check and see if you hear the controller click when you turn the key to on. Does the wait to start light come on?

Dec 27, 2008 | 2004 Ford F350

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