Question about 1992 Ford F250

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I just replaced the glow plug relay dur to hard starting

Having hard starting problems and the wait to start light is not staying on. Also was hearing a clicking sound. Thought the glow plug relay was bad and when i replaced it the main hot terminal was broken. Put the relay in and same thing wait light not staying on and still hearing the clicking. I theere another relay between that and the ignition?

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  • Anonymous Mar 19, 2014

    Glow plug light stays on and there is a clicking sound in the fuse box

  • Anonymous Mar 20, 2014

    the gglow plug wait light remains on all the time ands I need to know if the relay is bad and what I need to repleace.

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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

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Truck wont start, but only if you hear a click


I copied this from my GM service manual for 1982 6.2 diesel.

1. If the glow plug relay is not clicking on and off then turn the ignition to the RUN position and connect a 12V test light to ground and touch the pink/black wire in the glow plug relay connector.

2. If the light is off repair the open cicuit in the pink/black wire to the splice.If the light is on then touch the light blue at the glow plug relay connector.

3. If the light is off replace the glow plug relay. If the light is on, disconnect the connection at the thermal controller and touch the black wire in the connector.

4. If the light is off, repair the open circuit in the light blue wire from the thermal controller to the glow plug relay. If the light is on repair open circuit in black wire back to a splice. If no trouble is found replace the controller.



You should also get your hands on this Haynes book. Diesel Engine Repair Manual, part # 10330. Excellent coverage on the 6.2 and 6.5. In it, they say that early 82\'s have a hole at the number 2 hole on the pin connector of the wire harness for the thermal controller. this allows dirt in there and corrodes the pins. Remove the connector and clean thoroughly the pin area on the connection and controller. Seal the hole with some silicone. If things are still acting up, replace the wire harness connector.



Hope some of this helps.

Jan 19, 2014 | 1983 GMC C1500

1 Answer

I am having problems with my 1988 ford desisel


the clicking you hear shouldn't happen untill the wait to start light goes off,what you should replace is the glow plug timer,located at the rear of the the manifold under a small vented black box,this needs to stay on for 20-25 seconds in order for the glow plugs to get hot enough for start up

Feb 09, 2013 | 1988 Ford F 250

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

3 Answers

Wait to start light doesn't come on on my 1999 ram diesel it starsts a little hard on cold mornings


The Cummins does not have glow plugs as mentioned above. It has intake heaters. I have a 99 also and it is a cold natured girl on a cold morning. You should have a block heater to plug in when it is below 40 F. The electric plug should be on the passenger side just inside grill on the hood. You can plug it in all night or a couple of hours before you are ready to go and it should help. Also, since your wait to start light is not working, the intake heaters may not be working. Check them out.

Nov 10, 2009 | 1999 Dodge Ram 2500 4WD

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

VW passat glow plug problem


Yes you have a defective glow plug relay if you have your owners manual you can find it and replace it, the unit also has a timer on it, if you don't have a book look for the glow plugs and follow the wires from the glow plugs to where they terminate there you will find the relay unit and replace it, to test the glow plugs you remove the wires and test each plug by pulling off the wire and with a cheep ohm meter touch one end to the glow plug and one end to ground if it swings almost al the way over it is ok, if it dos not move then that glow plug is bad. if you find 2 or more bad then replace them all, and if a glow plug has shorted and caused this problem you will have to replace the glow plug relay. Good luck.

Jun 19, 2009 | 2003 Volkswagen Passat

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.
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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.
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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.

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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.
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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.
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Mar 14, 2009 | 2004 Ford F350

1 Answer

1998 2500 4x4 diesel no start possible glow plugs


sounds like glow plugs how long does the wait to stsrt light stay on . it should stay on for at lest 30sec. the relay is controled by the coolant temp sensor.

Feb 13, 2009 | 1997 Chevrolet C/K 2500

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