Changed glow plug relay in sunny florida still can start
Changed glow plug relay in sunny florida still can not start 2002 F250 7.3D turns over very fast but will not fire. Ran fine and started great before, had cam sensor updated one year ago. Fuses under steering col. look good.
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Re: changed glow plug relay in sunny florida still can...
Sounds like you have no compression amego 7.3 do that but check the glow plugs with an ohm meter, if the glow plugs to shine it won't run, and whil your at it check your oil level if it's high your fuel pump just craped out.
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Your glow plug relay is located on the top of the engine on the right side toward the front. Some models there are 2 solenoids. A large one toward the front and a smaller one right behind it. The glow plug relay is the smaller one toward the rear. The larger front one is the intkae heater relay. To test the glow plug relay turn engine to on. dont start it. both of the large terminals should have power with key on. then turn engine off. only one large terminal should have power. If when you turn engione to on you only have power on one side then go to this test. Turn engine on and test smaller wire. it should have power. If it does replace the relay. If the smaller wire does not have power you have an ignition problem or power (wiring) problem to the 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
As I understand these systems the ECM is not what powers the glow plug relay. Any kind of engine controls happen after the engine starts.
There should be a power relay which feeds the juice to the glow plug relay. When you turn the keyswitch to start and the light for the glow plugs goes out you should hear a clicking as the glow plug timer cycles juice to the glow plugs.
The glow plug side is a separate system from the fuel management side. Someone should check the glow plugs to see if each is good. The diesel system used to be simple and it sounds like you are complicating what should be a simple repair. I could be wrong, but it does not sound like the Dealer is selling you the parts you need.
A diesel needs a heated combustion chamber to initially fire and then it runs by compression. Perhaps if you change the power relay from the vehicle you removed the ECM from and tried it in your truck it would work with your old ECM.
replace the relay but check connections first as often connection get hot and corroded.failing which buy a push button switch use a relay and and some heavy wire to and from relay to the heaters and work them manually.you could try seperating the relay and cleaning the connections inside.