Hi i have a 2000 Excursion with the 7.3 and i recently had new injectors glow plugs and valve cover wirring harnesses installed. The guy working on my truck calls me and says that only half my glow plugs had been working and he jumped some wires and made them all work. Now that cold weather hits i find out that no glow plugs are working and i start checking other things and my air intake heater isnt working and looks like my fuel heater isnt working as well! What i have found is the wires he jumped was a power wire from the glow plug relays to the ground side of the air intake heater soleniod. So he applied a power to my ground and i figured he burned up the computer cause it will no longer apply ground to that solenoid and im assuming no ground to my glow plug relays also is why there not working. So after a severe RAPING at a ford dealer i have a new pcm and still no glow plugs or air intake heater! Can anyone help? Where do i go from here? What else controlls the grounds to these heaters and relays for the glow plugs? Im at the end of my rope im about ready to just sell this thing but i hate to cause its my favorite truck by far! Any help or sugestions will be greately appreciated!
00EXCURSION7.3
Are you shure that they replaced the valve cover gaskets? Did you get to see the old ones and look at the pins to see if there where any burnt?
Yes they were replaced i supplied all the new parts and saw all the old parts that were removed! Nothing in the old stuff was bad and no burned pins. Only reason i changed all this stuff is i have a small tapping noise in the motor and was told it was a bad injector so i changed all of them and that noise is still there so i have spent a ton of money and only made the truck worse! If i run my own ground wire i can turn the intake heater solenoid on just by applying the ground to it. But the glow plugs i havnt been able to figure out yet! And i dont want to be having to run my own wires to make things work again i just want to hit the key and it start again like it used to!
Well im pretty sure this is the first excursion he has worked on he usually works on buss's that have the international motors in them. The buss's and super duty trucks use the same wirring but the excursion uses its own unique wirring! Instead of using a solenoid like the one for the intake air heater for the glow plugs it has what looks like two relays and he took a power wire from one of the relays to the heater solenoid! and this is when my problems started! The truck allways started perfectly no matter how cold out it was before this was done to it so im about 100% sure that they were all working and now nothing is working! I traced the ground wire from the intake air heater solenoid back to the firewall plug and checked it there to see if it was getting ground when you turn the key on and it is not so there must be something bad but its not the solenoid or the computer so im at a complete loss of where to go next!
The Intake Air Heater being non functional should not cause the problems you are dealing with, I removed mine and put in a fitting for my boost gauge. I'd take it out of the equation by removing it so you can focus on getting the glow plugs to function. I believe RockAuto has them the cheapest and you might be able to find a current coupon code for them 
The Excursions and Cali emmission truck use a Glow Plug Controler, not a glow plug relay.
They are rather problimatic, but it sounds like you took your truck to someone who had no rights in touching it.
I really cant make heads or tails out of your post but it sounds like you put new injectors in it, because it had a "tapping" noise
You installed new Glow Plugs and a new GPC...
The intake air heater has nothing to do with cold starts, it will not help your truck start when cold. It was only added to stop white smoke during extended idle times.
What exactly is the problem, make a list so we can go down it item by item.
They are rather problimatic, but it sounds like you took your truck to someone who had no rights in touching it.
I really cant make heads or tails out of your post but it sounds like you put new injectors in it, because it had a "tapping" noise
You installed new Glow Plugs and a new GPC...
The intake air heater has nothing to do with cold starts, it will not help your truck start when cold. It was only added to stop white smoke during extended idle times.
What exactly is the problem, make a list so we can go down it item by item.
:whs: The intake heater like csi stated is to keep smoke at idle down and for extreme cold temps (I think I remember reading something like -20 degrees or something rediculous) I changed mine cause it was bad and it was the biggest waste of money after doing some research!
The AIH is not causing any of your issues. You want to know what its good for outside of idling your truck for a really long time in the north pole? Blocking off 30% of the air flow. Most of use take it out and plug it with a 5.9 oil pan plug/bolt. Simple. Then take the wires only its wires off the post and ground its done.
From your post you had this guy do:
Injectors
UVC harness
Glow plugs
You do not have a $30 relay you have a $300 control module for the glow plugs unless some how you got lucky.
IF he did put power to the ground he likely killed the those things which were grounded there and both the module and AIH are. But if your truck was starting and running the PCM was likely not damaged but could have been. More than likely the Ford dealer wanted to make a bunch more money off you so you got screwed.
Unless since you had all of this happen the glow plug control module has been replaced. Either by you or ford dealer than that is likely your issue.
FORGET ALL ABOUT THE INTAKE HEATER!!! It has nothing to do with your issues.
Lets go on to this knocking.
All injectors are replaced so that is a done deal. Yet still same knocking.
There are a couple things that I can think of off the top of my head. Air in the fuel system or starvation of number 8 injectors all becasue of the dead head fuel system. This is the cackle you read about. It sounds like someone hitting the head with a ball peen hammer.
They there is a bent push rod. You will here this also thru the exhaust tail pipe.
My suggestion if you can try yourself to isolate it to which side of the engine its coming from. See if you here the sound or miss thru the exhaust pipe.
If you have a socket and screw driver you can replace the glow plug control module yourself. Its very easy. If not it should be a few min job. That should take care of the glow plug issue. If not have a glow plug pulled and tested. The issue when you go putting power to ground is it can burn out all sorts of things. Do not jsut have them ohm it but actually put power to it and see its gets hot.
Until them run a 12 gauge extension cord out and plug your truck in but put a timer on it at the plug and have ti come on about 2 hrs before you need to start up in the morning. That will take care of the glow plug issues.
Anything dealing with that should be over after 5 mins of driving anyways.
The knocking maybe you could describe it in more detail.
From your post you had this guy do:
Injectors
UVC harness
Glow plugs
You do not have a $30 relay you have a $300 control module for the glow plugs unless some how you got lucky.
IF he did put power to the ground he likely killed the those things which were grounded there and both the module and AIH are. But if your truck was starting and running the PCM was likely not damaged but could have been. More than likely the Ford dealer wanted to make a bunch more money off you so you got screwed.
Unless since you had all of this happen the glow plug control module has been replaced. Either by you or ford dealer than that is likely your issue.
FORGET ALL ABOUT THE INTAKE HEATER!!! It has nothing to do with your issues.
Lets go on to this knocking.
All injectors are replaced so that is a done deal. Yet still same knocking.
There are a couple things that I can think of off the top of my head. Air in the fuel system or starvation of number 8 injectors all becasue of the dead head fuel system. This is the cackle you read about. It sounds like someone hitting the head with a ball peen hammer.
They there is a bent push rod. You will here this also thru the exhaust tail pipe.
My suggestion if you can try yourself to isolate it to which side of the engine its coming from. See if you here the sound or miss thru the exhaust pipe.
If you have a socket and screw driver you can replace the glow plug control module yourself. Its very easy. If not it should be a few min job. That should take care of the glow plug issue. If not have a glow plug pulled and tested. The issue when you go putting power to ground is it can burn out all sorts of things. Do not jsut have them ohm it but actually put power to it and see its gets hot.
Until them run a 12 gauge extension cord out and plug your truck in but put a timer on it at the plug and have ti come on about 2 hrs before you need to start up in the morning. That will take care of the glow plug issues.
Anything dealing with that should be over after 5 mins of driving anyways.
The knocking maybe you could describe it in more detail.
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