Bad Injector?
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Junior User
Joined: Jan 2013
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Bad Injector?
Ok, guys, it's been a while since I've posted on here, but I finally had my truck looked at by an actual Ford diesel mechanic. I put on a new oil filter, and did my own oil change (Rotella 15w40), we started it up with it hooked up to his computer, and noticed that it was burning a decent amount of oil. At that same time, a misfire or something showed up in cylinder number 5. So, he was thinking that it could be a bad o-ring, bad injector, or in the worse case scenario, a hole somewhere causing the oil to leak into the fuel system? I got ahold of another mechanic who said that he was pretty positive that it was a bad injector on cylinder 5. Have any of you guys ever had this problem, and what were the symptoms you had? It's causing mine to have a delay in the start/hard start depending on temperatures outside. Do you guys think I should just go ahead and buy a new injector, and have it put in, or should I sell the truck? I'd love to get it fixed up, because it's a 99 and has a lot of potential. If you need more info just go ahead and ask me.
Cargo Master
Joined: Jan 2009
Posts: 2,800
Likes: 31
From: OKC, OK
Ok, guys, it's been a while since I've posted on here, but I finally had my truck looked at by an actual Ford diesel mechanic. I put on a new oil filter, and did my own oil change (Rotella 15w40), we started it up with it hooked up to his computer, and noticed that it was burning a decent amount of oil. At that same time, a misfire or something showed up in cylinder number 5. So, he was thinking that it could be a bad o-ring, bad injector, or in the worse case scenario, a hole somewhere causing the oil to leak into the fuel system? I got ahold of another mechanic who said that he was pretty positive that it was a bad injector on cylinder 5. Have any of you guys ever had this problem, and what were the symptoms you had? It's causing mine to have a delay in the start/hard start depending on temperatures outside. Do you guys think I should just go ahead and buy a new injector, and have it put in, or should I sell the truck? I'd love to get it fixed up, because it's a 99 and has a lot of potential. If you need more info just go ahead and ask me.
Lot of testing needed before replacing that stick.
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Junior User
Joined: Jan 2013
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No need to sell it. Did the mechanic do a buzz test? Did he do a CCT test. Did he look at rotational velocities? Those wont absolutely diagnose a bad injector but they can get you close . Bad o ring would allow fuel to mix into your coolant that you would se in the degas bottle. Have you done the 50cent mod?
Lot of testing needed before replacing that stick.
Lot of testing needed before replacing that stick.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
There are too many possibilities without popping the top and inspecting parts. I had a loose #8 injector once that was making 6 and 1 look bad on the breakout box test. A tired O-ring will fit everything you describe, but so would a loose injector hold-down bolt... or a combination of the two... or a loose connector... or, or, or.....
When I had injector problems, I ultimately pulled them out and inspected everything. I knew pulling them would render the O-rings useless, so I ordered new O-rings from Riffraff Diesel before I started my work and the new O-rings solved some problems. The holes need to be cleaned out before putting the sticks back in because I found O-ring residue stuck to the walls.
If you hire a mechanic to do your repair work, it can get costly to "hunt and peck" at a problem like this. If your truck has over 200K miles, it's about due for the whole batch of injectors to be replaced and it's far cheaper to do this just once. So... there is nothing on the market today that matches the simpler and more durable engine that is the 7.3L, but it could be due for some maintenance. What would you replace your 99 with that would spare you the possible expense of updating your truck?
When I had injector problems, I ultimately pulled them out and inspected everything. I knew pulling them would render the O-rings useless, so I ordered new O-rings from Riffraff Diesel before I started my work and the new O-rings solved some problems. The holes need to be cleaned out before putting the sticks back in because I found O-ring residue stuck to the walls.
If you hire a mechanic to do your repair work, it can get costly to "hunt and peck" at a problem like this. If your truck has over 200K miles, it's about due for the whole batch of injectors to be replaced and it's far cheaper to do this just once. So... there is nothing on the market today that matches the simpler and more durable engine that is the 7.3L, but it could be due for some maintenance. What would you replace your 99 with that would spare you the possible expense of updating your truck?
Thread Starter
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Junior User
Joined: Jan 2013
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There are too many possibilities without popping the top and inspecting parts. I had a loose #8 injector once that was making 6 and 1 look bad on the breakout box test. A tired O-ring will fit everything you describe, but so would a loose injector hold-down bolt... or a combination of the two... or a loose connector... or, or, or.....
When I had injector problems, I ultimately pulled them out and inspected everything. I knew pulling them would render the O-rings useless, so I ordered new O-rings from Riffraff Diesel before I started my work and the new O-rings solved some problems. The holes need to be cleaned out before putting the sticks back in because I found O-ring residue stuck to the walls.
If you hire a mechanic to do your repair work, it can get costly to "hunt and peck" at a problem like this. If your truck has over 200K miles, it's about due for the whole batch of injectors to be replaced and it's far cheaper to do this just once. So... there is nothing on the market today that matches the simpler and more durable engine that is the 7.3L, but it could be due for some maintenance. What would you replace your 99 with that would spare you the possible expense of updating your truck?
When I had injector problems, I ultimately pulled them out and inspected everything. I knew pulling them would render the O-rings useless, so I ordered new O-rings from Riffraff Diesel before I started my work and the new O-rings solved some problems. The holes need to be cleaned out before putting the sticks back in because I found O-ring residue stuck to the walls.
If you hire a mechanic to do your repair work, it can get costly to "hunt and peck" at a problem like this. If your truck has over 200K miles, it's about due for the whole batch of injectors to be replaced and it's far cheaper to do this just once. So... there is nothing on the market today that matches the simpler and more durable engine that is the 7.3L, but it could be due for some maintenance. What would you replace your 99 with that would spare you the possible expense of updating your truck?
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Thread Starter
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Junior User
Joined: Jan 2013
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Rebuild, is what I was told. The guy who had the truck is a mechanic, and had it rebuilt with stronger internals.
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Elder User
Joined: Jul 2012
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From: Glen Rose, Texas
Your told? That leaves a lot of things up in the air on what it could be. I dont have experience on this subject, but put where you live, rough location works, and there maybe somewhere near you with an AE that can point you in a better direction. These guys are very giving on here when it comes to helping another out. Good luck.
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Thread Starter
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Junior User
Joined: Jan 2013
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Truck has 250k
Fleet Mechanic
Joined: Apr 2011
Posts: 1,441
Likes: 6
From: Marseilles IL
As Tugly said already, 200k+ miles is an average time to need new injectors. If those are the original injectors, I would replace them all. Your motor was rebuilt at 210k, most likely your injectors are original unless they were damaged by the original motor failing.
Thread Starter
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Junior User
Joined: Jan 2013
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As Tugly said already, 200k+ miles is an average time to need new injectors. If those are the original injectors, I would replace them all. Your motor was rebuilt at 210k, most likely your injectors are original unless they were damaged by the original motor failing.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
So... you just want to get this running good enough to put on CL? Do you have a need for a bad-*** diesel, but maintaining it is too costly? Did this look appealing and you really like it, but you don't have the resources or the need for such a beast? Am I warm on any of these? This is not prying, this is my style of trying to learn what you really want to do about the truck and there are plenty of good people here to offer up useful input. Our input will be based on your true motivation.
Cargo Master
Joined: Jan 2009
Posts: 2,800
Likes: 31
From: OKC, OK
I live in OKC I think I am the only one with AE around here.
If you want we can try to meet sometime to.check it out.
Maybe these guys will make a list of stuff to loom at so I don't miss anything.
If you want we can try to meet sometime to.check it out.
Maybe these guys will make a list of stuff to loom at so I don't miss anything.