94 rough idle
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Elder User
Joined: Sep 2006
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From: Tulsa, OK
Ok, thanks I now have some new things to try. Yes I did run the diesel kleen through it. Yes it is turbo'd wreckin. It runs better than it did before let me tell ya....LOL But I still have the rough idle, not as rough but it is still there. I still have that miss too. I am going to mess w/it saturday, it is supposed to be nice here. Good day to be tinkering on an old truck!
Thanks everyone.
John
Thanks everyone.
John
Fleet Owner
Joined: Jul 2006
Posts: 20,347
Likes: 803
From: Mi'kma'ki
Cylinder missfire
To detect a missfire, you could slowly loosen each injector line to see if the way the engine is running changes, but an easier method is to disconnect the glow plugs and measure their resistance with the engine running (the glow plugs have to be in good condition). As the engine gets hot, glow plug resistance increases. A cylinder that isn't firing will be colder than one that is. After starting, glow plug resistance usually rises to 15-20 ohms on a operating cylinder, but stays below 10 ohms on a weak one--even lower if the cylinder is dead. If you own an infrared temperature gun, you can detect the missfiring cylinder by measuring exhaust port temp. If the miss cannot be isolated to any cylinder(s), then there may be an injection pump or fuel quality problem.
To detect a missfire, you could slowly loosen each injector line to see if the way the engine is running changes, but an easier method is to disconnect the glow plugs and measure their resistance with the engine running (the glow plugs have to be in good condition). As the engine gets hot, glow plug resistance increases. A cylinder that isn't firing will be colder than one that is. After starting, glow plug resistance usually rises to 15-20 ohms on a operating cylinder, but stays below 10 ohms on a weak one--even lower if the cylinder is dead. If you own an infrared temperature gun, you can detect the missfiring cylinder by measuring exhaust port temp. If the miss cannot be isolated to any cylinder(s), then there may be an injection pump or fuel quality problem.
Ford diesel 6.9 7.3 IDI
ADTMan,
if you have 100k or more on a set of injectors,the problem will probably just get worse.
these ware out,and stop spraying good,resulting in a miss/poor mileage/lose of performance.
if you do find a bad one,and you've got some mileage on them,its a good idea to replace them all so you dont lose your power.
they're quite reasonably priced for our engines,so there's no reason not to keep them changed every 100k on the money imho.
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