Sputtering bad
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5th Wheeling
Joined: Aug 2010
Posts: 28
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From: Goodspring
Sputtering bad
Ok guys, I have a 2000 f-250 super duty 6.8L 316000 miles, possibly clogged injector(s), I have just recently replaced all the coil packs and plugs (went with iridium) ran great for several months, bout a month ago it started to get a lil bit of a miss but not bad, it has progressively gotten worse, it’s to the point now that if I’m going at a steady speed n OD and give it gas to speed up or pass it’ll bog, drop outta OD and pick up, all the coil packs and plugs check good, I bought an injector cleaning canister and ran 3 cans of Pro Klean Injector cleaner through the fuel rail, making sure to pull the plug to the inertia switch so the fuel pump is outta the equation, still having a lot of sputtering, what would b the easiest way to check each injector for function/clogging?
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
First off I always use oem motorcraft plugs. I tried bosch plugs once and the truck didn't like them. That was years ago. Do you think its missing on a cyl? You can start it and check the exhaust manifold for equal heat after 20 secs of running or so..each cyl.
You can unplug each injector one at a time to get a feel for the drop to compare each cyl...you could pull coil connector also.
Describe sputtering.
You can unplug each injector one at a time to get a feel for the drop to compare each cyl...you could pull coil connector also.
Describe sputtering.
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5th Wheeling
Joined: Aug 2010
Posts: 28
Likes: 0
From: Goodspring
Thx for the reply, the sputtering is not all the time, I can b driving along at normal speed and everything is smooth but if I start up the least bit of incline and need a bit more throttle it starts to “shudder” but if I give it more gas pedal, requiring the tranny to downshift, it’ll smooth out, also, if I try to accelerate aggressively from a stop it’ll really shudder but stop shuddering if I back off the throttle, it doesn’t seem to b a plug or coil, oh, and I forgot to mention I also cleaned the MAF sensor, and to answer the question of unplugging each injector one at a time, it’s hard to tell a difference when u have 10 cylinders going
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Hate to say it but I would put oem plugs in it. and make sure it has ford coils. The symptoms could lead to either having an issue. Common to show up when you need a little more power...I had bad coils doing just that.
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5th Wheeling
Joined: Aug 2010
Posts: 28
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From: Goodspring
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New User
Joined: Aug 2019
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Did you get this figured out?
Mines doing the exact thing. Only going up hill/ under load. Thinking pump/ regulator? Haven't thought about plugs and coils only because it seems fine at idle. Let me know what u find out! Thanks!!
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New User
Joined: Aug 2019
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Think I’m going to do plugs, coils, pump and regulator, clean MAF, and see where I’m at next week. Hope your issue gets resolved!
Fleet Mechanic
Joined: Oct 2017
Posts: 1,704
Likes: 164
From: Southwest Ohio
What do you mean by “pump”? You are going to replace the fuel pump? What fuel pressure did you measure at the fuel rail? How did you deduce that both the fuel pump and the regulator were faulty? Or are you hoping that throwing parts at a problem eventually leads to a fix?
If you take your time and do the correct diagnostics, you will spend less money and less of your valuable time on fixing the problem.
— Dave
If you take your time and do the correct diagnostics, you will spend less money and less of your valuable time on fixing the problem.
— Dave
New User
Joined: Aug 2019
Posts: 11
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Trucks new to me. Doesn’t hurt to have new plugs and Coil packs, don’t know much about the history, other then it’s from a small town with only one gas station. Hoping my issue resolves with plugs and coils, otherwise will have my mechanic test fuel system, I got a feeling it’s the fuel pump/ regulator as the filter was nasty and seems worse when tank is half full or under. Thanks for your reply Dave. Any advice, I’m happy to hear it.
* had the truck 2 days with no service records or history
* just had a baby and don’t have a lot of time
* had the truck 2 days with no service records or history
* just had a baby and don’t have a lot of time
What do you mean by “pump”? You are going to replace the fuel pump? What fuel pressure did you measure at the fuel rail? How did you deduce that both the fuel pump and the regulator were faulty? Or are you hoping that throwing parts at a problem eventually leads to a fix?
If you take your time and do the correct diagnostics, you will spend less money and less of your valuable time on fixing the problem.
— Dave
If you take your time and do the correct diagnostics, you will spend less money and less of your valuable time on fixing the problem.
— Dave
Thread Starter
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5th Wheeling
Joined: Aug 2010
Posts: 28
Likes: 0
From: Goodspring
Ok, so pretty much all I accomplished is add more to my Amazon card balance!!!!! 10 new motorcraft plugs, 10 new motorcraft coils, took it to the end of the road (bout 1.5 miles) did awesome, ran like it did when it only had 200,000 miles, coming bk, different story, now it misses at idle like it has a cam?!?!?
New User
Joined: Aug 2019
Posts: 11
Likes: 0
Ok, so pretty much all I accomplished is add more to my Amazon card balance!!!!! 10 new motorcraft plugs, 10 new motorcraft coils, took it to the end of the road (bout 1.5 miles) did awesome, ran like it did when it only had 200,000 miles, coming bk, different story, now it misses at idle like it has a cam?!?!?
