300 Missing at idle
Thread Starter
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New User
Joined: May 2008
Posts: 5
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From: North Central Fl.
300 Missing at idle
Hey guys, I'm new here and also new to Ford Trucks. I have always been a Jeep guy.
A few weeks ago I found a really good deal on a 1990 F-150 2wd with a 300 Fuel Injected Straight 6 and 4 speed manual tranny (I LOVE THAT GRANNY 1st!!)
Anyways, the truck runs great and has plenty of power, but when its idling, there is a noticeable miss. (the engine shudders) I replaced the spark plugs (gapped them to specs), distributor cap, rotor, and put new cables. What else can I check?
In my knowledge of Jeeps, the 4.0 inline 6 is very prone to carbon buildup, but that is easily solved by reving the engine to 3500-4000 rpms a few times; you can actually see the stuff shooting out the exhaust pipe. Don't know if the same is true for the ford inline 6.
A few weeks ago I found a really good deal on a 1990 F-150 2wd with a 300 Fuel Injected Straight 6 and 4 speed manual tranny (I LOVE THAT GRANNY 1st!!)
Anyways, the truck runs great and has plenty of power, but when its idling, there is a noticeable miss. (the engine shudders) I replaced the spark plugs (gapped them to specs), distributor cap, rotor, and put new cables. What else can I check?
In my knowledge of Jeeps, the 4.0 inline 6 is very prone to carbon buildup, but that is easily solved by reving the engine to 3500-4000 rpms a few times; you can actually see the stuff shooting out the exhaust pipe. Don't know if the same is true for the ford inline 6.
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
what plugs did you use?
if any brand platinums then that is your problem.
check for the correct ignition wire order, very easy to mess up.
i would not advise revving the heck out of the 300.
welcome to fte.
if any brand platinums then that is your problem.
check for the correct ignition wire order, very easy to mess up.
i would not advise revving the heck out of the 300.
welcome to fte.
Thread Starter
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New User
Joined: May 2008
Posts: 5
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From: North Central Fl.
Used regular Motorcraft plugs -- I never buy into the hype of platinum or double platinum or any of that stuff -- I'm old school! LOL
First thing I re-checked was the ignition wire order, but its on fine. And I do tend to agree with you on revving the engine--somehow it dosen't feel like the 4.0 Jeep when you rev it up.
Any other help would be greatly appreciated.
First thing I re-checked was the ignition wire order, but its on fine. And I do tend to agree with you on revving the engine--somehow it dosen't feel like the 4.0 Jeep when you rev it up.
Any other help would be greatly appreciated.
Thread Starter
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New User
Joined: May 2008
Posts: 5
Likes: 0
From: North Central Fl.
Sorry, I meant ignition wires. I also put a new air filter in it. Next I'm going to grab a spray bottle and spray some water in the throttle body to see if that loosens up some carbon deposits.
Thread Starter
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New User
Joined: May 2008
Posts: 5
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From: North Central Fl.
Allright, I'm gonna take off the throttle body and nail it with CRC. I have always heard to stay away from seafoam -- Do the ford trucks like it?
I have had jeeps all my life, so I know them inside and out, as well as all the tricks, so I figured that an I6 ford would behave the same as a 4.0 Jeep engine -- guess not.
I have had jeeps all my life, so I know them inside and out, as well as all the tricks, so I figured that an I6 ford would behave the same as a 4.0 Jeep engine -- guess not.
