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Discussion Starter #1
Hey guys this happened 3 months ago, and honestly i never searched out the answer to it. Ok i got platinum autolites (not double, just single plat) and was going to change my plugs. Nice sunny day, i'm blowing away all dirt from the area/holes before i yank the plugs. At this point i got STP throttle body/intake cleaner to clean the small amount of carbon buildup on the throttle plate...with the tbody still on the engine. Nice an clean, here we go..

I removed the boots slowly and made sure all my wires where in good shape..they where. I replace plug by plug to not mix up firing order/wires. The original motorcraft plugs where brownish...lightly..which i read was good. Now i get everything in, the autolites gapped to EXACTLY what the motorcraft plugs where (.054). I connect everything, and start it up.......

What i get is a jumping idle, from 400-1700 and ALOT of engine noise, the engine was shaking violently and you could see it and feel it physically. It sounded like a drag car, that TU-DA-DU TU-DA-DU sounding idle.. I shut the car after 20-30 seconds, pull the plugs and they are all fine, but have the slightest amount of motor oil on them...really little. I clean them, put them back, and the same thing but less. I shut it off, start her again, and it's gone. Idling nice, everything fine.

Was this because of the stp cleaner seaping into the combustion chamber from the tb..? I'll be honest a good amount got down there when i sprayed it, i'd say a good 1/4 cup. Or maybe i overlooked something and a piece of plastic fell into the spark plug hole...

What happens if something fell into the engine like that, like a little piece of plastic the size of a couple tic-tacs..? Honestly i think a piece did, from part of the vacuum tubing on the drivers side of the intake..alittle tie down thing for a hose, part of it is missing.....till this day i can't find it and it used to be there...YIKES.

PS, after that episode i went to autozone to pick up 8 NEW autolite plat plugs and did another change that day when the car got cold, just to make sure i have good plugs in..this time nothing after i installed them, nice smooth ride. One other funny thing is ever since i put the plugs in, i get some blue smoke...but i heard that was from valve seals...now it seams the blue smoke is gone....weird..
 

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Discussion Starter #2
I do get an occasional back fire if accelerating hard, like if i'm doing 15mph..then floor it sometimes i'll get a THUP noise from the exhaust, and the car will buck for an instant..then take off. I think thats cause i didn't use chevron w/techron for a while though, i used to use that stuff alot.
 

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new wires will solve your problem. i would also take out your newly installed plugs and look at them. i had kind of the same problem but with antifreeze getting into the plugholes due to a stem on the intake that poped loose
 

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Discussion Starter #4
yeah the plugs are good, i checked them about a week ago, they look brand new. The wires are motorcraft 8mm which are about 3 years old (last owner told me when going over engine) as of now. The coil packs are good also.

I'm just worried i dropped a small piece of plastic into the combustion chambor...but wouldn't that just melt and not hurt anything..?
 

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also did you not see the little sticker on your t/b that says DO NOT CLEAN !
 

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Discussion Starter #6
Do Not Clean..? Lol, no i didn't see that...

Are you a pot head focker.....? Lol..
 

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Discussion Starter #8
I can't believe that sh*t...jeez..

Mine DOESN'T have that sticker on it, not even glue like if the sticker ripped off somehow. Ah i don't think it did any harm anyway. "special coating"..lol wtf is that supposed to be, wait a minute let me get my flux capacitor and fill up my tires with dense air,not regular, cause regular is harmful to the coating on the rim..lol.
 

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the stp that you spray cause it and no harm. want to replicate it again, spray it one more time and it'll do it again. it's normal after you spray tb cleaner and first start up.
 

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anyway, you might have water in the gas.....there is a moisture remover you can get a autozone. double check all of the coil pack towers, mine did the same thing, one of the towers went south and i needed new plugs. The car was running on 7 cylinders.
 

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if you have a little piece of anything in your combustion chamber, its gonna fly out the exhaust valve as you crank the engine. prolly before it even fires up, and should do no damage at all.
 

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snow,

I had exactly the same thing happen to me one time when I changed plugs on my '97 4.6L. The problem was that I had knocked one of the fuel injector electrical connectors off without realizing it. Those wires are right above where you are working when you are taking the plug wires out of their holes. If the car is still running badly, check this out!
 

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Discussion Starter #13
Hey thanks alot guys, yeah i checked the fuel injectors/wire clips..all fine.

I'm gonna switch back to what it had stock, motorcraft...when i get the time/ratchet extension.
 

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same exact problem for me, the idle is pretty bad and feels like its gunna die..... right after i changed my old plugs and put autolites in. ill check for the loose injectors wires cause i cant seem to figure out what else it might be
 

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also what could happen if u clean the inside of the TB? i sprayed mine with a ton of cleaner and afterward it started to backfire under heavyaccel and idle rough. problem still hasnyt gone away.....
 

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Guys,

The "do not clean" warning is there because there is a coating on the inside of the TB which is supposed to keep the butterfly from sticking.
 

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I had a problem when changing my plugs also. The plug wires have that great big @ss boot that goes over the plug. When I removed the wires to change the plug, I noticed that the wire had moved up in the boot so far that it didn't engage the plug when pushed all the way into the hole.

Pulled the wires back into the boot so it would engage the plug better (test fit with plug in hand) and have had no problems since.

Hope that helps,
Rob
 

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Would resetting the computer and letting it re-learn the conditions (different spark plugs) help the rough idle?

Just a stab in the dark.
 

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probabbly not. you should however change your plug wires every now and then. the wires will start to breakdown inside and cause the wires to have more restance and not pass the spark as easy. i change my plug wires every other plug change.
 
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