rough idle - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-28-2006, 10:56 PM   #11
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Quote:
Originally Posted by BillBoost37
Jack.. that'* waht I call a carboned up sensor.. wow.. Did you clean the IAC passage as well?

Yes, cleaned the whole freaking throttle body too after I took out the IAC and MAF to clean them.
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Old 09-28-2006, 11:53 PM   #12
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I'll hope for a smoother idle after this weekend. Hopefully I won't have to replace any parts besides the gasket.
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Old 09-29-2006, 08:56 AM   #13
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Pete...I find it usually takes 2-3 cans of TB cleaner and an old toothbrush depending on how bad they are.
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Old 09-29-2006, 10:47 AM   #14
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Quote:
Originally Posted by DrewB
I put the Chinese water torture and Seafoam treatement to my 92 with 165k miles. Idle smoothed right up and gas milage went up considerably. For those who are not aware this is a GM approved technique for removing carbon from the upper engine. It can solve the rough idle which remains even after you have done all of the other high milage maintenance. I can post a link elaborating on the technique if interested.
Hi is there any way that you could send me a detailed link to using the seafoam, i have head good things about it, but never used it becuase i was confused, on the can it says to add to the oil, gas tank, or injectors. i didnt think that it was good for a car to put anything but oil type substances in the oil, this seafoam seems like a water type liquid, so i stayed away from it thinking it would mess my car up, also, if i wanted to put in with the fuel, how in the world do i put it thru the injectors, i know that if you do it one way it will make your car smoke,, thats the end result that i am trying to reach, i hear that is the best fuel cleaning method, so if there is some type of link that goes into detail for all of us
"slow" people lol that would be great,, thanks alot,, Jayson
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Old 09-29-2006, 12:03 PM   #15
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bunny... slow down a minute. I saw your other post and you will want to approach one thing at a time before introducing new variables.
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Old 09-29-2006, 02:19 PM   #16
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Quote:
Originally Posted by bunnyswan1994
Hi is there any way that you could send me a detailed link to using the seafoam, i have head good things about it, but never used it becuase i was confused, on the can it says to add to the oil, gas tank, or injectors. i didnt think that it was good for a car to put anything but oil type substances in the oil, this seafoam seems like a water type liquid, so i stayed away from it thinking it would mess my car up, also, if i wanted to put in with the fuel, how in the world do i put it thru the injectors, i know that if you do it one way it will make your car smoke,, thats the end result that i am trying to reach, i hear that is the best fuel cleaning method, so if there is some type of link that goes into detail for all of us
"slow" people lol that would be great,, thanks alot,, Jayson
You can do the Chinese water torture/Seafoam treatment anytime during the engine maintenance process. Just be sure to do it all; TB, plugs, sensors and their connections, etc. Here is the description of the process I sent to the moderator.

Please note that you can get the Fire department called on you doing this. It has happened!

Here is the technique:

Engine should be fully warmed up.
Connect an 18" vacuum hose from a vacuum port above the throttle. I used the one going to the charcoal canister.
Take a jar (normal size mayo or spaghetti sauce jar) filled with (distilled)water (this would be just under 4 cups)
One hand holding throttle open so engine remains in the 3 to 4 thousand rpm range.
Dipping hose in water over and over approximately once a second for about 1/2 (0.5) second or less, less often if engine slows significantly, engine will run rough so use throttle to maintain engine speed until all the water is gone which will take only a couple of minutes more or less.
Repeat with the 16 oz can of Sea Foam Carbon Cleaner (SF16, UPC#: 1881200001) (or GM Top End Cleaner).
Remain alert and focused and just donít let the hose stay in the water/fluid for much more than half a second at a time and you should be safe. You know you are feeding in too much fluid if the engine speed drops signifaicanly even though you are trying to maintain it with the throttle. Be prepared to see a lot of smoke from the exhaust and from the exhaust manifold. This is normal.
It is best to let the car stall while sucking in the last amount of cleaner. Let the car sit for about 15 min. and then take her for a high rev drive. Put her in 2nd and get the RPM'* up around 3500 to 4000. Drive around until there is no more smoke or about 15 min.

This procedure will not harm the Cat, O2 sersor or any other components. It can be done at anytime. I have not seen it but GM does have a version of this procedure as well as the carbon cleaner.
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Old 09-29-2006, 03:13 PM   #17
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Quote:
Originally Posted by BillBoost37
Pete...I find it usually takes 2-3 cans of TB cleaner and an old toothbrush depending on how bad they are.
2-3 cans eh? I have about 1 full can now. I'll be picking up a lot of stuff at Advance tonight, I'll add a can or two more to the list.
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Old 09-29-2006, 03:30 PM   #18
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Took me 3 cans to do a decent job on two N* TB'*.. and they are much eaiser than ours.
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Old 09-29-2006, 04:16 PM   #19
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Quote:
Originally Posted by BillBoost37
bunny... slow down a minute. I saw your other post and you will want to approach one thing at a time before introducing new variables.


Lol sorry about all that.. its just that im almost at witts end after doing almost 1200.00 worth of wk to it, and seeing pretty much no change in the cars performance, or the way it runs
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Old 09-29-2006, 06:12 PM   #20
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Lol sorry about all that.. its just that im almost at witts end after doing almost 1200.00 worth of wk to it, and seeing pretty much no change in the cars performance, or the way it runs
It'* no problem. You've come to the right place and we'll help you figure it out. This is what we do..and we do it all day, every day.
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