Poor idle in gear, continued

[Joshua M. Smith]

Originally Posted by jsgold

Berrymans not well know here, but I see NAPA and Advance carry some of it nationwide, so I can get it one way or the other. the question I have is that there is a number of the B12 products according to their website, so, which product are you recommending? I see at least 5 different products that are B12. Also, I saw a method someone listed either here or the S-10 forum that mentioned spraying water into intake while running. Actually a mist from a spray bottle, that was to clean out carbon. Have you used this of Marvel Mystery oils in this way?

Hello,

The second one down, in the cylindrical can: http://www.berrymanproducts.com/Default.aspx?tabid=140



15oz pour in.

Hope the image link works.

Josh <><

[Cailen]

I was speaking with a friend of mine the other day about stuff along this line. I know personally I'm not a fan of these types of products because I ended up blowing a head gasket about a month after using something along these lines for a Trans Am I had.

Our discussion was about using water to do what you guys are talking about. He said that if added when the engine is stone cold water can be completely harmless, and steams away the carbon in there.

What do you guys think of that?

[jsgold]

Someone posted this not too long ago, trying to find it. Seemed to make sense as it basically "steamed" the carbon off. So far I can't find the B12, no one knows what I am asking about at Advance, even though they are listed as a distributor. Our Advance stores here do not stock a heck of a lot. Perhaps NAPA will have it. The valve problem makes some sense to me as the truck has a minor problem with valve seal leakage on startup and has some valve chatter at times. Plus, I saw the paper twice sucked into the pipe. Could not duplicate it last night after the first two times but got dark on me. Will keep on looking into both of these ideas, and have not ruled out the plenum coming off yet. Am getting my work area ready just in case.

[blazee]

Originally Posted by jsgold

Someone posted this not too long ago, trying to find it. Seemed to make sense as it basically "steamed" the carbon off.

http://www.automotiveforums.com/vbul...ht=water+clean

[jsgold]

Thanks. I missed this one. Another person had posted one in which they used a spray bottle. But this would work as well. Might give it a try and see what happens.

[jsgold]

Well I did the water cleaning this morning per Blazer LT post. Some difference noticed as far as performance and a little quieter, but still stalling when idleing in gear for a while. What it was doing today was idleing well when you first stop at a traffic light, say, 10-15 sec, then it would suddenly sputter and try to stall, catch itself and rpms would zoom up then settle back OK for 8-10 sec., then shuts down just like someone turned off ignition. Came home and it stalled as I was stopping to make a turn. It has seemed to stall more when stopping and turning at closed throttle. It will idle all day at 625-650 rpm as long as it is in neutral or park. But in gear or with A/C on it drops to 600 and usually won't run for more than 15-20 sec. at idle. Have been times early in the morning it idles with no problems all the way to work, but that is rare. Does idle smoother it seems. I recall Blazer LT saying his 95 4.3 idled at 700rpm. If mine could idle that speed I bet it would not be stalling. The service manual never says what preffered idle speed IS, only refers to preffered idle speed. Seem to recall it has to idle <800 to avoid transmisson problems. Will be working some more with it Sunday I guess.

[Brian R.]

SeaFoam (NAPA) and GM Top Engine Cleaner (dealer) are two other products that will decarbon your combustion chambers. You use them similarly to that described above.

[jsgold]

Thanks, I was looking at the Seafoam just yesterday but was unsure if it would help. Will pick up a can and try that as well. I cannot find anyone carrying the B-12.

[Brian R.]

Do it as far from civilization as possible. The smoke is really obnoxious. Take it out on the expressway for a while and run it for a while at expressway speeds in a lower gear. Let the engine rev and clean it all out.

[jsgold]

Interesting development this morning, but unsure if it helps a lot. I was testing the truck with my scan tool to d/v voltage and some other things when I noticed the truck had set a code 35.(IAC error). First code I have seen so for except for the system rich caode I got after installing new O2 sensor. Since the IAC is new I doubt if it was bad, but it is a clue anyway. So far this morning the truck is not stalling in gear, but will be driving it to test some more. Brian, which method were you referring to on the Seafoam? Blazer LT's or Josh's?

[Brian R.]

Joshua M. Smith's method. Although I prefer a funnel and pouring it in slowly rather than sucking it in as he suggested.

I don't see any description on how to do it by BlazerLT...

[Cailen]

When's the last time you did a tune up? I can't find that anywhere on this thread. Recommend doing so before you go spraying anything in to the engine.

If you haven't read the stickied tune up thread you should do so. Your problems could be as simple as a clogged $2 pcv valve

[jsgold]

Just did a major tune up withih the last 3 weeks, hoping that would be it. Plugs, wires, cap, rotor button, O2 sensor, fuel filter, air filter, EGR valve cleaning, new EGR gasket, PCV valve, PCV grommet, IAC cleaned, (later replaced, hoping that the idle problem was that), throttle cleaned. I get 20+ mpg combined in town and road, and truck seems to do well except it just seems to shut itself off when idleing in gear for anything over 10-15 sec. Sometimes shuts down when stopping. Today it seems to be idleing a little rougher than yesterday, but, had not shut down after 4 tries. AM getting ready to take it out on the road to try it at normal driving speeds. Maybe the water cleaning broke some carbon loose. Will advise further.

[jsgold]

Frastrating. Runs like a scalded dog on the highway, possibly better than ever, but shut down on me in driveway when i got back. i stopped and let it idle in gear in driveway with scan tool still hooked up and watched. You can feel it while it starts out fine, rpms at 600-625 then boom - it shuts off like someone throwing a switch. I do not see anything on the scan tool that is odd but the IAC counts seem low to me at times. I did notice the voltage on this truck is not what it should be according to service manual. I always thought on a 12 volt system it should be 12-13+, book says 14-15 volts. When the truck was cold it was putting out 14-14.5 volts, with an occasional drop for maybe a sec. to 13.8. When hot it stays at 13.5-13.7. No difference when giving it the gas. I am using my scan tool for this as I have never trusted my POS volt meter in the truck. It shows over 16 volts almost always. Possible problem here perhaps.

[Joshua M. Smith]

You did clean the hole where the IAC goes, right? I use a brush from a gun cleaning kit. These are bronze.

I'm almost wondering if your IAC isn't being restricted somehow.

You're lucky though; my Blimmy's flywheel somehow stripped and I'm out of transportation right now.

Josh <><