Engine was dieseling, added 2-stroke oil

[BostonWagoneer]

When the weather is cold, which is has been a lot lately, my Waggy 360 will diesel for a little bit (chugga chugga) after I turn the key off.

Because there has been a lot of talk on here about adding 2-stroke oil or Marvel Mystery Oil to the gas tank as an upper cylinder lubricant and combustion chamber cleaner.

Today I bought a pint of Valvoline (my favorite brand) 2-stroke motorcycle oil. I had about a half-tank left in the Waggy. I added 1/4 of the pint (4 ounces or so) to the tank then went and filled the tank. I drove home (about 7 miles), and the engine still dieseled when I shut the key. OK, that seemed normal.

I have also been having a high-idle problem. I have the idle screw on the throttle linkage backed all the way off, and I made sure that the fast-idle solenoid is backed off far enough that when it is not engaged, it does not apply any pressure to the linkage. The engine still idles high. I tinked with this a little bit when I got home.

So this evening, I drove to pick up my girlfriend and then drove around a little bit. The dieseling problem is usually more prominant when the engine has been on for some miles and is nice and hot inside. I turned the engine off about 30 miles later.

No dieseling. Sweet! We drove back to her place and when I shut the engine off, no dieseling. I was at her place for about an hour and I drove home 7 miles to my place. When I shut the engine off, no dieseling.

Not only did the dieseling disappear, but there isn't any hint of a chugga chugga to be found. Clean and easy, the engine just shuts right off. I'm pleased.

Now I just need to adjust the mixture screws tomorrow to see if that helps my high-idle.

[reddog]

If your talking about the 88' then the idle solenoid and your dieseling problem are likely related. The solenoid is used so that the carb butterflys shut totally when you shut the engine off to avoid dieseling. It is not a high idle solenoid, it is what sets the idle when the key is on and the solenoid is energized. Make sure the idle is set correctly and nothing is holding the butterflys open when the key is off.

Kerry

[BostonWagoneer]

This is on the 82. Thanks for the tip. Maybe my fiddling with the solenoid fixed the dieseling and it wasn't the oil...

[Bob Barry]

I find my GW diesels as soon as the winter-blend fuels start flowing out the pump. Come springtime, and no more dieseling. I don't think the 2-cycle oil was the cure.

[andy d]

run on needs 2 things, an open throttle plate, and carbon or something in the chamber that is staying hot. a stuck choke will cause it.the wrong plugs will too. messing with the throttle positioner prolly helped you. BTW, does the winter blend of gas smell worse than usual this yr?

[talntar]

yea the last tank i put in smells awfull when running

[BostonWagoneer]

I'm glad I don't have to pass emissions! :D

[PlumCrazyChris]

What will remove the carbon or whatever buildup in the chamber that is staying hot?

[Don S]

Originally posted by PlumCrazyChris:
What will remove the carbon or whatever buildup in the chamber that is staying hot?..Here’s a link to the gentle way I have been doing it in my FSJ for 18 years.
link> CARBON & FUEL ADDITIVES (http://groups.msn.com/JEEPTECH101/jeeptech.msnw)
… works for me…
Good luck and http://www.michiganjeepers.com/forums/images/graemlins/wave.gif and Happy Holidays … CUL.. ds..
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It’s taken me over 261 Colorado Mountain Passes since 1985-
BRC#30093 link> Blue Ribbon Coalition JOIN and save your TRAIL (http://www.sharetrails.org/)
http://www.fullsizejeeps.com/jeeps/files/1963-1983-Wagoneers/76401.s.jpg ALL American Pure Cast Iron
link> 2003 OURAY FSJ Invasion Info and High Altitude Tips (http://groups.msn.com/ATexasOklahomaJeepClub/ouraycotopic.msnw)
link> Acronym and Abbreviations for 4x4 Gearheads (http://groups.msn.com/NISSAN4X4TRAILS/acronymlist.msnw)

[BostonWagoneer]

Run the engine with the idle a little bit high and SLOWLY pour about a pint of water into the mouth of the carb. Use one of those sport-mouth bottles so that you dont put too much in, or you can use an old Windex bottle.

Make sure not to put so much water that the engine stalls. If the engine sounds like it might start to stall, pop the throttle linkage a little to give it more gas or just stop pouring the water. If the engine does stall DO NOT POUR MORE WATER IN.

I've done this on my YJ 258 several times. It seems to help a bit. I'll probably give that a try on the Wag soon.

There are products available from dealers and parts stores that claim to be combustion chamber cleaners, but water is a lot cheaper and is the main ingredient in those products anyway. If you want, you can add a little (one cap-full) of ammonia to a pint of water.