Viper slow engine speed decrease to idle problem, need help?

I

ILLYamaRider

New member
Joined
Mar 22, 2005
Messages
25
Age
43
Location
Illinois
I recently cleaned the carbs of my Viper after I got it out of storage the engine seems to have a problem where it will not drop the engine speed directly bad to low idle. After reving the engine, it will hang at about 4000 to 3900 rpm for about 5 to 10 seconds before it will finally drop bad down to low idle. Does anyone have a suggestion for what might be causing this? I have attempted to adjust the air-idle screw to the factory 1 7/8 turns from bottom, but that didn't help. Can the air-idle screw be turned too far past the "soft stop" and into a "hard stop," causing a problem? I turned the air-idle screw in far enough that the point of the screw comes into the "barrel" of the carb, which I am calling the bottom of that adjustment. Any suggestions would be appreciated. Thanks.
 
maxdlx said:
2 turns out
Click to expand...

yep, and its not an air screw, its a fuel screw. by turning the screw out to 2 turns like maxdlx suggested, you are adding more fuel on the bottom, to cure the lean condition that is currently there, which is what is causing the rpm hang up.
 
mopar1rules said:
yep, and its not an air screw, its a fuel screw. by turning the screw out to 2 turns like maxdlx suggested, you are adding more fuel on the bottom, to cure the lean condition that is currently there, which is what is causing the rpm hang up.
Click to expand...

Ok, I get the 2 turns out, but I am would like to ensure that I am starting from the correct "bottom." When I first bottomed the screw there was a "soft" bottom, but I continued to turn the screw past (it turned, but it was a little hard) until now the point of the screw stops, and protrudes out of the hole in the carb. I have tried running from 2 turns out of that position. Did I screw something up by turning the screw in to far?
 
just turn em down snug then back off,the tip sticking into the barral is norm,but it sounds like you tryed 2 out already?
 
Yeah, I just talked with a dealer service shop, and they suggested that it is still running lean possibly because one of the pilot jets are still plugged, or there is an air leak in the intake. Sounded like I am "barking up the wrong tree" with the fuel screw.
 
I will have to check for sure, but I have not changed them, and I got the sled with only about 500 miles on it, so hopefully they were not changed. I got it from a guy in Minnesota, and I normally ride in the Northwoods of Wisconsin, so I can't see why they would have been changed.
 
I would think they would be stock still,boy it seems funny you have this issue,usally 2 out helps,are you sure you have no othere air leaks and carbs are clean?

Try this...if no other air leaks do 2 1/4 out but..... usally i recomend anything over 2 and id jump up to the next size PJ then back to stock turns.

thry that.....
 
I am going to double check/reclean the carbs to ensure that they are good and clean, and make sure that there aren't any other air leaks (which I couldn't see why there would be)......if I had an air leak anyone have a suggestion for where to check? The carbs fit will to the engine, and the boots from the airbox also fit well. Can the carb have an air leak somewhere I might have missed?
 
No like a crank seal leak or carb boot to case leak etc.etc...set idle then to 15-1700 try that, lower the better but maintain a good idle.
 
You must log in or register to reply here.


Back
Top