Low idle and stalling problem

[jgfurr]

My 94 is stalling and cutting out when I slow down for stop lights. I found an old "Stump the gurus" post related to this:
http://vca1.viperclub.org/ubb/Forum20/HTML/000022.html#2

After the car warms up, the idle appears to be low (under 500 rpms). Prior to warming up, it idles just above 500. After warming, about 20% of the time when I slow or stop, the tach will drop all the way to 0 and the car stalls. If I turn the ignition switch off and back on, the car will start just fine (still idles low). It does not matter if the air conditioning is on or off, the problem still occurs. I have noticed that I can pretty much eliminate the stalling by not down-shifting when I slow down. If I just push the clutch in with the rpms above 1500 and slow down with the car in neutral, it will drop to idle (under 500) but not all the way down and stall.

I replaced the spark plugs, spark plug wires, synchronized the throttle cables (several times), made sure the hose running from the left valve cover was solidly connected to the air box, and made sure the wiring cable on the right side of the air box was solidly connected. None of this fixed the problem. Where is the idle speed motor?

I will say that I didn't have this problem until I got on it from 1st through 3rd a couple weeks ago. Any more suggestions? HELP!

 

[JimDavis MT 97GTS 650R]

If your battery is 3 years old or more,or your battery is in marginal condition, expect the idle to take a dump. Trust me on this one. If the battery is fairly new, load test it at a battery shop to make sure it is OK. If the battery is fairly old, replace it. A tired battery can cause all kinds of running problems.

 

[Viper Wizard]

At this point I don't think I can give you an answer for this problem over the site. "FastFreddie" is right your going to have to get to a Viper Tech/Dealership and plug in with a DRB and see whats going on. Resetting may do it or he/she Tech may find a fault in your Viper.
The answer is out there! Good Luck!

 

[Qualitywires.com]

I would say it's your Idle control valve. it gets carbon build in it and prevents it from idling correctly. I used some carb cleaner and it did the trick. took about 15 mins to do it. My ICV is located by the front passenger throtttle bodies. it's at an angle with a connector on it.

 

[phiebert]

I'm pretty sure I know your problem. I know you said you re-sync'd the throttles but you gave away the key when you said you "got on it" a few weeks ago and that's when the problem happened.

No one, even Viper Techs, have re-sync a Viper's throttle bodies more than I have!!! It was getting ridiculous because my ratchets were worn I guess. Every time I stepped on it they needed resyncing again. And I had exactly the same problem you have with stalling when they are out of sync. If mine are out of sync and I go down a long hill with the clutch out, I could guarantee it will stall if I put the clutch in without giving it a little gas (just like downshifting when you slow down, same issue).

The key to the fix for me was to do the resync as per the instructions on this site but don't ignore the final suggestion about clamping those %$@#$^#$ ratchets down by putting a bolt into them.

I'll bet that is your problem, you "clicked" your left side throttle ratchet when you stepped on it and now the right leaves at the same time or earlier than the left.

If that isn't the problem then I think someone else suggested to me that I may have an air intake leak somewhere, but mine was the syncing issue.