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Extremely high idle after battery disconect

B

BlueCuda

NAXJA Forum User
Location
Tulsa OK
Hey Everyone,

Yesterday I unhooked my battery becuase I had some welding to do. When I hooked back up and started the jeep it went to idling at 3000RPM. WTF? I unhooked and waited about 10 minutes and tried again..same thing. I ended up pulling all 3 connectors off of the PCM and waiting a few minutes. Put them back on and all is good. Any ideas?
 
Normally the OBDII systems need to 'relearn' their parameters after a disconnect. Recommended is to take it for a ride as it relearns.
 
Whats funny is I have had the battery disconnected 10x in the last 2 weeks I bet for various reasons. Never once had it done this, just making sure it wasn't a precurser to something else going down the drain lol.

All it takes is a wingnut to disconnect the negative cable so why not? Better safe than sorry. Of course if it does this crap from now on I will stop doing it :D.
 
I have an 99 XJ we put a header on it know it revs so high and fast we have to turn it off any sugestions??
 
we checked everything I had the same problem once when I put on the edge kit on mine but cant rememberwhat I did to fix it
 
Not to disagree with PornstaR but if the welding was any kind of Arc welding (TIG MIG etc.) disconnecting the battery IS a good idea. Welders generate a fairly large EM field that can fry electroinc components, espically if "in circuit".

billygoat
 
It did this crap again yesterday but the opposit more or less. Battery got low due to having all the lights on for awhile while I was messing with things. Put the charger on it for a few hours and fired it up. It would start but not idle, rev fine etc just no idle. Disconnected all three ECM connectors again and it fixed it.
 
billygoat said:
Not to disagree with PornstaR but if the welding was any kind of Arc welding (TIG MIG etc.) disconnecting the battery IS a good idea. Welders generate a fairly large EM field that can fry electroinc components, espically if "in circuit".

billygoat
Click to expand...

I do more than my fair share of welding and quit disconecting batts. long ago due to having to run every rig after welding due to ECU resets. I have never had a single problem.
 
I am gonna go out on a limb and make a guess. The idle control solenoid had gunk built up in it and got sorta stuck in the open position and when you hooked it all back up it would not close down to control the idle speed. I would take it off and clean it.
 
On my jeep it does that every now and then. When it does I'll cut it off open the hood and the sensor facing the front of the vehicle (idle sensor I think) by the throttle position sensor. I disconnect it and reconnect it, works every time. I know I should just bye a new one, but hell it work fine after that for about another month or two. Terry
 
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