RPM drops, sometimes stalls when coming to a stop.

Awox · #1 01-22-2011, 05:23 PM

Hey guys, couldn't find any threads with quite the issue i'm having, so here goes...

Recently I killed my battery, rear wiper was stuck on some ice overnight and caused a short, drained the battery completely. No juice left at all. I got jumped and the battery recovered, it will start the car just fine now.

However there is a new problem that started just after this. When I come to a stop, the engine RPM dips and rises, near the stalling point, and occasionally does stall before i come to a stop. Funny thing is though, once I have stopped, if it didn't stall, the idle becomes normal again, no dipping, runs smooth. This only happens when I'm stopping, around 1 to 10 mph range. No other times. Could this be related to the battery drawing a lot still on the alternator or could there be a more serious electrical problem?

92 SVX · #2 01-22-2011, 05:40 PM

Quote:

Originally Posted by Awox

Hey guys, couldn't find any threads with quite the issue i'm having, so here goes...

Recently I killed my battery, rear wiper was stuck on some ice overnight and caused a short, drained the battery completely. No juice left at all. I got jumped and the battery recovered, it will start the car just fine now.

However there is a new problem that started just after this. When I come to a stop, the engine RPM dips and rises, near the stalling point, and occasionally does stall before i come to a stop. Funny thing is though, once I have stopped, if it didn't stall, the idle becomes normal again, no dipping, runs smooth. This only happens when I'm stopping, around 1 to 10 mph range. No other times. Could this be related to the battery drawing a lot still on the alternator or could there be a more serious electrical problem?

I am unsure but could the torque converter lockup switch be acting up?

Awox · #3 01-28-2011, 11:51 AM

Naw, pretty much ruled out the tranny because it does it in neutral as well. It's still doing it....battery is still fine, alternator seems to be working to keep it charged. Could it be the voltage limiting junk that charges the battery going out?

icingdeath88 · #4 01-28-2011, 11:53 AM

Try some seafoam in the intake. Look for a recent thread about it, especially the part about the auxiliary air control. Maybe that's sticking closed, so that the engine's not getting any air when you let off the throttle.

Edit: here it is http://www.subaru-svx.net/forum/showthread.php?t=56366

Post #8 is what I'm talking about.