hmmm.... something in my 4runner has been making a sound like that ever since I got it about 3 years ago. After driving, it does it steadily about once every 2 seconds. A day later if it's been sitting, less frequently. On the rare occasion that it has sat for 3-4 days, it will make the sound bout once every minute. Definitely on the driver's side, but haven't been able to locate it better than that. I have always wondered if it is some kind of vacuum thing, or if it is coming from the battery. Sure doesn't seem like it's from the battery. I've had the same cheapo Walmart battery in there since I purchased it in 2007. I've asked mechanics about it, but it doesn't seem to be any kind of commonly known problem.
1996 4runner Limited, retrofitted E-locker, manual hubs, front King Coilover 2" lift, rear Landcruiser 3" lift, drop panhard bracket, 2000 4runner center console/e-brake conversion, K&N air intake, throttle body spacer, OBX headers.
Stay classy Colorado!
Last edited by 4runner luv; 09-23-2010 at 08:04 PM.