strange....idle now 1200 after replacing battery...

**FMS01** · 23-02-2006, 01:38 AM

Strange...

I went away for a week, came back to find the battery flat as a pancake, still able to jump start but wouldn't recharge. Check the receipt, only 11 months old WOOHOO!, back to the auto elec and get a replacement under warranty (Brisbane auto elecs, great guys!).

Ever since fitting the new battery the car idles at 1200RPM instead of the normal 800ish, even when warmed up.

Car is a AE92 with 20V ST. No PS or AC so it's niether of those gone wrong.

Any ideas?

Cheers,
Julian.

**oldcorollas** · 23-02-2006, 01:45 AM

bumped off a vacuum tube?
auto elec changed it to get mroe work?

ed · 23-02-2006, 02:03 AM

maybe your old battery was fucked and required alt to load up and charge it all the time, the alt dragging your idle speed down to 800... now the battery is all good, the alt/req has backed off the charge/alt load and freed up the engine a bit, raising the idle rpm??

cheers
ed

**DigitalPho3nix** · 23-02-2006, 02:13 AM

I haven't replaced my battery or anything, but my corolla (4age) used to idle 900-1000ish. Then I did some naughty driving (read: redlining) and found that my engine idled 1300 ish afterwards. Being a little suspicious, I found that a vacuum hose had popped off. It was the one that connected the throttle to the side of the airbox from memory...

Anyways, slipped it back on and the idle dropped straight back down.

Perhaps it is your problem too?

**FMS01** · 23-02-2006, 08:02 AM

thanks guys, i'll have a look at the vacuum lines this morning and see what i can see.

**Draven** · 23-02-2006, 08:08 AM

for me the culprit was a cracked vacuum hose. of course the crack was on the bottom side of the hose and nearly invisible, so it took me weeks to find it

**camrygt?** · 23-02-2006, 09:29 AM

after reconnecting the battery to my 205 3sgte ecu it will idle at about 1200 for sometimes up to 3 days before it sorts itself out and drops back to about 700. Sometimes it also sorts itself out in the first trip..got a mind of its own

**-GT-** · 23-02-2006, 12:47 PM

My s/t 20v has idled at 1200-1300 ever since i put it in. Have searched and searched through vac lines and found nothing. Let us know if it turns out to be something else, but i'd say vac line sounds like it. If only i could find mine...

**o_man_ra23** · 23-02-2006, 01:42 PM

could be the computer needing to reset itself. Run the car at idle, then turn it off, and turn the key to the IG position, and leave it there for half an hour... i think that works on some foul cans etc... could be similar.

Cheers, Owen

**oldcorollas** · 23-02-2006, 02:34 PM

Originally Posted by -GT-

My s/t 20v has idled at 1200-1300 ever since i put it in. Have searched and searched through vac lines and found nothing. Let us know if it turns out to be something else, but i'd say vac line sounds like it. If only i could find mine...

GT, perhaps yours is an intake leak then?

**Aust162** · 23-02-2006, 02:44 PM

ECU has been reset. simple. the idle will be higher for a while. it will drop back down again. it happens when i disconnect my afm plug on my 3s. same thing really

**JustCallMeOrlando** · 23-02-2006, 02:51 PM

My idle isn't affected by me resetting the ECU at all. Last night at the drags my AFM plug came off, yet as soon as I put it back on, back to its rock-solid 700rpm idle.

I'm with the rest of the guys that it's probably something vacuum related thats been touched.

**FMS01** · 23-02-2006, 11:08 PM

I've had a poke around under the bonnet with the engine running, couldn't see any vac lines off nor did runnning my fingers over all the hoses have any affect on the idle. I'll have another look tomorrow morning when i get to work though.

PS. I am the only one that has poked around under the bonnet, apart from when they (auto elecs) tested the old battery and my alternator. When i went back to get the new battery later that afternoon they were flat out so I fitted the battery myself.