hanging idle after disconnecting battery

bobc83

Member

Jul 31, 2007

130

0

16

Normal,IL

Apr 28, 2009

#1

• Apr 28, 2009

• #1

so last night I was doing a bunch of wiring for gauges and wideband and yada yada....

I disconnected that positive cable for a couple hours while I did my work and now when driving around town the idle just hangs and it's stupid. It never did this before I disconnected the battery. And it doesn't sound like something that would affect the idle to me.

I checked every last vacuum hose and connection from the air filter to the lower intake. I even reloaded the tune from my SCT and still nothing.

starting to get mad at this car!

 

Flghtmstr1

Member

Mar 31, 2005

572

4

19

Springfield, PA

Apr 28, 2009

#2

• Apr 28, 2009

• #2

Just give the PCM a bit to re-learn the engine's idle characteristics.

 

bobc83

Member

Jul 31, 2007

130

0

16

Normal,IL

Apr 28, 2009

#3

• Apr 28, 2009

• #3

How long is sufficient for it to adjust before I raise concern about something being wrong? I've driven it for 10+ miles now with no difference.

 

S

spederman

Member

Apr 13, 2005

732

0

16

Apr 28, 2009

#4

• Apr 28, 2009

• #4

it usually takes my car longer than 10 miles to re learn the idle. It seems like it takes a few days for my car. And then it also has to re learn the idle seperate for when i turn the A/C on. I wouldnt worry about it. Give it a few days.

 

bobc83

Member

Jul 31, 2007

130

0

16

Normal,IL

Apr 28, 2009

#5

• Apr 28, 2009

• #5

ok ty guys, I will update on friday or so. I'm sure I can't be the only one that worries about stupid stuff lol

 

joshjwc9

Active Member

Jun 12, 2006

1,095

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39

Palm Harbor, FL

Apr 28, 2009

#6

• Apr 28, 2009

• #6

I'm right there with you man, from having battery problems, (sweeping gauges), intake manifold worries, and any squeak, thunk or smell, if it can't be explained I ask around.

Give it a tank of gas or 100 miles of normal driving, but I see your Vortech might make that get out of hand.

 

tannerc91gt

This last 25% is foreign territory at this point

Founding Member

Nov 29, 1999

4,392

2,967

234

Indiana

Apr 28, 2009

#7

• Apr 28, 2009

• #7

Or you can do like the manual says.which I doubt most people have read. When you've reconnected the battery just start the car and let it sit for a few minutes. The idle will surge but eventually the ECU will find its idle. A lot faster than waiting a few days or a whole tank of gas

 

bobc83

Member

Jul 31, 2007

130

0

16

Normal,IL

Apr 28, 2009

#8

• Apr 28, 2009

• #8

Of course it finds idle in a min or two, that was easy...but the idle hangs btwn 1k and 1.5 when driving and taking out of gear

 

Novanutcase

New Member

Oct 21, 2007

37

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0

Apr 28, 2009

#9

• Apr 28, 2009

• #9

bobc83 said:

Of course it finds idle in a min or two, that was easy...but the idle hangs btwn 1k and 1.5 when driving and taking out of gear

Click to expand...

I have the same exact problem.

If I start the car in the morning it idles at around 1000rpm for warm up and then drops to around 700 rpm. Once I drive it a couple miles it hangs at around 1100 rpm. If I shut the car off and restart it idles at 700 rpm again until I drive it a couple miles then it starts hanging at 1100 rpm.

I thought it might be the IAC but the weird thing is that it idles fine if I turn the car off then restart it. I'm gonna take off the IAC and give it a good cleaning and see if that does the trick but I would think that if it was the IAC it would do it all the time. Same for a vacuum leak. If it's leaking it should do it all the time.

Also, it doesn't matter if the engine is just warmed up or has been running for an hour or so.

Any suggestions?

John

 

G

GDTrumbo

Member

Jan 22, 2009

199

0

17

Nashville, TN

Apr 30, 2009

#10

• Apr 30, 2009

• #10

Disconnect the battery again. Clean the TB with a cleaner safe for Teflon lined TB's. Clean the MAF & air temp sensors with CRC's MAF cleaner product and try it again.

GT