Idle Problems
Idle Problems I recently replaced the alternator on my Z. When I pull up to a stop sign and put it in neutral it barely idles @500rpms and sometimes dies. The idle is set @ 850. When I first start it there are no idle issues of any sort. Only when I'm stopping, I can also see my voltage gauge drop drastically when this happens. Could this be a symptom of a bad battery? If so why would it still be able to start? Does my PCM need to be reflashed? I'm pretty confused at this point and any help would be appreciated.
Teching In
Joined: Oct 2008
Posts: 42
Likes: 0
All alternators are not the same.They can look the same on the outside but be different inside.Case in point,roadmaster,impala and caprice GM 140 amp alternators look and fit all three cars but some have different voltage regulators and will cause problems if installed on the wrong car.Where did you get yours?
Could need to reset the IAC since the car was off for a while for the alternator change?
Might wanna reset it like this. http://shbox.com/1/4th_gen_tech2.html#iac_reset
Check the TPS? Maybe its dirty as fck like mine was and is having trouble finding idle, my last idle problem was fixed by cleaning that.
Also like ohio says, could be the alternator. There's a few things it could be, first thought is the alternator though. Just throwin ideas out there, good luck.
Might wanna reset it like this. http://shbox.com/1/4th_gen_tech2.html#iac_reset
Check the TPS? Maybe its dirty as fck like mine was and is having trouble finding idle, my last idle problem was fixed by cleaning that.
Also like ohio says, could be the alternator. There's a few things it could be, first thought is the alternator though. Just throwin ideas out there, good luck.
Could need to reset the IAC since the car was off for a while for the alternator change?
Might wanna reset it like this. http://shbox.com/1/4th_gen_tech2.html#iac_reset
Check the TPS? Maybe its dirty as fck like mine was and is having trouble finding idle, my last idle problem was fixed by cleaning that.
Also like ohio says, could be the alternator. There's a few things it could be, first thought is the alternator though. Just throwin ideas out there, good luck.
Might wanna reset it like this. http://shbox.com/1/4th_gen_tech2.html#iac_reset
Check the TPS? Maybe its dirty as fck like mine was and is having trouble finding idle, my last idle problem was fixed by cleaning that.
Also like ohio says, could be the alternator. There's a few things it could be, first thought is the alternator though. Just throwin ideas out there, good luck.
I havent attempted to reset IAC yet, but I'll be sure to try it soon. Thanks for the tip. I had the battery disconnected all day.
TECH Resident
Joined: Jul 2009
Posts: 772
Likes: 0
From: Bahrain
Could need to reset the IAC since the car was off for a while for the alternator change?
Might wanna reset it like this. http://shbox.com/1/4th_gen_tech2.html#iac_reset
Check the TPS? Maybe its dirty as fck like mine was and is having trouble finding idle, my last idle problem was fixed by cleaning that.
Also like ohio says, could be the alternator. There's a few things it could be, first thought is the alternator though. Just throwin ideas out there, good luck.
Might wanna reset it like this. http://shbox.com/1/4th_gen_tech2.html#iac_reset
Check the TPS? Maybe its dirty as fck like mine was and is having trouble finding idle, my last idle problem was fixed by cleaning that.
Also like ohio says, could be the alternator. There's a few things it could be, first thought is the alternator though. Just throwin ideas out there, good luck.
Trending Topics
I used a toothbrush and the seafoam deep creep throttle body cleaner. You can get deep creep at advance or autozone I believe.
http://www.amazon.com/DEEP-CREEP-LUB.../dp/B0002KL6TM
Try cleaning the TPS?
http://www.amazon.com/DEEP-CREEP-LUB.../dp/B0002KL6TM
Try cleaning the TPS?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo I reset the IAC again, but this time I let it run for about 10 minutes. That seemed to cure the problem. Thanks for the info... now I just need to find a good deal on Bilstein shocks. I have a feeling mine are original, my Z rides like a lumberwagon
