MrRedline

A couple of days ago i installed a header and catless downpipe. At first the car ran just fine, but after a little test drive the check engine light came on which was no surprise because i did a sensor delete without getting the code removed (the sensor in the downpipe). Along with it though came a bouncing idle.
It revs to about 1200 rpms then falls to 800 rpms and does this continuously. At first the "bouncing idle" happend whenever the car was not in gear. But now when i come to a stop the car idles fine. The problem still occurs when I coast in neutral though. Any advice?
My coolant light also came on even though my coolant is where it is supposed to be in the reservoir. Im not sure if the two problems could be related or not

ramrod1337

iTrader: (1)

I have the same problem everynow and then, but just have cai, just with the idle bouncing that is and idk

insylem

Bouncing Idle: Known commong problem
See
https://www.cobaltss.net/forums/2-0l-lsj-performance-tech-47/idle-problem-cure-finally-116051/

ramrod1337

iTrader: (1)

thanks but still dnt fully understand is it just the filter getting dirty?

MrRedline

My idle is getting better if anything. I know its not getting worse. This problem developed the day after i did the header install so i figured it would have something to do with that

ramrod1337

iTrader: (1)

ya i plan on header back soon so mine wont get better until i clean the filter and run octane booster and injector cleaner my bounce isnt bad and only so often

Caligula

My rpms only move weird when the AC is on.

troyss

It seems to me that the cai on our cars suck ass. My friend's does the same thing. He can be doing 30mph and put it in nuetral to let it coast and it revs up and down like crazy

ramrod1337

iTrader: (1)

ya mines not that bad and ive heard a tune and stage 2 will solve most of that, mine does it randomly will go up to 1200 and down to like 800

freakta

iTrader: (1)

check for a vacuum leak

ramrod1337

iTrader: (1)

Ya Im gna do that!! thanx

Hart

My cai did that so I took it off n just did the airbox mod hasn't did it yet been a month just get the stupid lean code

ramrod1337

iTrader: (1)

you get the same lean code? is that from intake?
Whats the difference like wtw the mod and the intake

Erick161

yup, when the car isnt up to temp it acts like its wants to stall. Never has, just dips down to like 500-600 rpm when i engage the clutch...annoying

ramrod1337

iTrader: (1)

[QUOTE=Erick161;5051194]yup, when the car isnt up to temp it acts like its wants to stall. Never has, just dips down to like 500-600 rpm when i engage the clutch...anno

Yupp

no wat hes sayin is to clean ure throttle body bc alot of times with the cai being routed soo low it picks up water...oil from the filter and oilly air in general, and some sludge can get back up as a cause form this so hes sayin to clean outt the tb and I would recommend a catch can to prevent somin lke this from happenin again...i bought my greddy from ebay it hooked right up and been wrking wonders

HickOverLOrd

Does it only do it when your A/C is on? Mine did then I took advice from the thread posted above and cleaned my throttle body. Idles completely fine now.

ramrod1337

iTrader: (1)

Do you have an aftermarket intake? if so...
no wat hes sayin is to clean ure throttle body bc alot of times with the cai being routed soo low it picks up water...oil from the filter and oilly air in general, and some sludge can get back up as a cause form this so hes sayin to clean outt the tb and I would recommend a catch can to prevent somin lke this from happenin again...i bought my greddy from ebay it hooked right up and been wrking wonders

Good to hear i need to do mine

MrRedline

ok guys i figured it out. When i did the o2 sensor delete i forgot to tape up the wire. So it just dangled there until it shorted out on something. When it shorted it blew my emissions fuse. taped the wire and replaced the fuse. good as new