rough Idle at initial start up
Thread Starter
Supreme Member
iTrader: (3)
Joined: Jan 2006
Posts: 1,489
Likes: 0
From: Flowood,MS
Car: 87 IROC Z
Engine: 5.7 L98 TPI
Transmission: 700r4,2500 stall
Axle/Gears: G80,10 bolt 3.42's
rough Idle at initial start up
Like stated,on the first crank of the day it idles rough and almost dies.I f i give it a little gas for 5 or 10 seconds it straightens out.Its been doing that for about 6 months,but its been no biggie.Car runs with a bit of a studder until it warms up.The strange thing is since it has gotten cold it doesnt do it any longer.Does this sound like a possible IAC issue,maybe TPS?If I cut the car off it will crank right back up with just a bump of the key,sometimes(abot 50 to 75% of the time)after it sits for about an hour it has a hard start issue where I have to hold the key on for a few seconds to get it to start.Sometimes after it sits awhile I have to do that and lightly feather the gas to get it to start easier,a couple of times I noticed a slight puff of white smoke from the pipes.,didnt smell like oil.AGAIN,with the cold weather it seemed to stop.Bad injector maybe?Thanks for any help.BTW no codes,car runs great when it warms up.
Junior Member
Joined: Aug 2007
Posts: 69
Likes: 0
From: Visalia Ca
Car: 86 IROC spts cpe conversion.
Engine: 89 L98 TPI since 2000.
Transmission: NOW A T-5 as of 3/19/08
Axle/Gears: 373s
Re: rough Idle at initial start up
It sounds like it is the IAC sensor. When mine starts up i can hear it (IAC) it's pretty loud. after it warms up I no longer hear it.I have replaced my injectors though. Hope this helps...Greg V
Junior Member
Joined: Aug 2007
Posts: 69
Likes: 0
From: Visalia Ca
Car: 86 IROC spts cpe conversion.
Engine: 89 L98 TPI since 2000.
Transmission: NOW A T-5 as of 3/19/08
Axle/Gears: 373s
Re: rough Idle at initial start up
loud hissing sound. sounds like a vacuum leak.
Thread Starter
Supreme Member
iTrader: (3)
Joined: Jan 2006
Posts: 1,489
Likes: 0
From: Flowood,MS
Car: 87 IROC Z
Engine: 5.7 L98 TPI
Transmission: 700r4,2500 stall
Axle/Gears: G80,10 bolt 3.42's
Re: rough Idle at initial start up
well,I dont have that but I`ll check out the IAC.
Thread
Thread Starter
Forum
Replies
Last Post





