Newbie ? 98 vette with z06 heads z06 intake Comp Cam and corsa titanium exhaust
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Hey guys, i am a complete newbie. Picked up my first corvette. It is a 1998 with z06 heads, intake, and comp cam (not sure the cam model / part #)and a Corsa Titanium exhaust with headers (with no O2 sensors installed)
Question: When the car idles it will briefly idle at 1k rpm but then it will drop down to 500rpm or a little lower (like almost stalling) and spike back up and continue to do this. Previous owner said the spark plugs are 2 stages colder for a nitorus system that was installed. Is this all from the cam or Colder plugs or possibly the 02 sensors not being installed or maybe its something else? Car runs fine its just kind of annoying.
Question: When the car idles it will briefly idle at 1k rpm but then it will drop down to 500rpm or a little lower (like almost stalling) and spike back up and continue to do this. Previous owner said the spark plugs are 2 stages colder for a nitorus system that was installed. Is this all from the cam or Colder plugs or possibly the 02 sensors not being installed or maybe its something else? Car runs fine its just kind of annoying.
#7
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Any recommendations on what plug i should use on this setup ? Should i be using the stock plugs that are recommended for the LS1 or do i need something different because of the head/intake/cam upgrades?
Trending Topics
#8
TECH Resident
iTrader: (3)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
First things first, put new plugs and wires in no matter what. Suggestion, NGK TR-55 and MSD wires. Just so you're 100% sure there's good plugs and wires in it. See if that helps. You can pick up MSD wires (long lasting) and NGK plugs in a combo from numerous places for only around $80.
If you have long tube headers and an off-road X or H pipe (no cats) the front two O2 sensors should be plugged into the headers and the rear O2 sensors won't be used. The rear O2 sensors codes should already be deleted from tuning.
My advice, if it doesn't run right after adding new plugs and wires, maybe look into getting it tuned at a reputable performance shop due to having heads, cam, intake, exhaust mods. You want to be certian it's tuned correctly. Tuning has everything to do with these engines.
If you have long tube headers and an off-road X or H pipe (no cats) the front two O2 sensors should be plugged into the headers and the rear O2 sensors won't be used. The rear O2 sensors codes should already be deleted from tuning.
My advice, if it doesn't run right after adding new plugs and wires, maybe look into getting it tuned at a reputable performance shop due to having heads, cam, intake, exhaust mods. You want to be certian it's tuned correctly. Tuning has everything to do with these engines.
#10
11 Second Club
iTrader: (14)
Join Date: Aug 2010
Location: North Dallas
Posts: 235
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Could be plugs, could be a vacuum leak, could be IAC, could be MAF needs cleaning, could be tune... I'd find a mechanic familiar with LS1's and go from there. Did it not do this before you purchased it?
#11
TECH Addict
iTrader: (6)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I had a vaccum leak that was causing this..At the time, my car was only 'tuned' by my Hypertech programmer BTW. Now witht he full tune, its gone and way better. Will still idle around 1200 rpm when cold and goes down to 1000 after.
TR55 for the win; you dont need colder plug N/A. Do the wires too while at it. I have MSD and they last longer than my GM LS6 wires..
TR55 for the win; you dont need colder plug N/A. Do the wires too while at it. I have MSD and they last longer than my GM LS6 wires..