Need help 96 Corvette idles ruff
Thread Starter
5th Gear
Joined: Sep 2023
Posts: 5
Likes: 0
Need help 96 Corvette idles ruff
Good day to my Corvette family. I have just bought my first Corvette in September of 23 and from the beginning it has had a rough idol. Not to the point where it shuts off definitely notice a mess after it has been driven for a bit and is up to temp.. . I have read on some other LT1 posts and I have already replaced..
1. EGR valve
2. Spark plugs
3.02 sensors bank 1 both sides
4. IAC
5 Mass airflow
6 fuel injectors
7. Spark plug wires
8.ICM cleaned and put new grease as it was dry as a bone.. now it is still doing it .. I love this car and has only 60,000 miles so I want to keep it for as long as I can.. any other idea that would cause this.. it will run like a cat on fire when you put the foot to the floor just idles bad .
1. EGR valve
2. Spark plugs
3.02 sensors bank 1 both sides
4. IAC
5 Mass airflow
6 fuel injectors
7. Spark plug wires
8.ICM cleaned and put new grease as it was dry as a bone.. now it is still doing it .. I love this car and has only 60,000 miles so I want to keep it for as long as I can.. any other idea that would cause this.. it will run like a cat on fire when you put the foot to the floor just idles bad .
Pro
Joined: Oct 2012
Posts: 580
Likes: 121
From: Grapevine TX
I'm wondering if a previous owner may have replaced the camshaft with something a bit hotter than stock. What you're describing sounds exactly like what my 96 with a GM Hot Cam does. In my case it's not actually a miss but rather a mild cam lope. On a cold start it's fairly smooth but once warmed up you can definitely feel that cam lope at idle. Your description of it running like a cat on fire also sounds about right for a cammed car. Unfortunately I don't know of an easy way to tell for sure if a car is cammed, maybe someone more knowledgeable on that aspect could chime in. The only way I can think of would be to pop a valve cover and use a dial indicator to measure the lift on the rocker arms as you manually rotate the engine. What I'm not sure of on this is if the lifters may compress a bit and give false measurements.
Thread Starter
5th Gear
Joined: Sep 2023
Posts: 5
Likes: 0
I'm wondering if a previous owner may have replaced the camshaft with something a bit hotter than stock. What you're describing sounds exactly like what my 96 with a GM Hot Cam does. In my case it's not actually a miss but rather a mild cam lope. On a cold start it's fairly smooth but once warmed up you can definitely feel that cam lope at idle. Your description of it running like a cat on fire also sounds about right for a cammed car. Unfortunately I don't know of an easy way to tell for sure if a car is cammed, maybe someone more knowledgeable on that aspect could chime in. The only way I can think of would be to pop a valve cover and use a dial indicator to measure the lift on the rocker arms as you manually rotate the engine. What I'm not sure of on this is if the lifters may compress a bit and give false measurements.
Thread Starter
5th Gear
Joined: Sep 2023
Posts: 5
Likes: 0
I have a cheap one from AutoZone that all it will say is O2 bank 1-2 lean I have already replaced the 02 sensors twice. What is a good cheap OBD2 scanner that can actually read a specific miss fire on a cylinder. That's is under $100
Racer
Joined: Jun 2019
Posts: 276
Likes: 69
From: Florida
If you can’t hook up a vacuum gauge to check your idle vacuum in inches of mercury, with the car at idle get a propane torch and turn it on, don’t light it and pass it around all of your vacuum lines/manifold gaskets etc. If the idle RPMs increase you found the area of your vacuum leak.
