1985 Corvette engine miss
Thread Starter
Racer
Joined: Mar 2017
Posts: 305
Likes: 14
From: Canfield Ohio
1985 Corvette engine miss
I am looking at a 1985 coupe manual shift. Body and interior nice. Owner took it through a car wash left and heard a popping noise. Thought it was from car wash . Parked the car for a couple days started car and popping is still present. I'm thinking plug wire , coil? hoping to hear from collective maybe inexpensive fix but maybe something like broken valve spring?
Owner also states has a lifter ticking.
I'm going to look at the car tomorrow and was hoping to hear what steps or things to check to try and focus and narrow down the problem.
Owner also states has a lifter ticking.
I'm going to look at the car tomorrow and was hoping to hear what steps or things to check to try and focus and narrow down the problem.
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
I am looking at a 1985 coupe manual shift. Body and interior nice. Owner took it through a car wash left and heard a popping noise. Thought it was from car wash . Parked the car for a couple days started car and popping is still present. I'm thinking plug wire , coil? hoping to hear from collective maybe inexpensive fix but maybe something like broken valve spring?
Owner also states has a lifter ticking.
I'm going to look at the car tomorrow and was hoping to hear what steps or things to check to try and focus and narrow down the problem.
Owner also states has a lifter ticking.
I'm going to look at the car tomorrow and was hoping to hear what steps or things to check to try and focus and narrow down the problem.
Thread Starter
Racer
Joined: Mar 2017
Posts: 305
Likes: 14
From: Canfield Ohio
I know I didn't get or give much info but I don't know what could cause the popping unless water got into spark plug leads
Owner said he let car sit for a couple days still does same popping.
He did say he didn't have the problem before going to car wash so something with water happend.
Owner said he let car sit for a couple days still does same popping.
He did say he didn't have the problem before going to car wash so something with water happend.
Last edited by wardie; Jun 14, 2020 at 06:18 PM.
Pro
Joined: Feb 2009
Posts: 655
Likes: 164
From: Vancouver Washington
I would pull the distributor cap and check for moisture, then blow it out with compressed air. Double check all sparkplug wires to ensure they are on all the way.
The car wash could just be a coincidence if the lifter let go at that moment. ???
Good luck.
The car wash could just be a coincidence if the lifter let go at that moment. ???
Good luck.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
Popping
Couple things
1. intake valve hanging open if valves were improperly adjusted.
2. Exhaust smog pump check AIR valve failed , it’s possible he didnt let it sit and cool down enough before Blasting the engine.
3. Or he was changing plugs because one fouls out all the time and got the plug wires in the wrong spot!
4. he hosed the engine when hot and cracked the dist. Cap and its firing 2 cylinders at the same time
1. intake valve hanging open if valves were improperly adjusted.
2. Exhaust smog pump check AIR valve failed , it’s possible he didnt let it sit and cool down enough before Blasting the engine.
3. Or he was changing plugs because one fouls out all the time and got the plug wires in the wrong spot!
4. he hosed the engine when hot and cracked the dist. Cap and its firing 2 cylinders at the same time
Last edited by coupeguy2001; Jun 15, 2020 at 06:42 PM.
Drifting
Joined: Feb 2013
Posts: 1,460
Likes: 48
It's a valve. Run the car and remove and replace plug wires until you find the cylinder that is popping. Pull the valve cover, put a 5/8 wrench on the damper pulley nut and slowly rotate the engine. Chances are one of the valves will not open. That means the cam is wiped or collapsed lifter, broken push rod, broken rocker arm. Good luck.
