95 LT1 issues
Thread Starter
1st Gear
Joined: Feb 2021
Posts: 1
Likes: 0
95 LT1 issues
I just got a 95 C4, which has 146k miles, here are the issues that I'm having
-car not shifting at wot (4-speed automatic)
-Tapping noise on the driver side of the engine
-Misfire only when under acceleration
This is my first c4 corvette. Any help would be appreciated, could the opti spark have anything to do with the car misfiring?
Thanks.
-car not shifting at wot (4-speed automatic)
-Tapping noise on the driver side of the engine
-Misfire only when under acceleration
This is my first c4 corvette. Any help would be appreciated, could the opti spark have anything to do with the car misfiring?
Thanks.
Drifting
Joined: Feb 2017
Posts: 1,274
Likes: 399
From: Tacoma WA
2024 C4 of the Year Finalist - Unmodified
Welcome to the wonderful C4 generation of Corvettes. You will find they are wonderful cars!
First search the forum for how to check codes. This can be done with a small jumper wire or even a paper clip. Plenty of threads on that here. “Have you checked for codes?” will often be the first question most people trying to help will ask.
Opti is often the favorite whipping boy for problems with our cars. Not saying it isn’t but it could be a problem with spark plugs, ignition wires, fuel pressure, etc. This is where seeing if any codes are showing up can help diagnose the problem.
The tapping noise could be a lifter issue but could also be something else. More information is needed. Is it always there? Is it louder under certain circumstances?
Does the transmission shift normally all other times other than at wide open throttle? Is it not shifting up at all from any gear or all gears? There are some very savvy transmission experts on this forum but you will need to provide more specific information.
As Whaleman said, separate the issues into specific threads and you may get more responses, but for each of them a lot more information will be needed.
First search the forum for how to check codes. This can be done with a small jumper wire or even a paper clip. Plenty of threads on that here. “Have you checked for codes?” will often be the first question most people trying to help will ask.
Opti is often the favorite whipping boy for problems with our cars. Not saying it isn’t but it could be a problem with spark plugs, ignition wires, fuel pressure, etc. This is where seeing if any codes are showing up can help diagnose the problem.
The tapping noise could be a lifter issue but could also be something else. More information is needed. Is it always there? Is it louder under certain circumstances?
Does the transmission shift normally all other times other than at wide open throttle? Is it not shifting up at all from any gear or all gears? There are some very savvy transmission experts on this forum but you will need to provide more specific information.
As Whaleman said, separate the issues into specific threads and you may get more responses, but for each of them a lot more information will be needed.
Drifting
Joined: Apr 2020
Posts: 1,925
Likes: 610
From: Orange, CA
Hello there! The symptoms you're posting about could be a lot of things. For example, not shifting at WOT could be your transmission on the way out (specifically the clutch packs no longer able to hold torque at WOT), or just old fluid, or maybe even a previous owner who did something stupid with a Hypertech. We're not there looking at it, so we can't tell you exactly what it is.
What Fiberbundle says about codes is something to start with, but it doesn't sound like you have any warning lights on, so it probably won't actually help any. Still, here's the method so you don't have to search around: https://tech.corvettecentral.com/201...trouble-codes/
Since you have a '95, my first suggestion would be to grab a USB-to-ALDL cable and some free software, then start logging some drives. This can show you exactly what the engine is doing, what all the car's sensors are reporting, and even what the transmission is trying to do at any given moment. It's an invaluable diagnostic tool. The cable is here: http://aldlcable.com/products/aldlobd2u.asp
The software is here: http://fbodytech.com/eehack-2/download-eehack/
Best of luck!
What Fiberbundle says about codes is something to start with, but it doesn't sound like you have any warning lights on, so it probably won't actually help any. Still, here's the method so you don't have to search around: https://tech.corvettecentral.com/201...trouble-codes/
Since you have a '95, my first suggestion would be to grab a USB-to-ALDL cable and some free software, then start logging some drives. This can show you exactly what the engine is doing, what all the car's sensors are reporting, and even what the transmission is trying to do at any given moment. It's an invaluable diagnostic tool. The cable is here: http://aldlcable.com/products/aldlobd2u.asp
The software is here: http://fbodytech.com/eehack-2/download-eehack/
Best of luck!
Drifting
Joined: Apr 2020
Posts: 1,925
Likes: 610
From: Orange, CA
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Drifting
Joined: Mar 2007
Posts: 1,295
Likes: 326
From: Central Pennsylvannia
2021 C4 of the Year - Modified Finalist