89 C4 sputters and rough idle while accelerating
#1
3rd Gear
Thread Starter
89 C4 sputters and rough idle while accelerating
Good evening fellow Corvette enthusiast! I am new to the forum and almost at my wits end! I purchased a 1989 one owner Chevrolet Corvette C-4 with 76,000 miles in December from my boss. He took meticulous care of this vehicle and has sat in a garage at work covered for the past 15 years. In December I installed a brand new top-of-the-line battery with a higher CCA as well as A new alternator dura last gold. It ran fine for a month but then started to stall out as soon as I give it gas it sputters and then cuts off. Today I hired a mechanic and we tested the fuel pump and it was dead so we replaced it. Also replaced the fuel filter. Brand new ignition coil. Brand new air filter. Brand new full set of eight Bosch spark plugs. Brand new mass airflow sensor. Brand new fuel pump relay switch. After doing all of this it still sounds completely the same. If anyone has had this issue before please help before I dump any more money into this beautiful blue car prematurely!! Edit Quote
#2
Team Owner
Good evening fellow Corvette enthusiast! I am new to the forum and almost at my wits end! I purchased a 1989 one owner Chevrolet Corvette C-4 with 76,000 miles in December from my boss. He took meticulous care of this vehicle and has sat in a garage at work covered for the past 15 years. In December I installed a brand new top-of-the-line battery with a higher CCA as well as A new alternator dura last gold. It ran fine for a month but then started to stall out as soon as I give it gas it sputters and then cuts off. Today I hired a mechanic and we tested the fuel pump and it was dead so we replaced it. Also replaced the fuel filter. Brand new ignition coil. Brand new air filter. Brand new full set of eight Bosch spark plugs. Brand new mass airflow sensor. Brand new fuel pump relay switch. After doing all of this it still sounds completely the same. If anyone has had this issue before please help before I dump any more money into this beautiful blue car prematurely!! Edit Quote
#3
I had a sputtering issue I couldn’t figure out in an L98 GTA I had with pretty much new everything EXCEPT IGNITION MODULE and I don’t see that on your list it was an INSTANT cure they’re cheap enough not to worry about the “dumping” money part..
Last edited by Y-bodluvr; 03-11-2019 at 02:22 PM.
#4
Team Owner
#6
Instructor
i had a similar issue, stall/stumble when parking lit speed in my 87 l98, turned out to be the EGR, i unplugged it from the passenger side and the issue went away. something to try