hesitation on 84? need thoughts
Thread Starter
Instructor
Joined: Apr 2004
Posts: 222
Likes: 0
From: Pearl Harbor Hi
hesitation on 84? need thoughts
Okay, so there I was in my 84 doin 35mph when i felt like doin 80mph. Anyways... she starts hesitating. My first thought....fuel pump. Second thought...spark. Third thought....vacuum. The idle fluctuates more than normal, and the engine really looses RPM when the tranny changes gears (auto). It takes a bit longer to start the engine as well. It's gotta turn over about 3 or 4 seconds longer.
Well, the fuel pump is way old...i know this. I haven't replaced it since I bought it (3 years ago) and no clue when and if it has been replaced.
Spark plugs...while not new....and not embarrassingly old.... shouldn't make the engine sound like I'm pushing and releasing the gas pedal.
Vacuum lines.....well I can only say that I didn't see anything out of place or any splits in the lines.
Any thoughts would definitely be appreciated. I bought a fuel pump from AutoZone. Still wrapped up.
Well, the fuel pump is way old...i know this. I haven't replaced it since I bought it (3 years ago) and no clue when and if it has been replaced.
Spark plugs...while not new....and not embarrassingly old.... shouldn't make the engine sound like I'm pushing and releasing the gas pedal.
Vacuum lines.....well I can only say that I didn't see anything out of place or any splits in the lines.
Any thoughts would definitely be appreciated. I bought a fuel pump from AutoZone. Still wrapped up.
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
CFI is absolutely right... do not just throw parts at it. If it were me I would start with the simple things.
Check spartk plug wires and connections. Remove distributor cap and look at the rotor. How do the connections look? pitted? Mine wants spark plugs every year. If I don't change them I get some hestitations in it. Fuel psi? Maybe it just wants a good tune up.
Check spartk plug wires and connections. Remove distributor cap and look at the rotor. How do the connections look? pitted? Mine wants spark plugs every year. If I don't change them I get some hestitations in it. Fuel psi? Maybe it just wants a good tune up.
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Most people hook up the gauge between the tb's. I also want to suggest maybe a fuel filter if you haven't changed that in a while as well. It doesn't sound like anything major just take your time and start with the basics.
Good luck.
Good luck.
Thread Starter
Instructor
Joined: Apr 2004
Posts: 222
Likes: 0
From: Pearl Harbor Hi
So get this....pulled the plugs....and OH man. If you guys could see them, you'd ban me from the forum forever!!! Yeah, pretty cruddy. Terminals on the cap aren't too pretty either. Kinda oxidized.
I made it through 3 plugs after work before I couldn't see anymore. Gonna finish tomorrow. Figure this is enough to cause the issue?
I'll keep ya posted.
I made it through 3 plugs after work before I couldn't see anymore. Gonna finish tomorrow. Figure this is enough to cause the issue?
I'll keep ya posted.
Instructor
Joined: Sep 2006
Posts: 161
Likes: 0
From: Yorkville IL
The plugs have a lot to do with your hard starting and rough idle, not sure about the rest.
What's your coolant temp when she acts up?
Probably means nothing, but my car was behaving exactly like that, if the coolant temp was over 230, which it was a lot because the rad was plugged solid.
I know, probably don't mean a thing... still, where's your temp at?
What's your coolant temp when she acts up?
Probably means nothing, but my car was behaving exactly like that, if the coolant temp was over 230, which it was a lot because the rad was plugged solid.
I know, probably don't mean a thing... still, where's your temp at?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
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
