BRINGING BACK 84 cROSSFIRE
Thread Starter
Heel & Toe
Joined: Oct 2013
Posts: 21
Likes: 0
BRINGING BACK 84 cROSSFIRE
I'm trying desperately to bring back to life an 84 Corvette with the Crossfire motor I have done the basics as far as cap rotor plugs wires oil and other similar tasks. I very handy with wrenches but the person I got it from apparently didn't know jack and started plugging and relocating vacuum lines and other parts. Yes a true nightmare for a first time Corvette owner. She runs decent meaning after small changes in sensors the temp in front of the intake was there since 84, replaced it with new one had to use pigtail adapters for the clip. I'm sorry to go on and on but its been fun. My main question is there are a few little plastic vacuum lines coming from a small wiring harness on the passenger side of the engine bay. right next to the blower motor. Where do they go? I think one goes to the heater core valve the other is a mystery. plus there are missing vacuum lines on the top end. Please inform me or send pics without air-cleaner assembly on with description of where the lines go. one more thing I am totally missing the cruise set up cable the whole nine any suggestions.
Team Owner
Joined: May 2005
Posts: 47,038
Likes: 66
From: Albuquerque NM
St. Jude Donor '08 thru '24
I believe in the Beer Fairy
USAF (Retired) 1979-2001
Burning Brakes
Joined: Feb 2013
Posts: 1,173
Likes: 152
From: norway
Burning Brakes
Joined: Feb 2013
Posts: 1,173
Likes: 152
From: norway
Thread Starter
Heel & Toe
Joined: Oct 2013
Posts: 21
Likes: 0
Thank you guys so much for info, it has helped having issues with popping/backfiring only when first start of the day then runs great after she's warm. Fuel pressure is fine and when I replaced plugs no discoloration. 3 out of 4 exhaust pipe outlets blow hot air the 3 pipe outlet passenger side blows out cool air. It idles at 5-6 cold and 7-8 rpm's when warm smells rich in the beginning but dissipates when warm. The front intake temp sensor is brand new. What could be the issue?
Thread Starter
Heel & Toe
Joined: Oct 2013
Posts: 21
Likes: 0
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
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
Thread Starter
Heel & Toe
Joined: Oct 2013
Posts: 21
Likes: 0
I thought the beginning pressure was low. It doesn't bog down when warm at all and I've driven it for a couple of hours straight. No signs of the pump or sending unit giving out, strange. Is that what cause it to burn rich on first start. I thought it was a flooding issue (to much gas to air ratio) in the beginning.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
I don't know. There are several things that can cause it to "smell rich";
*Cat not working yet
*A truly rich mix that is required to make a CFI run smoothly when cold
*A lean mix can cause misfires, resulting in unburnt fuel out the exhaust.
*A.I.R. system not working
Or, it could be overly rich due to a bad Coolant temp sensor, leaking injectors, faulty MAP or vacuum leak etc.
Main point here is, using the "smell-o-meter" to determine your A/F ratio isn't a good or reliable way to do it. I'd start it cold, run it until is starts to run/smell what you consider to be acceptable, then cut it off and pull/read the plugs. That will tell the story about the A/F ratio when it's cold.
*Cat not working yet
*A truly rich mix that is required to make a CFI run smoothly when cold
*A lean mix can cause misfires, resulting in unburnt fuel out the exhaust.
*A.I.R. system not working
Or, it could be overly rich due to a bad Coolant temp sensor, leaking injectors, faulty MAP or vacuum leak etc.
Main point here is, using the "smell-o-meter" to determine your A/F ratio isn't a good or reliable way to do it. I'd start it cold, run it until is starts to run/smell what you consider to be acceptable, then cut it off and pull/read the plugs. That will tell the story about the A/F ratio when it's cold.