86 relays,Part 2
Thread Starter
Instructor
Joined: Mar 2005
Posts: 217
Likes: 0
From: 86 Z51 Coupe Branson,MO
86 relays,Part 2
So I replaced the relays,plugs and wires.I crank it up and it sounds much better,But still won't run on her own.Whats next,Did I miss any vital relays.I replaced 2 MAF,1 Fan 1 near the plenum(Can't find the second?)By the way I also replaced the MAF sensor.For anyone who doesn't know all my underhood relays were melted!What about the IAC,Or any others?Thanks in advace..... 
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
ttt
Maybe Agent86 can send you the schematics-if everything was fried you've got your hands full and really need the Helms manuals if you haven't got them.My guess would be if it starts and runs with a little help from the gas pedal you MIGHThave a problem with the IAC,
you might check the connection to see if it got damaged too. My books are packed so I can't really tell you if there's a relay for it. Just a thought-good luck.
Maybe Agent86 can send you the schematics-if everything was fried you've got your hands full and really need the Helms manuals if you haven't got them.My guess would be if it starts and runs with a little help from the gas pedal you MIGHThave a problem with the IAC,
you might check the connection to see if it got damaged too. My books are packed so I can't really tell you if there's a relay for it. Just a thought-good luck.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by AFogleman
For anyone who doesn't know all my underhood relays were melted!What about the IAC,Or any others?Thanks in advace.....
There is no IAC relay.
RACE ON!!!
Thread Starter
Instructor
Joined: Mar 2005
Posts: 217
Likes: 0
From: 86 Z51 Coupe Branson,MO
I live in Branson,Mo.I can't find a single wire grounded or anything.I have the Chiltons for the vette and it has been quite helpful.Where and what exactly is the IAC and does it do.She still runs a little rich and it hard to keep running.A little gas and it runs.Anything would be great!! 
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
The IAC is the Idle Air Control. The ECM regulates the idle speed by opening the IAC to admit more (or less) air for a faster (or slower) idle. It screws into the side of your TB. It is unlikely that it will make your engine run rich.
If you like that "Chiltons", you are going to love the "Factory Service Manual", with all of it's trouble shooting charts. Pick one up at www.helminc.com
RACE ON!!!
If you like that "Chiltons", you are going to love the "Factory Service Manual", with all of it's trouble shooting charts. Pick one up at www.helminc.com
RACE ON!!!
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
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
With a problem like this you need the Helm manual. It comes with a book dedicated to the electrical system with all the diagrams and schematics you need to track this sort of thing down.
http://www.helminc.com/
1986 Corvette Shop Manual
Price: $88.00 Print to Order
(English, Paper, ST36486)
Go to the site, click Aftermarket Do-It-Yourself, Put ST36486 into the search by Item # and hit go. It should come up.
http://www.helminc.com/
1986 Corvette Shop Manual
Price: $88.00 Print to Order
(English, Paper, ST36486)
Go to the site, click Aftermarket Do-It-Yourself, Put ST36486 into the search by Item # and hit go. It should come up.
Thread Starter
Instructor
Joined: Mar 2005
Posts: 217
Likes: 0
From: 86 Z51 Coupe Branson,MO
I have the entire wiring diagram for the car on CD.I have been through the harness and found nothing.The IAC possibly?I'll put a new one in and let you all know.If anyone has anything they can think of I appreciate it.... 
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
More useful than the wiring diagrams, perhaps, is the diagnostic charts. They're a pretty foolproof way to check all your devices and sensors..
I don't know if Agent86 has those scanned, but I'd give him a holler. They're a part of the larger manual.
I don't know if Agent86 has those scanned, but I'd give him a holler. They're a part of the larger manual.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
If you decide to put in a new IAC, don't forget to clean the passages before putting in the new one.And once you install it you will need to start it up let it run and shut it back down to allow the IAC to set itself.
Team Owner
Joined: Jan 2003
Posts: 20,333
Likes: 262
From: Summerland B.C. Canada
Originally Posted by AFogleman
I live in Branson,Mo.I can't find a single wire grounded or anything.I have the Chiltons for the vette and it has been quite helpful.Where and what exactly is the IAC and does it do.She still runs a little rich and it hard to keep running.A little gas and it runs.Anything would be great!!
http://members.shaw.ca/agent86/IAC%20Diagnosis.pdf
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by AFogleman
The IAC possibly?I'll put a new one in and let you all know.
RACE ON!!!
Team Owner
Joined: Jan 2003
Posts: 20,333
Likes: 262
From: Summerland B.C. Canada
Originally Posted by AFogleman
Is this not a symtop of an IAC.Runs rich and won't stay running.I'm at a loss and I need a code reader.Any suggestions?
Running rich could be alot of things. O2 sensor for starts.
You don't need a code reader to get the codes that the ECM is telling you. Jump terminals 'A' and "B" on the aldl with a paper clip. Turn on the key and the sys light will flash 12 times then flash the code(number of flashes) followed by 12 more flashes.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Originally Posted by AGENT 86
IAC only controls idle speed. End of story
Running rich could be alot of things. O2 sensor for starts.
You don't need a code reader to get the codes that the ECM is telling you. Jump terminals 'A' and "B" on the aldl with a paper clip. Turn on the key and the sys light will flash 12 times then flash the code(number of flashes) followed by 12 more flashes.
Running rich could be alot of things. O2 sensor for starts.
You don't need a code reader to get the codes that the ECM is telling you. Jump terminals 'A' and "B" on the aldl with a paper clip. Turn on the key and the sys light will flash 12 times then flash the code(number of flashes) followed by 12 more flashes.
Thread Starter
Instructor
Joined: Mar 2005
Posts: 217
Likes: 0
From: 86 Z51 Coupe Branson,MO
Could you elaborate more on what you mean.That would be wonderful.How do you know what flashes mean what?I have ordered the helms but I would like it fixed and on the road!!!Know what I mean 
