C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

car only blinks code 12 but there is something wrong 100%

Thread Tools
 
Search this Thread
 
Old Oct 4, 2013 | 09:05 PM
  #1  
85corvettec4's Avatar
85corvettec4
Thread Starter
Drifting
 
Joined: Aug 2013
Posts: 1,463
Likes: 0
From: Everett Washington
Default car only blinks code 12 but there is something wrong 100%

i just put the tpi back in the car. all new sensors ewverythings bolted up right and it runs and will take wot but theres a vac leak somewhere and it pops out the tail pipe. digi scanner throws codes 51, 25, 32, 33, 34, 35, 36, 41, 43, 46 and when i manually jump the connecter the SES light blinks code 12 nonstop even after minutes. pulled computer and prom everything seemed snug.
Reply
Old Oct 4, 2013 | 09:25 PM
  #2  
xrav22's Avatar
xrav22
Drifting
10 Year Member
 
Joined: Mar 2013
Posts: 1,952
Likes: 239
From: Venice Cali.
Default

I don't know about the scanner but I solved all of my codes using the ECM. When you jump the A and B the security light will blink code 12 3x then show any other codes (bad codes) after all of the bad codes it will blink code 12 to tell you are done. 12 is the beginning and end indicator it is not a code.
Find that leak and mabey adust the timing because vacume problems(forgot to hook up my brake booster) mainly gave me popping in the air cleaner nothing was going on in the tailpipe. My 2 cents
good luck
Reply
Old Oct 4, 2013 | 09:27 PM
  #3  
85corvettec4's Avatar
85corvettec4
Thread Starter
Drifting
 
Joined: Aug 2013
Posts: 1,463
Likes: 0
From: Everett Washington
Default

it only reads code 12 itll flash code 12 for minutes straight. no popping out air cleaner just the tail piper. with the est conencted my car runs at about 10btdc but when i disconnect the est(red/pink) wire it turns off
Reply
Old Oct 4, 2013 | 09:37 PM
  #4  
xrav22's Avatar
xrav22
Drifting
10 Year Member
 
Joined: Mar 2013
Posts: 1,952
Likes: 239
From: Venice Cali.
Default

Yes mine will show 12 untill I pull the paper clip out. But you have gas igniting into the tailpipe that means the exhaust valve is closing late. Otherwise it is pretty much impossible for that to happen. Try(I am not a timing guru) adusting the timing by ear even if you get it right then you may have to redo the minimum idle adjust. At least you won't have backfires which can do things to the converter ect. I like the 85's
Good luck
Reply
Old Oct 4, 2013 | 09:46 PM
  #5  
85corvettec4's Avatar
85corvettec4
Thread Starter
Drifting
 
Joined: Aug 2013
Posts: 1,463
Likes: 0
From: Everett Washington
Default

i cant adjust timing as it wont run with the est disconnected and i set the car at tdc with rotor at #1 thanks man i need alot of it
Reply
Old Oct 5, 2013 | 02:02 AM
  #6  
JrRifleCoach's Avatar
JrRifleCoach
Team Owner
20 Year Member
Veteran: Navy
St. Jude 20 Year Donor
Liked
 
Joined: Sep 2003
Posts: 20,170
Likes: 672
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Default

Don't pull the power wire/s off the coil!
Just adjust the distributor by ear. Using a timing light add 2-3 deg and road test it.

Reply
Old Oct 5, 2013 | 02:25 AM
  #7  
85corvettec4's Avatar
85corvettec4
Thread Starter
Drifting
 
Joined: Aug 2013
Posts: 1,463
Likes: 0
From: Everett Washington
Default

got her done any ideas on the only getting code 12/test code from the manual read. when i reset the ecu then turn the key to ON i still get a check engine light?
Reply
Old Oct 5, 2013 | 02:34 AM
  #8  
xrav22's Avatar
xrav22
Drifting
10 Year Member
 
Joined: Mar 2013
Posts: 1,952
Likes: 239
From: Venice Cali.
Default

'when the key is on the light illuminates that is how you know it is working (not burned out)after starting the engine it should go off.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-1

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-2

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-3

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-4

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
story-5

5 MOST and 5 LEAST Popular Corvette Model Years in History!

 Joe Kucinski
story-6

2027 Corvette Buyer's Guide: Everything You Need to Know!

 Joe Kucinski
story-7

10 Things C8 Corvette Owners Hate (But Won't Tell You)

 Joe Kucinski
story-8

10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

 Brett Foote
story-9

Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

 Joe Kucinski
Old Oct 5, 2013 | 02:35 AM
  #9  
85corvettec4's Avatar
85corvettec4
Thread Starter
Drifting
 
Joined: Aug 2013
Posts: 1,463
Likes: 0
From: Everett Washington
Default

ok thats good to know
Reply

Get notified of new replies

To car only blinks code 12 but there is something wrong 100%





All times are GMT -4. The time now is 10:09 PM.

story-0
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-1
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-2
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-3
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-4
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-5
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-6
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE
story-7
10 Things C8 Corvette Owners Hate (But Won't Tell You)

Slideshow: 10 things C8 Corvette owners hate, but won't tell you.

By Joe Kucinski | 2026-04-01 18:36:07


VIEW MORE
story-8
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

Slideshow: Should you add one of these incredible Corvettes to your garage?

By Brett Foote | 2026-04-01 18:14:05


VIEW MORE
story-9
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

Slideshow: Every Corvette Grand Sport explained

By Joe Kucinski | 2026-03-26 07:13:44


VIEW MORE