Having difficulty running KOER self-test - MustangForums.com

Go Back  MustangForums.com > Ford Mustang Tech > 5.0L (1979-1995) Mustang
Reload this Page >

Having difficulty running KOER self-test

5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Having difficulty running KOER self-test

Old 02-09-2011, 06:23 PM
1st Gear Member
Thread Starter
Join Date: Jan 2011
Location: Orlando
Posts: 109
Default Having difficulty running KOER self-test

I've jumped the connectors accordingly and have successfully ran a KOEO test. But I've ran my car for 10 minutes and nothing has happened. Tried this twice so far. Gas pedal was not touched on both attempts. What's going on here?
Quickbird144 is offline  
Old 02-09-2011, 08:55 PM
Bubba 95SN
4th Gear Member
Join Date: Apr 2009
Location: N.C.
Posts: 1,893

Warm up engine, keep clutch depressed throughout test or you will get a 67. Start engine enter test. Should flash 4 times(8cylinder ID)Eventually will get 1 flash brief wot(mash gas briefly wide open throttle) codes will repeat themselves twice. At end of that goose (1/3 throttle.) Computer will start cutting off injectors one at a time, flash 1-8 means that cylinder is not contributing, Flashes 9 pass, goose throttle again wait for results goose a third time wait for results(this was the cylinder balance test) After doing koeo test you can't just start engine and enter koer test. Turn ignition off wait for a minute then enter koer test

Last edited by Bubba 95SN; 02-09-2011 at 09:03 PM. Reason: last 2 sentences
Bubba 95SN is offline  
Old 02-09-2011, 09:03 PM
Bubba 95SN
4th Gear Member
Join Date: Apr 2009
Location: N.C.
Posts: 1,893

81-85 koeo deal with thermactor system is it still there and hooked up? 34 koem is evp (sensor on top of egr) is it there? koem 91 lean O2 reading in memory.Fix koeo first, then koer next,(cylinder balance can help pinpoint a missing cylinder) lastly fix the koem codes.
Bubba 95SN is offline  
Related Topics
Thread Starter
Last Post
10-07-2015 08:02 PM
09-23-2015 05:02 PM
SVT Forums
09-18-2015 11:34 AM
V6 (1994-2004) Mustangs
09-16-2015 08:11 AM
Parts For Sale
09-10-2015 04:30 PM

Thread Tools
Search this Thread
Quick Reply: Having difficulty running KOER self-test

Featured Sponsors
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.