Question on Computer code

Reply Subscribe

Thread Tools

Search this Thread

Jul 17, 2006 | 05:24 PM

trgrhappy

Thread Starter

Cross-Country

Joined: Nov 2005

Posts: 95

Likes: 0

From: Portsmouth, OH

Question on Computer code

A friends 94 Mazda B4000 4.0 V-6 has a KOEO stored code of 186, injector pulse width higher than expected (w/baro sensor). I'm not real familiar with injection and was wondering if anyone can tell me what would cause this code, and what to look for to fix it.
It also has a KOER code of 411, unable to maintain low idle during test. I'm thinking this may be tied to the injector pulse.
Any help will be appreciated

Jul 18, 2006 | 02:52 AM

87 XLT

Postmaster

Joined: Oct 2003

Posts: 4,516

Likes: 1

From: SoCal

I show 186 is also "MAF sensor signal voltage is lower than expected."

If I got this code I'd hook up my sensor tester to the MAF & it would tell me in a couple of seconds if the MAF signal was out of whack.

Try cleaning the MAF & see what it does.

Jul 18, 2006 | 05:51 AM

Rockledge

Post Fiend

Joined: Jan 2003

Posts: 9,748

Likes: 16

From: Connecticut

The 186 code means either the MAF and/or MAF circuit is acting up, or you have a problem somewhere with the fuel injection system.

As noted, first try cleaning the MAF sensor:

https://www.ford-trucks.com/forums/s...hreadid=126093

Also, check the fuel system thoroughly, making sure that the fuel pressure is within specs and that the fuel injectors are firing. Check that the fuel pressure regulator isn't leaking (check for fuel in the vacuum line).

Fuel pressure that is not within specs can often be caused by a clogged fuel filter or a bad pump.

Jul 18, 2006 | 12:03 PM

CowboyBilly9Mile

Post Fiend

Joined: Feb 2003

Posts: 6,940

Likes: 2

From: Eastern WA

Also, ignore any KOER and/or CM codes until you have corrected all KOEO codes. After correcting that KOEO code, clear all codes, drive a few miles, then check for any KOER/CM codes.