Boosted Foxbody...running Rich...unhooked Maf...no Change In Engine Fuction?

killer5.0

5 Year Member

Oct 8, 2009

725

83

59

Jul 3, 2017

#1

• Jul 3, 2017

• #1

okay so i had the car up to operating temp today so i could run KOER test....idles clean, but the car runs pig rich and bogs down dips into mid 9s on my wideband WOT and excessive popping on decel etc....decided to unhook the MAF (BA2400) to see if that might be the culprit. no change whatsoever to idle/engine smoothness etc with it unplugged....i didnt drive it like that just idle... how to i determine if its the harness or the sensor? could it just be dirty?

thanks

 

killer5.0

5 Year Member

Oct 8, 2009

725

83

59

Jul 3, 2017

#2

• Jul 3, 2017

• #2

Key on 12v across red/blk wires...(a/b)

Engine running voltage across wires c/d
1.0 volts at idle
1.3-5 volts 2000-2500rpm
1.5-1.7 volts 3000rpm

Had my wife running the rpms while i checked voltage so had a little fluctuation in rpm values lol

 

RaggedGT

Been here over a DECADE and still no CT

Mod Dude

Jul 20, 2014

4,739

3,188

203

Taylorsville ky

Jul 4, 2017

#3

• Jul 4, 2017

• #3

What are you using for engine management?
I have limited experience with the issues you are having,but I can point you in the direction of a guy that maybe able to help- https://www.stangnet.com/mustang-forums/threads/steves-megasquirt-tunerstudio-help-thread.888730/

 

vristang

15 Year Member

Mar 31, 2005

4,933

101

124

Seattle

Jul 5, 2017

#4

• Jul 5, 2017

• #4

What KOEO/KOER codes came up?
Disconnecting the MAF is not a reliable way to diagnose anything...

Your voltage readings look to be in the ball park though...
http://broncozone.com/uploads/monthly_08_2012/post-3816-0-72843700-1346072584.gif

 

killer5.0

5 Year Member

Oct 8, 2009

725

83

59

Jul 5, 2017

#5

• Jul 5, 2017

• #5

SCT 4 bank chip...

Originally i had codes

Koeo 15,67,85
Cm 11
Koer 21
Cyl balance 9

Removed chip...and depressed clutch (which i didnt the first time)

Koeo 31, 81, 82, 85, 84
Cm 11
Koer 21
Cyl bal 9

Brought car to operating temp...chip installed...clutch depressed

Koeo 15,85
Cm 11
Koer 11
Cyl bal 9

So i believe chip is causing 15...i have no purge canister which i believe causes 85...all the codes with chip removed are smog related (egr etc) that my chip turns off...

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,260

17,945

224

Massachusetts

Jul 6, 2017

#6

• Jul 6, 2017

• #6

Code 15 is due to chip.

With MAF unplugged, do you get a code?

 

killer5.0

5 Year Member

Oct 8, 2009

725

83

59

Jul 14, 2017

#7

• Jul 14, 2017

• #7

hmm i didnt try that...ill try that and report back