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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Idle is all over the place!!! Anyone have secret??

  • Thread starter Thread starter reeber
  • Start date Start date Jul 6, 2005
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ProCharger GT

Member
Jun 3, 2004
153
0
16
Cleveland
Aug 2, 2005
#21
  • Aug 2, 2005
  • #21
I have always had probelms with Pro M maf's - get an SCT and be done with it.
 

timeless2

Vi Veri Veni Versum Vicus Vici
Admin Dude
Nov 29, 1999
1,366
202
154
the Shadow Gallery
Aug 2, 2005
#22
  • Aug 2, 2005
  • #22
IAC, mang....
 

reeber

10 Year Member
Mar 10, 2004
574
26
38
Berlin, NJ
Aug 2, 2005
#23
  • Aug 2, 2005
  • #23
forpit2000gt said:
you need the MAF cal. for the injectors. Did the car ever act propely or did something change?
Click to expand...

The car didn't run right after the initial MAF meter was installed with the correct calibrated 38# injectors. I think it was either a poorly calibrated MAF, or a bad sensor. I ordered the 92mm with the correct 60lb. calibration. I'll let you guys know my results... Damn it's expensive!!!!
 

reeber

10 Year Member
Mar 10, 2004
574
26
38
Berlin, NJ
Aug 2, 2005
#24
  • Aug 2, 2005
  • #24
ProCharger GT said:
I have always had probelms with Pro M maf's - get an SCT and be done with it.
Click to expand...

I had problems too, until they sold the company and stuck with just the MAF units. They were getting into more than they can handle, but I believe it's a much better run operation there now.
 

jstreet0204

Active Member
Jun 26, 2003
939
0
36
Winston Salem, NC
Aug 2, 2005
#25
  • Aug 2, 2005
  • #25
reeber said:
The car didn't run right after the initial MAF meter was installed with the correct calibrated 38# injectors. I think it was either a poorly calibrated MAF, or a bad sensor. I ordered the 92mm with the correct 60lb. calibration. I'll let you guys know my results... Damn it's expensive!!!!
Click to expand...

You may be causing more problems here. Calibrated MAF's are kind of a band-aid fix. Meaning the MAF itself should not be adjusted to the injectors. Instead the MAF's transfer curve should be programmed into the EEC and the EEC should handle the injector changes. Now what you have is a MAF calibrated for the wrong size injectors, and a tune that is trying to compensate for the mismatch. If you go with another MAF that is calibrated for the injectors you have now, your tune is going to be way off. I'd recomend going with either a LMAF or an SCT MAF with the correct transfer curve and then setting up the tune the correct way.
 

reeber

10 Year Member
Mar 10, 2004
574
26
38
Berlin, NJ
Aug 2, 2005
#26
  • Aug 2, 2005
  • #26
jstreet0204 said:
You may be causing more problems here. Calibrated MAF's are kind of a band-aid fix. Meaning the MAF itself should not be adjusted to the injectors. Instead the MAF's transfer curve should be programmed into the EEC and the EEC should handle the injector changes. Now what you have is a MAF calibrated for the wrong size injectors, and a tune that is trying to compensate for the mismatch. If you go with another MAF that is calibrated for the injectors you have now, your tune is going to be way off. I'd recomend going with either a LMAF or an SCT MAF with the correct transfer curve and then setting up the tune the correct way.
Click to expand...

I am going to completely retune the car after installing the new MAF. I just think it will be easier to tune when the MAF matches the injectors. Unless, you are suggesting something different?
 

jstreet0204

Active Member
Jun 26, 2003
939
0
36
Winston Salem, NC
Aug 2, 2005
#27
  • Aug 2, 2005
  • #27
reeber said:
I am going to completely retune the car after installing the new MAF. I just think it will be easier to tune when the MAF matches the injectors. Unless, you are suggesting something different?
Click to expand...

Yes I am, you don't want to use a MAF that is matched to injectors if you can avoid it because it throws off your load scaling. Here are some links that explain it.

http://forums.modulardepot.com/showthread.php?s=&threadid=25092&highlight=MAF+replacement
http://www.superstang.com/maf.htm
http://www.mustangworks.com/articles/electronics/InductionBlues.html
 
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