MAF Adjustments?

cschulzy · 08-31-2001, 01:24 AM

I have an 89 GT 5 speed and want to know if and how you can adjust your MAF sensor voltage. The car has failed an emissions test in Saudi Arabia and the common trick that the other guys do here with various other cars is to adjust the MAF. They just lean it out before they take their cars in. The MAF's on their cars have an adjustment screw, but the Mustang MAF dosn't appear to have one.

Mach 1 · 08-31-2001, 04:44 AM

buy "the optimizer" from Pro-m, or a "adjuster" from IST.

try www.pro-flow.com or www.mass-air.com

------------------
1993 GT/AOD
'93 Mustang GT

LoneRanger · 08-31-2001, 10:02 AM

Hey CSchulzy: I don't know if this will help but have you already tried giving your 'stang a fresh tuneup (plugs, cap/rotor, wires, PCV valve, etc)??? I don't know how stringent the emissions tests are in Saudi but if the car still has the cats in place (even if you don't) and is running properly it should pass emissions here in the states. I had a '91 LX with no catalytic convertors with Cobra Intake, 73 mm MAS, 65 mm Throttle body and GT40 heads and it passed with flying colors. Hope this helps. You might want to check a search engine on the Web to give you the specs on the right voltage to use for the MAS I remember seeing it somewhere but can't remember where. Jeff

jimberg · 08-31-2001, 11:37 AM

When's the last time that you replaced the oxygen sensors? Do you have catalytic converters? EGR valve? What about a tune up? What type of gasoline are you using? What part of the test did you actually fail and by how much? What do they test for in Saudi Arabia?

Running leaner would help with HC but hurt NOx emissions. Advancing timing helps with NOx, but would hurt HC emissions.

What you do to fix your problem all depends on what failed.

------------------
351W 89 Mustang GT Convertible

cschulzy · 09-05-2001, 12:59 PM

Thanks for the help guys. I have done the plugs, wires, cap, rotor. The car does not have cats or O2 sensors. They are mixing unleaded and leaded fuel here at the moment until the stocks of leaded run out so the fuel here is not to good a quality. As they don't speak any english or in my case Australian, the guy said to me "To high, To high, and the readout I was able to see was 5.6%. The limit is 4.5%. Sorry I'll try to find out what this is.
Thanks again
Schulzy

08-31-2001, 01:24 AM	#1
cschulzy Registered Member Join Date: Jun 2001 Location: Saudi Arabia Posts: 27	MAF Adjustments? I have an 89 GT 5 speed and want to know if and how you can adjust your MAF sensor voltage. The car has failed an emissions test in Saudi Arabia and the common trick that the other guys do here with various other cars is to adjust the MAF. They just lean it out before they take their cars in. The MAF's on their cars have an adjustment screw, but the Mustang MAF dosn't appear to have one.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Hydraulic valve adjustments	82 GT	Windsor Power	10	08-20-2003 05:20 PM
valve adjustments	gtstang83	Windsor Power	0	01-18-2002 04:51 PM
timing adjustments on a '95 5.0	cschauerj50	Windsor Power	1	05-08-2001 09:08 PM
Belt tensioner adjustments	Shotgun28	Windsor Power	2	03-24-2001 06:25 PM
AOD adjustments?	93GTDIN	Windsor Power	3	02-10-2001 10:32 PM

08-31-2001, 04:44 AM	#2
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	buy "the optimizer" from Pro-m, or a "adjuster" from IST. try www.pro-flow.com or www.mass-air.com ------------------ 1993 GT/AOD '93 Mustang GT

08-31-2001, 10:02 AM	#3
LoneRanger Registered Member Join Date: Aug 2001 Location: Sterling Heights, MI, USA Posts: 13	Hey CSchulzy: I don't know if this will help but have you already tried giving your 'stang a fresh tuneup (plugs, cap/rotor, wires, PCV valve, etc)??? I don't know how stringent the emissions tests are in Saudi but if the car still has the cats in place (even if you don't) and is running properly it should pass emissions here in the states. I had a '91 LX with no catalytic convertors with Cobra Intake, 73 mm MAS, 65 mm Throttle body and GT40 heads and it passed with flying colors. Hope this helps. You might want to check a search engine on the Web to give you the specs on the right voltage to use for the MAS I remember seeing it somewhere but can't remember where. Jeff

08-31-2001, 11:37 AM	#4
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	When's the last time that you replaced the oxygen sensors? Do you have catalytic converters? EGR valve? What about a tune up? What type of gasoline are you using? What part of the test did you actually fail and by how much? What do they test for in Saudi Arabia? Running leaner would help with HC but hurt NOx emissions. Advancing timing helps with NOx, but would hurt HC emissions. What you do to fix your problem all depends on what failed. ------------------ 351W 89 Mustang GT Convertible

09-05-2001, 12:59 PM	#5
cschulzy Registered Member Join Date: Jun 2001 Location: Saudi Arabia Posts: 27	Thanks for the help guys. I have done the plugs, wires, cap, rotor. The car does not have cats or O2 sensors. They are mixing unleaded and leaded fuel here at the moment until the stocks of leaded run out so the fuel here is not to good a quality. As they don't speak any english or in my case Australian, the guy said to me "To high, To high, and the readout I was able to see was 5.6%. The limit is 4.5%. Sorry I'll try to find out what this is. Thanks again Schulzy