Excessive rich condition

bgdowski

Member
Jan 11, 2007
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6
Daytona Beach, FL
88 motor with a stock fuel system except for a 255 pump, converted it from SD to MAF yesterday. A9L computer, #36 ford racing injectors, and C&L calibrated MAF. I purchased the MAF with the housing used off of the forums. The car started up nicely, but smelled extremely rich, when i rev it, it dumps a little black smoke out of the pipes. I swapped to a gt-40 upper/lower at the same time, but i really dont think its a vac leak. I am pulling a solid 20'' of vac at idle. I figured the computer needed to do some learning so i took it out for a drive to try and clean it up (about 45 miles with mixed driving conditions and styles) Would a bad maf cause it to dump fuel and occasionally stall even after all the driving? Sometimes while driving it when i bring the rpm up to let up the clutch, and the motor gets some load, the rpms drop and it bogs hard.


I could definitely use some advice, Its a daily!
 
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jrichker

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Ditch the 36 lb injectors, they are way too big for a stock engine. Use 19 lb injectors and a 94-95 Mustang GT MAF - $40-$100. It is 70 MM instead of the stock 55 MM on regular stangs built prior to 94. It uses a slip on duct on the side that goes to the throttle body and a 4 bolt flange on the other. You need a flange adapter to fit the stock slip on air ducting that goes to the air box. Wiring plugs right in with no changes. *1 *2

*1.) Metal flange adapter Kurtz Kustomz Motorsports, Inc. KKM Buy the TR70 for $44.95. Or spend some time on eBay looking for one that may fit.
Try AutoZone and ask for 81413 - Spectre / 3 in. Aluminum Intake Mass Air Flow Sensor Adapter at $12.00. You may have to order it online.

*2.) MAF & sensor interchange
The 94-95 Mustang 5.0 MAF & sensor is also found on:
1994-95 Mustang 3.8L F2VF-12B579-A2A,
1992-94 Crown Victoria 4.6L F2VF-12B579-A2A,
1994-95 Mustang, Mustang Cobra 5.0L F2VF-12B579-A2A,
1992-94 Town Car 4.6L F2VF-12B579-A2A,
1992-94 Grand Marquis 4.6L F2VF-12B579-A2A,
Evidently the –A1A, -A2A, AA, etc. on the end of the part number is a minor variant that did not change the operating specs. You should be able to ignore it and have everything work good.
 

bgdowski

Member
Jan 11, 2007
62
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Daytona Beach, FL
Great! thanks for the advice. I went back to my stock #19's and picked up a MAF from the local auto parts store. It runs like a champ. Now that i already have the C&L MAF and #36's, can i tune for them easily without a dyno? (I have a wideband sensor)
 

2000xp8

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Aug 8, 2003
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Great! thanks for the advice. I went back to my stock #19's and picked up a MAF from the local auto parts store. It runs like a champ. Now that i already have the C&L MAF and #36's, can i tune for them easily without a dyno? (I have a wideband sensor)

Don't use the C&L period, sell it on ebay.
And why do you want to use 36lb injectors?

A properly setup mass air car needs little to no tuning, at all.
 

bgdowski

Member
Jan 11, 2007
62
0
6
Daytona Beach, FL
My motivation for the large injectors is the vortech blower sitting on my workbench... But im having fitment problems (due to it being in a ranger, and not a fox) so it will more than likely end up on the classifieds shortly if a solution is not found.
 

2000xp8

SN Certified Technician
Aug 8, 2003
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My motivation for the large injectors is the vortech blower sitting on my workbench... But im having fitment problems (due to it being in a ranger, and not a fox) so it will more than likely end up on the classifieds shortly if a solution is not found.

Well, if you do get it to fit, use a PMAS meter. A c&l is a crappy meter to begin with, the sampling tube system is horrible, then add a supercharger into the mix and it's a recipe for disaster.