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1979-2004 V6 Mustang Tech Discussions

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Unread 11-08-2010   #1 (permalink)
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Default 1994 Mustang Computer replacement

I have just been inducted into newer Mustang ownership. I received a 1994 Mustang V6 5 speed all torn apart. The person i gt it from said it smokes severly and was planning on doing heads. I got this thing for a song. I bought a wrecked 1998 for parts and transplanted the engine to the 94. Here is the problem. The car stilll smokes like a freight train. #5 injecter is hung wide open. I unplug it and the car has a skip but no smoke. This motor ran great in the 98. Do i chase the computer thinking this is 1 of the only pieces left from the 1994 (except upper intake) or are there any other ideas on what to go after. Any input would be appreciated. Also I am working on a tight budget so if anyone has an ECM leftover from a V6-V8 swap I would be more than interested in an economical used 1.

I have a couple older Mustangs and do love my Fords........
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Unread 11-09-2010   #2 (permalink)
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first check the wiring you have a short for that injector.. this could be in the wiring harness or in the computer.. get friendly with an ohmmeter, fix that and you should have a nicely running mustang
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2003 3.8L V6 4R70W
Windstar Upper Intake with cool-air intake, MAC LT headers, BBK O/R H-pipe, and flow 40s, SCT tuner, FRPP Alum. D/S, 3.73 gears, Auburn HP limited slip, and Team Z LCAs, Eibach sway bars.
Best 1/4 time: 15.036 @90.92mph, 2.148 60'
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Unread 11-10-2010   #3 (permalink)
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I really appreciate the quick response I have ohm'd from pins to inj and narrowed this out. I do believe the short is in the ECM. I would love to know a way to pinpoint this 100%. Is there anything else could cause the running rich smoke? From thr original car/engine I have used the ecm,egr valve, MAF o2 sensors, an dtemp and fan relay sensors. Is there any of these that could be the culprit? I am almost ready to spend the 200+ dollars to buy the ECM but really would like a little more input. Once bought the ecm is non returnable.
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Unread 11-14-2010   #4 (permalink)
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Just to keep you informed. After hours of tracing injecter leads back to pins with a Haynes manual and ohm meter. I bought a used ECM. As soon as the computer was installed the smoke got lighter and throttle response improved significantly. I have also replaced the mass air flow sensor and have a very nice running car. Mass air flow replacement brought the throttle response back to 100%. I guess all there is to do now is drive & enjoy.
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Unread 11-15-2010   #5 (permalink)
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excellent.. chasing down electrical problems is a pain.. glad you figured it out.. enjoy!
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2003 3.8L V6 4R70W
Windstar Upper Intake with cool-air intake, MAC LT headers, BBK O/R H-pipe, and flow 40s, SCT tuner, FRPP Alum. D/S, 3.73 gears, Auburn HP limited slip, and Team Z LCAs, Eibach sway bars.
Best 1/4 time: 15.036 @90.92mph, 2.148 60'
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Unread 11-15-2010   #6 (permalink)
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+1 I hate electronics cuz I can't "see" what's going on!! Glad you got things fixed.
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FLASH = 98 V6, chrome yellow, black & blue accents, 146k daily driver
POWER: divorced exhaust with glasspacks; BBK CAI, TB, UDPs; (shift kit in the garage)
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RIMS: XXR 006 black spoke with blue lip; 18x8.5 front, 18x9.5 rear
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