94 mustang cobra code 172 - Muscular Mustangs
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post #1 of 15 Old 10-17-2010, 11:00 PM Thread Starter
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94 mustang cobra code 172

Hey everyone I was working on my 1994 mustang cobra and from all different codes I had this is the one that wont clear its 172 and when I checked the book for description it said something about the o2 sensor bank 1 so I replaced that now its running a bit better but still very rough no power on accelaration anyways the code is still coming back on any ideas what the heck to change next?the cel will come on sometimes while driving then go off its a obd1 so i cant figure this thing out at all any suggestions will be appreciated... .]

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post #2 of 15 Old 10-18-2010, 12:21 PM
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Re: 94 mustang cobra code 172

Code 172 means that O2 sensor is reading lean (too much air, too little fuel). Unfortunately there are numerous things that could cause this. First thing I'd check for is a vacuum leak. Also just for the heck of it try cleaning the wire on the MAF sensor wire (instructions). If those two don't work out then I'd probably try checking the fuel pressure next, though you'll need to bring it to your mechanic if you dont have a fuel pressure gauge.
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post #3 of 15 Old 10-18-2010, 06:47 PM Thread Starter
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Re: 94 mustang cobra code 172

Thanks Mike that is helpful I just noticed that the egr valve selonoid on this car is connected straight to the intake manifold vacum tube isnt it suppose to be connected to a valve preasure sensor or something like that I recently looked at some schematics and it looks like its connected to a sensor first then from senso it goes back to intake vacum also this car is equiped with the upper and lower trickflow intake manifolds and I see that alot of the vacum hole openings are plugged with caps is that normal? the deeper I go with it the more I find but I guess thats good, I also think maybe replacing a fuel filter just to make sure its working good.

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post #4 of 15 Old 10-18-2010, 08:49 PM Thread Starter
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Re: 94 mustang cobra code 172

also does anyone out there have a plain picture of all the vacum line connections or possibly a picture of a 94 mustang cobra intake manifold and which vacum line goes where? I would greatly appreciate help on that so I can make sure it has everything connected when I bought the car it didnt have the EGR valve and alot of the vacum lines were not on the car so its really hard to trace all of them now and guess whats missing... thanks a bunch again for any info or pictures

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post #5 of 15 Old 10-18-2010, 08:51 PM
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Re: 94 mustang cobra code 172

I can't remember exact where the line from the egr leads to but I think you may be right about it leading elsewhere before the manifold. As for the caps on the manifold it's possible that the previous owner removed some of the emissions stuff which is why there are caps instead of lines going to those fittings. As long as theyre not leaking you should be fine.
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post #6 of 15 Old 10-18-2010, 10:32 PM Thread Starter
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Re: 94 mustang cobra code 172

No they are brand new caps you can tell for sure that they are now if I perform a engine vacum test would that indicate a leak anywhere on the engine? I know that mustangs are suppose to be at like 20 pounds of vacum.... everytime I accelarate the car shakes like its not running on all 8 cylinders this one got me confused because I replaced the distributor cap and rotor plug wires sparks so what else is left on the ignition side when its cold it takes some time to start it cranks nice and smooth just doesnt start as fast as I think it should be Im talking about like 4-6sec of cranking any ideas if this is connected also to the shaking of the engine on low rpms even when its at idle it shakes, timing is set at 12* are there any more parts to ignition that control the amount of spark at accelaration? thanks for all your suggestions I wont give up on the car since it is a original owner car and I love it so wont give it up because of some small problems i know its fixible

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post #7 of 15 Old 10-19-2010, 12:00 AM
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Re: 94 mustang cobra code 172

I really don't think it's ignition related. That trouble code indicates a lean condition which is probably either a fuel problem or a vacuum leak. It could also be the maf reading incorrectly which is why I recommend cleaning it.
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post #8 of 15 Old 10-19-2010, 12:53 AM Thread Starter
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Re: 94 mustang cobra code 172

will definetly clean the maf this weekend, this might be a crazy question but a guy in a shop told me to set my gap for sparks at .034 now when I checked the standard for 94 ford mustang cobra its at .054 would that make my car run like crap? what is the gap space mainly for does it make any difference at what its set?

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post #9 of 15 Old 10-19-2010, 11:36 PM
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Re: 94 mustang cobra code 172

The factory setting is .052 to .056 but I've known quite a few guys who run it around .035 Honestly I doubt you would notice a difference either way. I think the only time its really needed to goto a smaller plug gap is with a power adder like nitrous.
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post #10 of 15 Old 10-23-2010, 10:41 PM Thread Starter
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Re: 94 mustang cobra code 172

Ok so I think I finally found the issue I end up replacing a vacum regulator in the right fender and its running soo much better still not 100% but getting closer and the check engine light hasnt come on yet so we'll see, would you know how to correctly adjust the small screw on the throtle body right next to the IAC sensor not the idle stop screw but the one in the throtle body under a small rubber seal that can be taken off I accidently messed with it and now I think its not in the right position, like I said its right next to the IAC to the left of the sensor on top of the throtle body once that is taken care of I should be burning tires again on it

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