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Discussion Starter · #1 ·
Okay.... I just bought a 96 Tbird Last week runs absutely fine. I get it home and the check engine light comes on. So I throw it on a scanner and it comes up with comes up with two codes, 171 and 174. These caodes are for bank 1 and 2 running lean because HEGO (Heated Exhaust Gas Oxygen sensor) is switching to slow. I kinda got an idea for that problem so on to the next ine..... While driving the car will not respond to WOT. If you press the gas peddle hard enoug to get a down shift it won't respond. Whats known to cause this problem? If it was a 5.0 I would blame the kickdown cable or TV grommet but.... its a completly computer controlled 4.6 so I'm kinda lost in the sauce!!!
 

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If the MAF is dirty it can throw a bank 1-2 code.Try cleaning it and see what happends.
 

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Yes. Test the voltage between the bottom and middle wire at the sensor while the car ignition is set to on. The car doesn't necessarily have to be running. The voltage should be below or near 1 volt and should increase smoothly as you open the throttle. Any spikes or erratic voltage readings will indicate a faulty TPS.
 

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Hey Joe, here is an article that goes into detail on testing and adjusting the TPS:

TPS Adjustment/Checking

And if you go up to advance or autozne you can pick up a bit set of tamper proof torx bits for like 10 bux. Comes in handy and it's money well spent.

I would clean the MAF first, cheapest and easiest.
 

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Discussion Starter · #10 ·
Im shocked....I cleaned the MAF and now the car feels better from every angle!!! Throttle response is great now and feels so much more powerful. Im not trying to start are flame wars but....the 4.6 is way better then the 5.0. I had a 92 sport and loved it but I love the 96 so much more its sicking to me that I ever had a 5.0.
 

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Im shocked....I cleaned the MAF and now the car feels better from every angle!!! Throttle response is great now and feels so much more powerful. Im not trying to start are flame wars but....the 4.6 is way better then the 5.0. I had a 92 sport and loved it but I love the 96 so much more its sicking to me that I ever had a 5.0.
I told you so!!! 4.6 OWNZZZ!!!! lol

:tongue:
 

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Discussion Starter · #13 ·
So... cleaning the MAF helped but I still have the CEL on and the car has to get echecked really soon. So I read that there is 4 HEGO sensors which one would i want to replace.... I got a code saying both banks were lean... isnt there a tune I can get that would turn off the back two o2 sensors... what else is required for a tune dont you have to get different plugs abd a higher temp thermostat...
 

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Yes there are 4 o2 sensors. The two upstream are the ones that matter. The secondarys are only there to make sure the cats are present and working. And yes they can be turned off via a tune.

A basic tune consists of getting one step colder plugs (Autolite 103's), a 180* T-Stat (cooler) and an 80mm Mustang GT MAF sensor. That allows the car to run with more advanced timing which = power. Plus it removes all the crappy retards/limiters, firms up shifts and gives it a better TC lockup schedule.

Your codes are saying your running lean, that doesn't mean you need new o2 sensors. But you can check to make sure they are switching properly by pulling up the data on a scan tool. The o2's should switch back and forth between .1 volts and .9 volts.

Did you reset the computer after cleaning the MAF? That is a must. I have a feeling you have a vacuum leak somewhere. Take a can of carb cleaner and spray all over the place. If you hit a vacuum leak, the rpms will raise a little and start running rough.

Running lean means that you have to much air and not enough fuel. You just have to find the reason why. A vaccum leak is a good suspect because that means unmetered (its coming in after the MAF) air is getting sucked into the engine and the computer has no idea. So it thinks it is running like normal. But you o2 sensors noticed that there was to much air in the mixture and triggered the CEL. The computer can only add so much fuel to try and correct it. But obviously it isn't enough. I bet your fuel trims are up real high.

What do your plugs look like? Replace them yet?

How about the wires? Fuel filter? PCV clogged?

Get to work buddy!! lol
 

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Discussion Starter · #16 ·
You see.... My car has been in the body shop for awhile getting fixed after being hit after 3 days of owning it. Then I get it back and Cleveland forgot it was spring and started snowing..... So I havent had much time with my car ya see. Where would I get this MAF. I want to wait til I get the tune to change plugs and all that madness. When I do an oil change to this car would you recommend mobil1 or does it really not matter?
 

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check your tps sensor and front 02 sensor first. but if you are sure the maf sensor is bad you can have mine 96 sensor for cheap, and i mean really cheap. let me know. o2 sensor i can't help you to check but the tps sensor you can check. once positive tps sensor is good and you need the maf sensor let me know.
 

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Discussion Starter · #18 ·
Naw thatnks man but Im going to use this as a chance to upgrade and getsome performance, thats kinda the reason i went to the 4.6 over the 5.0. But really thanks for the offer. Could anyone tell me if synthethic oil makes a difference on our cars?
 

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Naw thatnks man but Im going to use this as a chance to upgrade and getsome performance, thats kinda the reason i went to the 4.6 over the 5.0. But really thanks for the offer. Could anyone tell me if synthethic oil makes a difference on our cars?
Good idea!

I have been using synthetic for the last 45k. You won't "feel" a difference or anything. But it is better than traditional oils (better for the seals, cleans and lubricates better). But once you start using it, its a good idea to keep on using it.

Especially knowing the fact that your bird has low miles, it wouldn't be such a bad idea to switch to synthetic. Mobil 1 is the way to go.

Ford put out a TSB and now recommends using 5w20 in all Ford vehicles (better gas milage supposedly).
 

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my grandparents 96 grand marquis with a 4.6 was doing the same thing so i suspected it was the maf. i took the car out to the country and unplugged the maf (it will want to die at idle) but i put the pedal to the floor and it ran awesome...i guess what im saying is try unplugging the maf because cleaning it does not always work
 
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