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Old 01-12-2013, 06:24 PM   #1
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96 GT dying when braking

Hey guys I need help. I have a 96 GT automatic. It doesn't do this all of the time it just does it every once in a while. My car dies when you are braking. I am stumped by this and cannot tell what the problem is. I took it too a transmission shop and they also couldn't tell me. I replace the iac, the camshaft position sensor. Any other ideas I'm at a loss

Thanks in advance
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Old 01-12-2013, 06:37 PM   #2
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maybe maf sensor ?
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Old 01-12-2013, 06:42 PM   #3
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Vacuum leak
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Old 01-12-2013, 07:13 PM   #4
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I've replaced the maf. And where is the most common places where a vacuum leak is located?
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Old 01-12-2013, 10:39 PM   #5
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I've replaced the maf. And where is the most common places where a vacuum leak is located?
Any mods you have done?
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Old 01-12-2013, 10:40 PM   #6
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No it's bone stock. I'm waiting to mod until after I figure out the problems
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Old 01-12-2013, 10:44 PM   #7
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No it's bone stock. I'm waiting to mod until after I figure out the problems
You haven't changed anything at all? No cai or anything?

Easiest way to find a vacuum leak is get carb cleaner and spray around the intake and vacuum lines. But it can be tricky since yours is doing it while braking. What about sitting still and hitting the brake? Does it die then?
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Old 01-12-2013, 10:55 PM   #8
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Since its dying while braking id say brake booster ....however we have a hydroboost so not an option. However i agree i would spray carb cleaner and listen for a rev up pr death of the motor.
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Old 01-13-2013, 12:42 AM   #9
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The first problem was taking it to a transmission shop go to a mechanic. Unless you feel the transmission roughly downshift
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Old 01-13-2013, 01:16 AM   #10
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Well I thought it was a transmission problem because it felt like it was pulling while I was braking. But to no avail. While its at an idle it runs fine. It only dies when I'm driving and coming to a stop. The weird thing is though that it doesn't do it at every stop. It only does it once in a while.
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Old 01-13-2013, 01:26 AM   #11
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Originally Posted by 96GTstang View Post
Well I thought it was a transmission problem because it felt like it was pulling while I was braking. But to no avail. While its at an idle it runs fine. It only dies when I'm driving and coming to a stop. The weird thing is though that it doesn't do it at every stop. It only does it once in a while.
Clean the MAF, IAC, and throttle body. Also a loose battery connection can cause what your describing. My v6 used to do that and come to find out I had a bad cable that was loosing connection.
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Old 01-13-2013, 01:30 AM   #12
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Replaced maf and iac. Ill clean the throttle body in the morning. And I'll check for a bad connection
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Old 01-13-2013, 04:29 AM   #13
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Originally Posted by 96GTstang View Post
Well I thought it was a transmission problem because it felt like it was pulling while I was braking. But to no avail. While its at an idle it runs fine. It only dies when I'm driving and coming to a stop. The weird thing is though that it doesn't do it at every stop. It only does it once in a while.
My 98 does that too, but only after I had hauled *** real fast to a red light then it would die on me but I still don't know why mine does it
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Old 01-13-2013, 10:30 AM   #14
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Really confusing!
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Old 01-13-2013, 10:42 AM   #15
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Vacuum leak
+ 1 happened to my mamaws crown Vic
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Old 01-13-2013, 10:47 AM   #16
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Is your check engine light on?
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Old 01-13-2013, 11:56 AM   #17
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No check engine light isn't on.
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Old 01-13-2013, 03:39 PM   #18
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If the light isn't on I don't think it would be a vacuum could be a blockage or pinched brake line. Check the fluid to see if you see any contaminants inside.
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Old 01-13-2013, 04:08 PM   #19
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Alright when it stops raining ill do that.
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Old 01-13-2013, 08:41 PM   #20
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I would still look for a leak like vacuum leak or a cracked manifold
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o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 01-13-2013, 09:45 PM   #21
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Yea I'm gonna check all of that!
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Old 01-14-2013, 11:13 PM   #22
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This happend on an 89 mustang I had years ago. It was the throttle position sensor.
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Old 01-14-2013, 11:57 PM   #23
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This happend on an 89 mustang I had years ago. It was the throttle position sensor.
Ill buy one when I get out of class tomorrow and let you know how it works out. Thanks a lot.
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Old 01-15-2013, 08:46 AM   #24
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I would still look for a leak like vacuum leak or a cracked manifold
....there's no such thing as a "vacuum leak" lol. How can you Leak vacuum! Compression loss maybe or something alike but no such thing as a vacuum leak lol
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Old 01-15-2013, 10:51 AM   #25
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....there's no such thing as a "vacuum leak" lol. How can you Leak vacuum! Compression loss maybe or something alike but no such thing as a vacuum leak lol
I think he's saying something about a vacuum line being broken or cracked.
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Old 01-15-2013, 10:58 AM   #26
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I think he's saying something about a vacuum line being broken or cracked.
+1 then it sucks air from the leak bypassing the MAF and causing ECU problems with idle, etc.
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Old 01-16-2013, 05:19 PM   #27
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....there's no such thing as a "vacuum leak" lol. How can you Leak vacuum! Compression loss maybe or something alike but no such thing as a vacuum leak lol
Like Azure said.
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Old 01-17-2013, 12:13 AM   #28
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Like Azure said.
Then what is my problem.
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Old 01-17-2013, 01:37 AM   #29
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Nothin man. Just technically speaking lol. That's a definite possibility though
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Old 01-17-2013, 08:55 AM   #30
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Nothin man. Just technically speaking lol. That's a definite possibility though
So check for a leak. I've changed the other parts that have been referred. But too no help. Any other ideas?
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Old 01-17-2013, 03:23 PM   #31
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Vacuum leaks towards positive pressure i.e. atm pressure so it can be a leak in vacuum if its supposed to be maintained at say 25hg vacuum but leaks out to atmosphere then its a leak. Now that im dine ranting lol have u checked your tps sensor. It may be possible that the throttle sensor is doing it as well. We have so far eliminated iac due to it being replaced however maf is still possible since it hasnt been changed but tps can cause it too. My guess maybe get a junkyard maf sensor from a crown vic or mark 8 if u are my years. I say mark 8 cause its the same maf as 96-98 just calibration to 24lbs. However ba k to the point its to eliminate things before we try to find a crack in the manifold witg a fog machine.

---------- Post added at 04:23 PM ---------- Previous post was at 04:22 PM ----------

Or buy a maf new try it then return it if it didnt work and get the money back
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o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.
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Old 01-17-2013, 04:48 PM   #32
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Vacuum leaks towards positive pressure i.e. atm pressure so it can be a leak in vacuum if its supposed to be maintained at say 25hg vacuum but leaks out to atmosphere then its a leak. Now that im dine ranting lol have u checked your tps sensor. It may be possible that the throttle sensor is doing it as well. We have so far eliminated iac due to it being replaced however maf is still possible since it hasnt been changed but tps can cause it too. My guess maybe get a junkyard maf sensor from a crown vic or mark 8 if u are my years. I say mark 8 cause its the same maf as 96-98 just calibration to 24lbs. However ba k to the point its to eliminate things before we try to find a crack in the manifold witg a fog machine.

---------- Post added at 04:23 PM ---------- Previous post was at 04:22 PM ----------

Or buy a maf new try it then return it if it didnt work and get the money back
Okay replaced tps this afternoon. Not a help. I'm thinking ill replace the maf this weekend. Have to wait for school to let out. I am only 18 so funds are also limited. Hahah. I might try the junkyard maf. We have a pull-a-part that I used to go to quite often. It helped familiarize me with engines. Thanks again for the feedback.
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