mustang with a miss

M

mean4.6

New Member

Nov 6, 2008

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Nov 6, 2008

#1

• Nov 6, 2008

• #1

i have a 96 mustang 4.6 it has 90,000 miles and it recently started to miss real bad so i put new coils, plugs, and wires it solved the problem for about 25 miles then it started the same stuff again anyone have an idea of what my problem could be?

 

98COBRA281

10 Year Member

Nov 24, 2007

1,348

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59

Port St. Lucie, Florida

Nov 6, 2008

#2

• Nov 6, 2008

• #2

my buddy has a small coolant leak from his manifold, and after a month or so, it gets water down in the spark plug hole, and it will miss.........

 

M

mean4.6

New Member

Nov 6, 2008

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Nov 6, 2008

#3

• Nov 6, 2008

• #3

it only does it under a load or at wide open throttle. if you roll into it it hessitates a very little but then its fine and works like its supposed to

 

M

mean4.6

New Member

Nov 6, 2008

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Nov 6, 2008

#4

• Nov 6, 2008

• #4

anymore ideas this is my dd i need it back asap

 

M

mean4.6

New Member

Nov 6, 2008

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Nov 7, 2008

#5

• Nov 7, 2008

• #5

bump

 

02nightmaregt

To hell with your Mustang, I want to see your HOG!

Jul 1, 2007

513

4

19

Southern Indiana

Nov 7, 2008

#6

• Nov 7, 2008

• #6

It could be o2 sensors. I thought i had a miss a while back but it was just my upstream o2 sensors going out

 

M

mean4.6

New Member

Nov 6, 2008

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Nov 7, 2008

#7

• Nov 7, 2008

• #7

i replaced the downstream just before i got on here and it helped a litlle but still does it im totally lost

 

M

mikeyskd

New Member

Oct 29, 2008

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Nov 7, 2008

#8

• Nov 7, 2008

• #8

i would check the intake manifold if it doesn't have the aluminum crossover. i had an cracked intake and it was bogging down my motor. look for leaks under the intake manifold and like someone said before check the spark plug nearest the thermostat for coolant.

other than that, try cleaning the IAC on the throttle body with carb cleaner.

mike

 

Big Show 96

New Member

Oct 26, 2008

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Louisiana

Nov 7, 2008

#9

• Nov 7, 2008

• #9

mean4.6 said:

it only does it under a load or at wide open throttle. if you roll into it it hessitates a very little but then its fine and works like its supposed to

Click to expand...

I had the same problem with my 96 and after going thru a couple sets of spark plug wires the problem was solved. Not to rule out the cracked intake. These cars are very sensitive to water around the spark plug ports.

 

M

mean4.6

New Member

Nov 6, 2008

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Nov 9, 2008

#10

• Nov 9, 2008

• #10

ill take a look hopefully that is it i have tried everything. and also just tonite it backfired through the intake any ideas on that

 

fast97gt

Active Member

Jan 2, 2007

1,082

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49

north carolina

Nov 9, 2008

#11

• Nov 9, 2008

• #11

definitly sounds like your upstream o2 sensors, question though, any codes. because o2 sensors will definitly throw codes. but im like the others, ive had the intake prob. and its no fun. easy to change but rather expensive.

 

F

FordTard

New Member

Oct 30, 2008

17

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Orlando

Nov 9, 2008

#12

• Nov 9, 2008

• #12

1. Drive to Autozone of discount or what ever is close to you.
2. Have them scan your OBD II for free
3. If you have codes start trouble shooting from there.
4. it may be your MAF so you can clean that. be CAREFUL doing this because the coating is sensitive so you do not want to use brakeclean or anything like that. you should be safe with carb cleaner or some places carry MAF cleaner

 

P

poindexternasty

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Apr 29, 2008

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Nov 11, 2008

#13

• Nov 11, 2008

• #13

ditto upstream sensors, I just replaced mine and problem missing and hesitation went away... $32 each at RockAuto dot com. Swap your fuel filter while you are at it

 

P

poindexternasty

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Apr 29, 2008

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Nov 11, 2008

#14

• Nov 11, 2008

• #14

FordTard said:

1. Drive to Autozone of discount or what ever is close to you.
2. Have them scan your OBD II for free
3. If you have codes start trouble shooting from there.
4. it may be your MAF so you can clean that. be CAREFUL doing this because the coating is sensitive so you do not want to use brakeclean or anything like that. you should be safe with carb cleaner or some places carry MAF cleaner

Click to expand...

Do NOT use carb cleaner on your MAF under any circumstances.

Buy Electrical Parts Cleaner.... like $5 for a can an AutoZone. ONLY use electrical cleaner... it doesn't leave any residue on the MAF that would mess with it. The MAF is very sensitive... don't break it, they are expensive.

You had the right idea about the o2 sensors but your replaced the wrong ones.... you should have swapped the upstream. Your fuel economy will improve and the hesitation should stop. Mine were ash-gray when I pulled them out.

My 02 GT vert w/ 100k miles had no codes but after I swapped the sensors it ran a lot better.

 

B

blubullett

Member

Jun 22, 2006

535

6

18

Modesto, CA

Nov 11, 2008

#15

• Nov 11, 2008

• #15

Mine was doing that and it was the throttle position sensor. Works great now.

 

fast97gt

Active Member

Jan 2, 2007

1,082

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49

north carolina

Nov 12, 2008

#16

• Nov 12, 2008

• #16

TPS would only do it under acceleration, +1 up on the carb cleaner dont even think about it, they make a maf cleaner for like 7 bucks, do it