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Old 01-04-2011, 02:22 PM   #1
99MustangGT
Default Car Jerks While Accelerating

My car has been jerking while I accelerate with more than a 1/4 to 1/2 throttle from the low idle rpm's to about 4000 rpm, after that the acceleration feels smooth. The jerking seems to be caused by the power cutting out for just a part of a second.

I'm going to check plugs, maf, and the air and fuel filter.

Let me know if you think it's something else.
__________________
1999 Chrome Yellow Mustang GT
35th Aniversary 5-Speed
Mach 1 Grille Delete, Mach 1 Chin Spoiler, Smoked Headlights and Taillights, BBK CAI, HID's, H&R Super Sports
Future Mods:
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On3performance turbo kit
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Old 01-04-2011, 02:31 PM   #2
probiker427
Default

mine did the bucking and jerking and it ended up being the fuel pump so keep that in mind also
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Old 01-04-2011, 02:38 PM   #3
08mustang_gt
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IAC should be kept in mind too. Can cause some weird things sometimes.
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5-speed Manual
20x9.5 Shelby Razors with 275/35 NT555s

Current Mods:
Axle-Back Ford Racing Exhaust = Pypes O/R X-Pipe = Roush Short-Throw Shifter
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Old 01-04-2011, 02:40 PM   #4
TUFF 4.6
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Plugs and fuel filter with some Seafoam in case you have a little water in the tank.
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Old 01-04-2011, 04:22 PM   #5
01FR500
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I was thinking fuel filter. Could be a dirty MAF sensor, worn plugs, something like that.
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Old 01-04-2011, 06:27 PM   #6
99MustangGT
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Alright, I'll try everything listed tomorrow when there's light and report back.
__________________
1999 Chrome Yellow Mustang GT
35th Aniversary 5-Speed
Mach 1 Grille Delete, Mach 1 Chin Spoiler, Smoked Headlights and Taillights, BBK CAI, HID's, H&R Super Sports
Future Mods:
3.73 FRPP Gears
On3performance turbo kit
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Old 01-18-2011, 10:39 AM   #7
99MustangGT
Default

I ended up taking a look at the plugs and maf and they looked fine. I recently filled up my tank with premium gas, and after running on "E" all the time it seemed to improve. I'm going to change the fuel filter and run though some Seafoam, in hopes that it will fix my problem.
__________________
1999 Chrome Yellow Mustang GT
35th Aniversary 5-Speed
Mach 1 Grille Delete, Mach 1 Chin Spoiler, Smoked Headlights and Taillights, BBK CAI, HID's, H&R Super Sports
Future Mods:
3.73 FRPP Gears
On3performance turbo kit
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Old 01-18-2011, 11:16 AM   #8
01FR500
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Yup, still sounds like a fuel problem. Did you clean the MAF sensor? Even if it looks fine they can get dirt and oil buildup on them. I spray an electrical contact cleaner on mine every few months to keep it clean. Cheap, easy, and you'll know that it's not the problem. Change that fuel filter and I think you'll be good to go.
__________________
2003 GT
Torque Arm | MM Coilovers | Tokico Illuminas | Full Cobra Brakes | Front & rear brake ducts | MM c/c plates | MM XL SFCs | MM Adj. LCA | MM Panhard bar | MM Alum. rack bushings | X2 balljoints | Gears | JLT RAI | MGW shifter | Alum. 3 row boxed-in radiator | Poly bushings | Carbon fiber hood | Clutch mods | endless other goodies and a few appearance mods...
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Old 01-18-2011, 01:37 PM   #9
99MustangGT
Default

I looked at the maf and it looked clean. I have heard of using carb cleaner but have never tried it, does it work the same? I'll change the filter and do the seafoam treatment and let you know, probably tomorrow.
__________________
1999 Chrome Yellow Mustang GT
35th Aniversary 5-Speed
Mach 1 Grille Delete, Mach 1 Chin Spoiler, Smoked Headlights and Taillights, BBK CAI, HID's, H&R Super Sports
Future Mods:
3.73 FRPP Gears
On3performance turbo kit
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Old 01-18-2011, 06:37 PM   #10
TUFF 4.6
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Quote:
Originally Posted by 99MustangGT View Post
I recently filled up my tank with premium gas, and after running on "E" all the time it seemed to improve.
I know we have to do it sometimes but thats one of the worse things you can do.
Do the Seafoam now while the tank is full and you should be good to go.
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Originally Posted by rebelyell View Post
Bit her about 20 times and looked like speedy gonzalos while he was whoopin her ***.
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Old 01-19-2011, 08:54 PM   #11
3.8LMustang
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Get a fuel puressure guage and connect it to your fuel rail
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Old 01-20-2011, 05:51 PM   #12
99MustangGT
Default

I did the Seafom in the gas, vaccum, and oil yesterday and it seemed to improve, but it still didn't solve the problem. I have yet to change the fuel filter and I'll do it soon. One question though, should I buy it from Ford, an Autozone/Advance type filter, or an Amsoil/Royal Purple, which is best?

Where do you connect a fuel pressure gauge on the stock fuel rail?
__________________
1999 Chrome Yellow Mustang GT
35th Aniversary 5-Speed
Mach 1 Grille Delete, Mach 1 Chin Spoiler, Smoked Headlights and Taillights, BBK CAI, HID's, H&R Super Sports
Future Mods:
3.73 FRPP Gears
On3performance turbo kit
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Old 01-20-2011, 05:55 PM   #13
01FR500
Default

I just a get a motorcraft filter from a parts store. Just release the fuel pressure with the schrader valve on the fuel rail, if thats what your wanting the fuel pressure gauge for.
__________________
2003 GT
Torque Arm | MM Coilovers | Tokico Illuminas | Full Cobra Brakes | Front & rear brake ducts | MM c/c plates | MM XL SFCs | MM Adj. LCA | MM Panhard bar | MM Alum. rack bushings | X2 balljoints | Gears | JLT RAI | MGW shifter | Alum. 3 row boxed-in radiator | Poly bushings | Carbon fiber hood | Clutch mods | endless other goodies and a few appearance mods...
Driver Mod (work in progress)
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Old 01-20-2011, 06:11 PM   #14
TUFF 4.6
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Quote:
Originally Posted by 99MustangGT View Post
I did the Seafom in the gas, vaccum, and oil yesterday and it seemed to improve, but it still didn't solve the problem. I have yet to change the fuel filter and I'll do it soon. One question though, should I buy it from Ford, an Autozone/Advance type filter, or an Amsoil/Royal Purple, which is best?

Give it a little time and the rest of the tank full.

Where do you connect a fuel pressure gauge on the stock fuel rail?
Quote:
Originally Posted by 01FR500 View Post
I just a get a motorcraft filter from a parts store. Just release the fuel pressure with the schrader valve on the fuel rail, if thats what your wanting the fuel pressure gauge for.
Yeah, what he said.
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Quote:
Originally Posted by rebelyell View Post
Bit her about 20 times and looked like speedy gonzalos while he was whoopin her ***.
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Old 01-20-2011, 06:12 PM   #15
99MustangGT
Default

I figured I should just get the oem replacement, thanks.
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1999 Chrome Yellow Mustang GT
35th Aniversary 5-Speed
Mach 1 Grille Delete, Mach 1 Chin Spoiler, Smoked Headlights and Taillights, BBK CAI, HID's, H&R Super Sports
Future Mods:
3.73 FRPP Gears
On3performance turbo kit
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Old 01-20-2011, 06:12 PM
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