Misfiring

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Roger_4.6_96

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Jul 16, 2002

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Reno,NV

May 30, 2005

#1

• May 30, 2005

• #1

I have new plugs and wires with small missfire. What else could cause me to misfire ? Coilpacks have 100k miles on them. Could it be fuel injector or something fuel related ? Any help will be appreciated.

 

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bdcardinal

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Jun 10, 2003

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santa barbara, CA

May 30, 2005

#2

• May 30, 2005

• #2

any codes thrown? what does your O2 sensor voltage look like on a DSO? have you used and ful injector cleaner? could be the coil packs going.

 

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Roger_4.6_96

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May 30, 2005

#3

• May 30, 2005

• #3

No codes thrown at all . I got one new 02 sensor in the front.

It seems to only misfire when it gets warmed up

 

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bdcardinal

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Jun 10, 2003

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santa barbara, CA

May 30, 2005

#4

• May 30, 2005

• #4

what kind of plugs did you use? did you use antiseize and torque them? did you recheck the torque?

 

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Roger_4.6_96

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Jul 16, 2002

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May 30, 2005

#5

• May 30, 2005

• #5

bdcardinal said:

what kind of plugs did you use? did you use antiseize and torque them? did you recheck the torque?

Click to expand...

You mean the gap ? There suppost to be gapped from the factory. I used ford plugs the platinum ones. I check the gap on one of them it was 52. I had a hard time getting them out so i havent checked the other ones yet.

I forgot to mention everything ran cool til i 175 miles.

 

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bdcardinal

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Jun 10, 2003

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santa barbara, CA

May 30, 2005

#6

• May 30, 2005

• #6

no i dont mean the gap. when you put them in what did you torque them down to. or did you just put them in hand tight? when i install plugs on mod motors i usually torque them to 180 in lbs.

 

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Roger_4.6_96

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May 30, 2005

#7

• May 30, 2005

• #7

i dont have a torque wrench.

 

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bdcardinal

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Jun 10, 2003

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santa barbara, CA

May 30, 2005

#8

• May 30, 2005

• #8

then dont work on your car. a torque wrench is essential when working on your car. i have 5 torque wrenches personally, and i know some techs that have about 15, all different kinds.

very few people i know can work without a torque wrench, but theyve been doign it forever and know what their strength is. but they also use a torque wrench on almost everything.

 

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Roger_4.6_96

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Jul 16, 2002

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May 31, 2005

#9

• May 31, 2005

• #9

Ttt

 

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Roger_4.6_96

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Reno,NV

May 31, 2005

#10

• May 31, 2005

• #10

My fuel pressure is 34 psi when the car is turned on. Is my stock GT Fuel pump and tank enough for Cobra ?

 

9646gt

Member

Apr 7, 2005

595

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Holloman AFB,NM

May 31, 2005

#11

• May 31, 2005

• #11

Someone with more knowledge will have to chime in on the fuel requirements for the cobra swap as ti does have 2 more valves per cylinder ...but does it do it at WOT? if it does it is most likely not a sensor as most sensors are ignored at WOT ..

 

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Roger_4.6_96

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Jul 16, 2002

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May 31, 2005

#12

• May 31, 2005

• #12

9646gt said:

Someone with more knowledge will have to chime in on the fuel requirements for the cobra swap as ti does have 2 more valves per cylinder ...but does it do it at WOT? if it does it is most likely not a sensor as most sensors are ignored at WOT ..

Click to expand...

Well i noticed that it would do it if i was low on gas. I filled her up half way and she seems fine now.

My GT radiator didnt have the fix. Could it be possible that it got hot and makes it mess up ?

 

9646gt

Member

Apr 7, 2005

595

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Holloman AFB,NM

May 31, 2005

#13

• May 31, 2005

• #13

Roger_4.6_96 said:

Well i noticed that it would do it if i was low on gas. I filled her up half way and she seems fine now.

My GT radiator didnt have the fix. Could it be possible that it got hot and makes it mess up ?

Click to expand...

not sure wich fix you are talking about in terms of the radiator...but it sounds liek your pump is really having trouble keeping gas to the motor...I never let mine get below a quater of a tank if I dont half to jsut becuase I have always heard its good to keep the pump submerged?