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Re:Hesitation/stumbling (whatever you want to call it (1 viewing)
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TOPIC: Re:Hesitation/stumbling (whatever you want to call it
#4260
GTsetGO (User)
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Hesitation/stumbling (whatever you want to call it Apr/29/2008 19:54  
Well, i am trying to diagnose what the hell is wrong with my car. I have cleaned the maf, iac, new plugs, new tps. there is a hesitation (stumbling) when i am doing an easy acceleration or just maintaining a certain speed. but under a quick accel (WOT) the car does fine.

also i notice that when the car hesitates, my fuel pressure guage tends to bounce around as well. any thoughts??

http://s307.photobucket.com/albums/nn286/gtsetgo/mustang/?action=view¤t=HPIM0553.flv

http://s307.photobucket.com/albums/nn286/gtsetgo/mustang/?action=view¤t=HPIM0554.flv
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#4261
DTPracing (Admin)
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Re:Hesitation/stumbling (whatever you want to call it Apr/30/2008 08:31  
fuel pressure seems very irradic, have you changed the fuel filter lately?
Frank

Co-owner, Dyno Tuned Performance, Inc.
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#4265
GTsetGO (User)
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Re:Hesitation/stumbling (whatever you want to call it May/01/2008 13:16  
i replaced the fuel filter about a year and a half ago when we put the new fuel pump in.

some suggested of that i do a resistance test on my COP's. my haynes book says that the primary resistance should be .5 ohms and the secondary resistance should be 5.5K ohms.

I used my ohm meter and got the following #'s on my COP's:

1P - .8
1S - 5.5K

2P - .7
2S - 5.48K

3P - .7
3S - 5.49K

4P - .8
4S - 5.48K

5P - .8
5S - 5.59K

6P - .8
6S - 5.43K

7P - .8
7S - 5.44K

8P - .8
8S - 5.45

so what do i gather from this?
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#4266
DTPracing (Admin)
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Re:Hesitation/stumbling (whatever you want to call it May/01/2008 19:23  
that looks OK, I still say that it is something with your fuel. I watched your vid links and the fuel pressure seems low and irradic.
Frank

Co-owner, Dyno Tuned Performance, Inc.
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