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Author
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Topic: Need help from fellow San Josenian
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BlueLightning302
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Member # 3974
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posted
 
 
basically, the car begins to hesitate when i gas it. it idles perfectly though. it will hesitate even at WOT. not always though sometimes it runs perfectly too. i cleaned out the salt and pepper plugs, the spark plugs are new, changed them twice actually, spark plug wires are perfect (new), new cap (3 different ones), new rotor (2 different ones). I tried a different TFI, same thing. no vacuum leaks. the only codes that come up are the same ones that have that have been there for years (removed smog pump) that have never given me problems. if it were a sensor, what sensors work during WOT? maybe coil? maybe fuel filter? fuel pump? I do have a fuel pressure gauge but its only located under the hood (schrader valve). i was wondering if there were any people in the san jose area with a MAF calibrated to 24#'s that would let me test it out on my car to see how it would run.
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Originally Member #935
2003 Mustang Cobra - Some mods
"Well, atleast the slow one's trying!!" - Al Bundy
Posts: 207 | From: San Jose | Registered: Jan 2004
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JohnB
Tech Moderator
Member # 969
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posted
Unplug your MAF, then drive it. Pretty sure that'll solve your problem. Betcha it's dirty. ![[Smile]](smile.gif)
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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BlueLightning302
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Member # 3974
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posted
actually i cleaned it because the way it was running and it still did nothing.
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Originally Member #935
2003 Mustang Cobra - Some mods
"Well, atleast the slow one's trying!!" - Al Bundy
Posts: 207 | From: San Jose | Registered: Jan 2004
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BlueLightning302
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Member # 3974
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posted
ran a fuel pressure gauge outside, fuel pressure was perfect during hesitation. checked TFI, tested bad so changed that. still hesitating. now what?
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Originally Member #935
2003 Mustang Cobra - Some mods
"Well, atleast the slow one's trying!!" - Al Bundy
Posts: 207 | From: San Jose | Registered: Jan 2004
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BlueLightning302
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Member # 3974
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posted
TPS voltage sweeps fine. anything else?
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Originally Member #935
2003 Mustang Cobra - Some mods
"Well, atleast the slow one's trying!!" - Al Bundy
Posts: 207 | From: San Jose | Registered: Jan 2004
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DropTopFox
drama
Member # 1689
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posted
quote:
Originally posted by BlueLightning302:
actually i cleaned it because the way it was running and it still did nothing.
what did you clean it with, that MAF is sensitive as all hell, a little oil/grease anything on it will throw you off big time. ![[patriot]](graemlins/patriot.gif)
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Go out and do something for yourself today everyone, quit depending on others
-Me
http://www.CaliforniaFords.com/cgi-bin/album.pl?album=00001689
Posts: 4003 | From: San Bruno | Registered: Aug 2002
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BlueLightning302
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Member # 3974
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posted
i used electrical parts cleaner. any other suggestions guys??
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Originally Member #935
2003 Mustang Cobra - Some mods
"Well, atleast the slow one's trying!!" - Al Bundy
Posts: 207 | From: San Jose | Registered: Jan 2004
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