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Author
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Topic: Stuttering problem
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cobra_302_stang
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Member # 7257
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posted
 
 
I have a 04 Mach 1 with 86,xxx miles on it. It's pretty much stock, but it stutters sometimes while WOT throttle and while driving normal. I have changed spark plugs, fuel filter, cleaned air filter, mass air meter, TPS sense. Checked coil on plugs and they seem to work fine. No trouble codes. I can't find any vaccum hose disconneted. What should the fuel pressure be at idle and WOT? Any ideas or other things I should check. Thanks
[ December 10, 2009, 01:11 AM: Message edited by: cobra_302_stang ]
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~HighSpeed Motorsports~
Posts: 416 | From: Redwood city | Registered: Nov 2006
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stangin'
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Member # 514
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i know you said you check the coils visually, but did you actually swap them out for another set?
[ December 10, 2009, 01:37 AM: Message edited by: stangin' ]
Posts: 2993 | From: Bay Area | Registered: Oct 2001
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MarkOlson
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Member # 9556
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You always want 39 PSI between the fuel rail and the intake manifold.
Assuming you idle at about 20"Hg, which is about -10 PSI in the intake manifold, then you should see about 39-10=29 PSI of fuel pressure.
At WOT, your intake manifold pressure will be zero, so your fuel pressure should be about 39-0=39 PSI.
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Mark Olson
See http://www.classictiger.com/mustang for mods
Posts: 20 | From: San Jose | Registered: Oct 2009
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cobra_302_stang
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Member # 7257
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I checked the coils by unpluging them at idle and seeing if the motor would stutter and affect the idle which it did. So I'm assuming that they all are working.
At idle I do have 20 hg and at WOT it's at 0 hg. Fuel pressure at idle is 20 psi. and at WOT it goes to about 32 or 36 psi. I will double check to make sure what fuel pressure is at WOT. The car just stutter for two or three second then it just revs normal, when driving somethimes and at WOT.
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~HighSpeed Motorsports~
Posts: 416 | From: Redwood city | Registered: Nov 2006
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trickflow211
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Member # 8503
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my car had the same little throttle lag...i just used a bottle of seafoam and it got rid of the throttle lag, and it fixed my idle, and gave me way better throttle responce, not saying its going to work for you...but juss tryna help...=]
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1990 Cobra Clone 421 Tq 420 Hp
Need General Contractor Services? 925-338-5422 serving East Bay Area over 20yrs
Posts: 2449 | From: Pittsburg/Sacramento | Registered: Jul 2008
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cobra_302_stang
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Member # 7257
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Do you mean fuel injector cleaner. I have put Fuel Injector cleaner twice with full tanks but it still does it.
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~HighSpeed Motorsports~
Posts: 416 | From: Redwood city | Registered: Nov 2006
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Jdub07
( O Y O )
Member # 2728
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I used to be a seafoam lover and still think it is a pretty good product...but if you love your car get Restore AND some seafoam. Put the bottle of seafoam in your gas tank and the bottle of restore in the oil.
Posts: 7282 | Registered: Apr 2003
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trickflow211
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Member # 8503
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no not fuel injector cleaner, its called sea foam. it does wonders!!! =] hahaha. and j dubb i am going to try ur little mixture next time =]
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1990 Cobra Clone 421 Tq 420 Hp
Need General Contractor Services? 925-338-5422 serving East Bay Area over 20yrs
Posts: 2449 | From: Pittsburg/Sacramento | Registered: Jul 2008
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cobra_302_stang
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Member # 7257
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posted
Any other ideas?
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~HighSpeed Motorsports~
Posts: 416 | From: Redwood city | Registered: Nov 2006
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