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Author
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Topic: Help! Fuel Pressure Regulator or Fuel Pump Bad??
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Teddy Tiger
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Member # 2473
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posted
 
 
Would a bad pressure regulator or fuel pump cause my wierd idle and the slight roughness around 2500 rpm?
I checked my fuel pressure today, 28psi Vacuum line on, around 38 with the line detached. Also, it seemed the needle went *down* when I gunned it then rose to normal.
Any suggestions?
Nick
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2008 Mustang GT 'Premium'
Vista Blue Metallic
Interior Upgrade, Comfort Group
Charcoal Leather Interior
Shaker 500 Stereo
Posts: 167 | From: Lafayette, California | Registered: Feb 2003
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Mudflap Militia
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Member # 2922
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posted
[ June 13, 2003, 04:11 PM: Message edited by: st5150 ]
Posts: 40 | From: Up Sawsons ass | Registered: Jun 2003
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Sean90GT
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Member # 33
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posted
When you gunned it and you saw the fluctuation was it with the vacuum line on or off?
Have you tested your vacuum pressure? You may have a leak. That could cause a poor idle and hesitation.
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Currently Mustang-less...
Posts: 543 | From: Then: San Jose, CA Now: Phoenix, AZ | Registered: Jul 2000
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FordPny
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Member # 510
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posted
quote:
Originally posted by Sean90GT:
When you gunned it and you saw the fluctuation was it with the vacuum line on or off?
Have you tested your vacuum pressure? You may have a leak. That could cause a poor idle and hesitation.
We tested it at my house,
It flutctuated with the vacuum line on.
No he hasnt tested vacuum pressure.
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Holla at yoo boooyyy
Posts: 2458 | From: San Jose CA | Registered: Oct 2001
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Primer GR40
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Member # 476
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posted
quote:
Originally posted by Mudflap Militia:
te both broken, s i suggest youdo what i do with broken parts and just put them in your bum bum!
First put em in your bum bum. then mess with your FPR to see if it will raise and lower the FP. also if there is a slight drop check your fuel filter.
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Superdupercharged Cobra
No Transmatic Notch
Posts: 2108 | Registered: Sep 2001
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Teddy Tiger
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Member # 2473
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posted
It has a new fuel filter, so if anything it would be the pump or the FPR. Mine is still stock, non-adjustable.
Also, once in a while when I turn over the engine, there's a *thump*, almost like it's backfiring, like if fuel is pooling onto the piston from a stuck injector...not a clank or anything to indicate something is physically broken.
Again, though, what is the stock Fuel pressure supposed to be in a stock 1997 Mustang GT?
Nick
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2008 Mustang GT 'Premium'
Vista Blue Metallic
Interior Upgrade, Comfort Group
Charcoal Leather Interior
Shaker 500 Stereo
Posts: 167 | From: Lafayette, California | Registered: Feb 2003
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Teddy Tiger
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Member # 2473
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posted
I'm hoping that thumping sound is just a loose or broken motor mount. Any other suggestions?
Nick
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2008 Mustang GT 'Premium'
Vista Blue Metallic
Interior Upgrade, Comfort Group
Charcoal Leather Interior
Shaker 500 Stereo
Posts: 167 | From: Lafayette, California | Registered: Feb 2003
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