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Topic: What would...
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Wildfire532FB
CAFords OG
Member # 1482
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posted
 
 
What would make a 5.0L backfire in the intake, hesitate, jerk at low rpms and make the FP readjust itself? Its got a brand new FPR on it so its not a bad Regulator...
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
ttt
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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Cstang5.0
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Member # 4925
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posted
what about the fuel pump? my frend had the same problem and it was the fuel pump
casey
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88 VERT slow sold
89 coupe stock ; )
02 yukon
05 focus
Posts: 1638 | Registered: Oct 2004
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925five.0
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Member # 3292
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posted
quote:
Originally posted by 68_427_Fastback:
What would make a 5.0L backfire in the intake, hesitate, jerk at low rpms and make the FP readjust itself? Its got a brand new FPR on it so its not a bad Regulator...
mine does the same thing also but only when getting low on fuel. it will pop thru the intake and slow to a crawl and then catch back up. could a small fuel leak cause this?
Posts: 559 | From: -925- | Registered: Sep 2003
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Wildfire532FB
CAFords OG
Member # 1482
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posted
quote:
Originally posted by Cstang50:
what about the fuel pump? my frend had the same problem and it was the fuel pump
casey
I don't think so but i haven't checked it yet.
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
Backfiring in the intake means the car is running rich. What would cause the engine to run rich besides the oxygen sensors?
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
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Posts: 17580 | From: 530 | Registered: Jun 2002
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Blind
2.3L
CAFords OG
Member # 3052
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posted
stuck injectors or leaky injector o-rings, leaky /bad fuel pressure regulator, timing being off.
I had a really bad intake backfire last time I put my engine together and it blew the pvc valve about 30 feet ![[worship]](graemlins/worship.gif) ![[Big Grin]](biggrin.gif) the timing was off.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Wildfire532FB
CAFords OG
Member # 1482
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posted
could i install 19lb injectors without tuning it or changing the MAF?
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
ttt
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./_ _ _ ___ __\
(]]]_ _ o _ _[[[)
|\_o_ __ __o_/|
|__|..........|__|
68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by 68_427_Fastback:
could i install 19lb injectors without tuning it or changing the MAF?
19lb injectors are stock on the HO5.0 engines, so yes.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Wildfire532FB
CAFords OG
Member # 1482
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posted
quote:
Originally posted by blind:
quote:
Originally posted by 68_427_Fastback:
could i install 19lb injectors without tuning it or changing the MAF?
19lb injectors are stock on the HO5.0 engines, so yes.
oh maybe i meant 24s.
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68 Fastback
84 CJ7
94 HMMWV
95 GT
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Posts: 17580 | From: 530 | Registered: Jun 2002
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Sprayin306
New Member
Member # 6022
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posted
Too lean or timing retarded too much causes popping in the intake. I don't know who you got too rich from.
Posts: 2 | Registered: Sep 2005
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HaulinAss Motorsports
Its a STREETRaceCar!
Member # 541
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posted
There are various reasons why it could be backfiring.Timing,Vacum Leak(s),Stretched Timing Chain or the timing chain could have skipped a tooth,Valve adj...I would check the timing and look for any vacum leaks to start off with.If that doesnt cure the problem than look into the other issues.Also you can only use the correct # injectors to what your mass air is calibrated for.
Posts: 22494 | From: Sacramento | Registered: Nov 2001
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Wildfire532FB
CAFords OG
Member # 1482
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posted
It runs perfect right when i start it up and the engine is cold. Then if i drive it for a while and the engine gets warm/hot it'll start hesitating and backfiring in the intake. I can smell gas really badly too when i come to stops.
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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BlownNOSMustang
¯
Member # 158
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posted
Plug wires or burnt spark boots, They will arc to groung when hot. A good start.
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1993 Hatch,363 CI,670 RWHP
Posts: 238 | From: Cow Town,USA. | Registered: Feb 2001
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Wildfire532FB
CAFords OG
Member # 1482
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posted
quote:
Originally posted by BlownNOSMustang:
Plug wires or burnt spark boots, They will arc to groung when hot. A good start.
i do hear a ticking like something is arcing but i've looked at it at night and can't see anything arcing i've had problems with my coil arcing before.
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(]]]_ _ o _ _[[[)
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
i advanced the timing to 13 degrees and it didn't backfire but it was hesitating really bad and i jumped out and opened the hood and the FP was t 20psi at idle ![[Frown]](frown.gif) I think the fuel pump is going bad or something
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./_ _ _ ___ __\
(]]]_ _ o _ _[[[)
|\_o_ __ __o_/|
|__|..........|__|
68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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