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Author
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Topic: Misfire at 5000 rpm
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90hogg
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Member # 5313
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posted
 
 
Just got fine tuned. Had a misfire at 4500 rpms. Was told to change Autolight spark plugs 3924's to 3926's (colder). The problem still occurs but now at 5000 rpms. Any help would be appreciated.
Posts: 48 | From: California | Registered: Feb 2005
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svfreerider87
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Member # 5748
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posted
maybe an aftermarket ignitio IE: a crane or msd unit. Perhaps your ignition is running out of juice above 5k? what's your setup?
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Dreamspeed Motorsports
Posts: 1685 | From: Sunnyvale | Registered: Jun 2005
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90hogg
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Member # 5313
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posted
MSD dist, blaster coil, wires. Have Mallory Hyfire 6AL and MSD blaster 2 coil but not installed it was for another stang of mine. I have a MSD 6AL 2 on the way from Summit.
Posts: 48 | From: California | Registered: Feb 2005
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svfreerider87
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Member # 5748
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posted
slap in a stock distributer and install the msd unit. see how that works.
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Dreamspeed Motorsports
Posts: 1685 | From: Sunnyvale | Registered: Jun 2005
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welch93lx
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Member # 8748
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posted
i had the same f@#i thing.i change everything,and it was just the cap. damm i was mad lol
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1991 LX HAtchback
R.I.P LUIS
Posts: 705 | From: modesto | Registered: Nov 2008
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166 Merlo
FELONY
MOTORSPORTS
Member # 1549
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posted
what kind of heads are you running and whats ur combo look like?
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'89 - Boss Coupe
'70 - Drop Cutthang
'68 - Cougnut
'87 - 0166, Its real
Posts: 3954 | From: Thebay | Registered: Jul 2002
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warhorse58gt
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Member # 7702
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posted
what plug gap you running?
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WOLFPACK RACING
With guns, we are 'citizens'. Without them, we are 'subjects'.
83gt 354ci sbf 9.40 @ 143
77 cobra 2 171ci 97hp of pure fury!
Posts: 4200 | From: 209 | Registered: Jun 2007
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DIRTY SALLY
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Member # 7845
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posted
GET RID OF THAT MSD DIS!!!!!!! bro i been having a miss fire in mine for like a month i change the coil spark plugs tfi messed with the air meter cleaned the aic unit nothing worked! so i took out my msd dis and put in the stock one and the the mother fucker run tits now!
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Savage Habits
instagram @2cheezen
Posts: 9145 | Registered: Aug 2007
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92stangLX
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Member # 3252
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posted
quote:
Originally posted by welch93lx:
i had the same f@#i thing.i change everything,and it was just the cap. damm i was mad lol
+1 My rotor was jacked up. When I changed the cap and rotor everything was cool
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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SHORTSHIFTER89
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Member # 7810
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posted
i agree with 87gtcobra i had the same problem with them damm msd dis aint worth the $200 buck. i went with the accell and bamm everthing runs great now i went threy 2msd dis in 1 1/2 years im threw with them. stock or accell is the key. i had the msd dis blaster coil wires waste of money.
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1989 Mustang 5.0 HCI NOW SUPERCHARGED
2013 Range Rover Sport
2011 Bmw 5501 twin turbo 530HP
1998 silverado c1500 cheyenne
Posts: 923 | From: 707 hillside | Registered: Jul 2007
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90hogg
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Member # 5313
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posted
I installed the Mallory Hyfire 6AL, Accel Coil and changed the cap. Problem still exists at 5500 RPMs. I will swap distributors as soon as I get my hands on a stock one. My heads are Twisted Wedges and my plug gap is 54. Thanks for the help thus far!
[ January 14, 2009, 07:01 PM: Message edited by: 90hogg ]
Posts: 48 | From: California | Registered: Feb 2005
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95331StrimVert
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Member # 6250
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posted
close the gap...
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95331StrimVert
Posts: 398 | From: Martinez ca | Registered: Nov 2005
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