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Author
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Topic: Backfire in intake on foxbody mustang
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SikWiditMke
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Member # 9699
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posted
 
 
When I'm driving my car, it will backfire out the intake manifold in my 1st gear pull, and it feels like it's being choked up.
What can be my problem.
5-speed
E303
Cobra upper and lower ported
70mm TB
24lb injectors set at 40 PSI with vaccum off
Ported E7 heads with trickflow valve springs
Timing is set at 12*
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90 GT *sold*
92 GT *sold*
90 Notchback *wrecked and sold*
93 Ex-CHP notchback *Daily driver*
Posts: 558 | From: El Sobrante/Vallejo | Registered: Jan 2010
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turbo50
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Member # 6700
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posted
Clean maf, check connections etc
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.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
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SikWiditMke
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Member # 9699
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posted
I already did the base idle reset and TPS is set at .98
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90 GT *sold*
92 GT *sold*
90 Notchback *wrecked and sold*
93 Ex-CHP notchback *Daily driver*
Posts: 558 | From: El Sobrante/Vallejo | Registered: Jan 2010
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SikWiditMke
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Member # 9699
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posted
quote:
Originally posted by turbo50:
Clean maf, check connections etc
Ill get some MAF cleaner today, and see if that will help me.
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90 GT *sold*
92 GT *sold*
90 Notchback *wrecked and sold*
93 Ex-CHP notchback *Daily driver*
Posts: 558 | From: El Sobrante/Vallejo | Registered: Jan 2010
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iSTUNT707
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Member # 11430
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posted
sounds like your timings off
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"toooouchdown RAIDERS!".....greg papa
Posts: 170 | From: fairfield/vallejo/cordelia | Registered: Nov 2011
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SikWiditMke
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Member # 9699
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posted
quote:
Originally posted by iSTUNT707:
sounds like your timings off
I double checked my timing, it's set at 12* and re stabbed my dizzy twice.
I'm thinking my MAF or a suspected bad IAC "car no longer fast idle"
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90 GT *sold*
92 GT *sold*
90 Notchback *wrecked and sold*
93 Ex-CHP notchback *Daily driver*
Posts: 558 | From: El Sobrante/Vallejo | Registered: Jan 2010
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iSTUNT707
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Member # 11430
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posted
if its in the intake isn't that predetinanion of fuel? could be a camshaft issue to had that issue with my chevelle when the cam was wiped
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"toooouchdown RAIDERS!".....greg papa
Posts: 170 | From: fairfield/vallejo/cordelia | Registered: Nov 2011
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NK2186
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Member # 12319
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posted
I am also running an E303 cam and had to bump my timing up to 14* and then 16* to get the fuel to burn properly. Is your balancer in good condition? it could be off if it is not. When I first started my engine after the build I ran 12* timing and the fuel was burning my eyes because it wasn't enough initial timing.
I have stock fuel system though with E7 heads unported + aftermarket springs.
How do your o2 sensors look? have you checked the plugs to see if they are wet?
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90 LX 5.0 - Stolen/stripped
89 LX 5.0 - Stolen and missing as of 7-24-13. LIC# 4HIP151 :(
99 Cobra
00 Exploder
Posts: 400 | From: Haystack | Registered: Aug 2012
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JohnB
Tech Moderator
Member # 969
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posted
+1 on the balancer ring slipping.
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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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iSTUNT707
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Member # 11430
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posted
my balancer walked on my mustang the marker was at 30 degrees but motor was at tdc pretty nuts those things are crap get an aftermarket one
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"toooouchdown RAIDERS!".....greg papa
Posts: 170 | From: fairfield/vallejo/cordelia | Registered: Nov 2011
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SikWiditMke
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Member # 9699
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posted
I replaced my IAC and clean my MAF, the problem is now gone! I'm suspecting my MAF, since it was super filthy!
Thanks for all the help
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90 GT *sold*
92 GT *sold*
90 Notchback *wrecked and sold*
93 Ex-CHP notchback *Daily driver*
Posts: 558 | From: El Sobrante/Vallejo | Registered: Jan 2010
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