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Author
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Topic: Back fire from exhaust when Decelerating
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 11-16-2006 04:22 PM
 
I have a friend who just built a A/C cobra kit car. With a 408w,holley 750 dp,afr heads,comp roller cam don't know which one? msd ignition. Almost ever time he decelerates he gets a back fire from the exhaust?
Any idea's on what it might be??------------------
oddly obsessed with big scoops on little Mustangs HOOD HACKERS DELIGHT!
My Pics 13.563 @ 108.64 [This message has been edited by Fastymz (edited 11-16-2006).]
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scottford351
Gearhead Posts: 151
From: reedsville ohio usa
Registered: May 2003
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posted 11-16-2006 05:00 PM
A header leak can cause it
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SkinnyMan
Gearhead Posts: 916
From: Tupelo, MS - USA (CA temporarily)
Registered: Jan 2005
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posted 11-16-2006 05:07 PM
quote:
Originally posted by Fastymz:
Any idea's on what it might be??
May be it's running too rich. ------------------
SkinnyMan
Tupelo, MS Thank you, Thank you very much!
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MidLifCrisis
Gearhead Posts: 673
From: Frederick County, MD
Registered: Oct 2001
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posted 11-16-2006 07:08 PM
Ron, if you put free flowing pipes on a motorcycle without rejetting the same will occur due to a lean condition. I would check the plugs to see what they look like. Charlie
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 11-16-2006 07:12 PM
He has been jetting it down thinking it was an over rich condition. Thanks for the advice guys. 
It's always nice to act like I know what I'm talking about.  ------------------
oddly obsessed with big scoops on little Mustangs HOOD HACKERS DELIGHT!
My Pics 13.563 @ 108.64
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 11-17-2006 04:37 PM
I talked with Jim today about his cobra back firing. He said he's both moved the jets richer and leaner, still the same back fire?------------------
oddly obsessed with big scoops on little Mustangs HOOD HACKERS DELIGHT!
My Pics 13.563 @ 108.64
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BlueMule
Gearhead Posts: 1781
From: Kent Island, MD USA M&M # 2423
Registered: Sep 2002
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posted 11-17-2006 06:41 PM
Loose header was said before. Did he torque them bolts back down after checking for a blown out gasket? Been there. Drove me crazy...------------------
-Paul 70 Mach1 351C/FMX
79 Ranchero GT smogger 302/C4
97 Expedition XLT 5.4
05 F150 Lariat SuperCab 5.4 4x4 'If you're not the lead dog, the view never changes.'
'It's only half past 12, but I don't care... It's 5 o'clock somewhere.'
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