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07-02-2013, 06:59 AM
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CC Member
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Join Date: Sep 2012
Location: Portland,
Ny
Cobra Make, Engine: Factory 5, 390FE
Posts: 11
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Not Ranked
Herman1
I have a Cobra with an 390 FE, just replaced the intake and carb, along with plug wires, when timing, I have a smal back fire at 3000 RPM. set at 6 deg, anyone have any suggestions. Or should i be looking for something else? Thanks
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07-02-2013, 07:44 AM
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Senior Club Cobra Member
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Join Date: May 2007
Location: Mesa,
AZ
Cobra Make, Engine: Contemporary Classic, 428 FE CCX 3069
Posts: 7,506
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Not Ranked
Move it out to a out 10 to 12 to start and try again. What kind of ignition set up do you have?
__________________
Dan in Arizona
CCX3209
"It's a great car and I love it, but it doesn't do 'SLOW' very well."
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07-02-2013, 09:58 AM
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CC Member
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Join Date: Sep 2012
Location: Portland,
Ny
Cobra Make, Engine: Factory 5, 390FE
Posts: 11
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Not Ranked
Herman1
Mallory
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07-02-2013, 11:00 AM
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CC Member
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Join Date: Oct 2003
Location: Queen Creek,
AZ
Cobra Make, Engine: Midstates, Vette suspension, Baer 6P brakes, 540 cid Chevy, Haltech Fuel Injection
Posts: 906
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Not Ranked
At 3000 rpm you should be set at somewhere between 30 and 38 degrees advanced. This must not include any vacuum advance. Disconnect the vaccuum advance and plug the vacuum line before checking your timing.
__________________
E. Wood
ItBites
10.69 @ 129.83mph - on pump gas and street tires
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07-02-2013, 11:56 AM
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CC Member
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Join Date: Sep 2012
Location: Portland,
Ny
Cobra Make, Engine: Factory 5, 390FE
Posts: 11
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Not Ranked
Thanks, I'll try that
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07-02-2013, 05:12 PM
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CC Member
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Join Date: Mar 2012
Location: Ocala,
FL
Cobra Make, Engine: Unique 427 S/C, FE 440, top-loader, 3.31
Posts: 130
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Not Ranked
Mallory's are factory set at 24 degrees of total advance. Set timing at 36 all in at give or take 3000 rpm. 36 minus 24 equal 12 at start up. You should be good.
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07-02-2013, 05:15 PM
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CC Member
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Join Date: Sep 2012
Location: Portland,
Ny
Cobra Make, Engine: Factory 5, 390FE
Posts: 11
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Not Ranked
Found a problem
Got it timed and still had slight back fires, took out the plugs and found the driver side has been running lean, I the looked into the carb, found one side spraying fuel good and one side poorly, it's a new carb. Anyone have any ideas or shall I contact summit where I bought the new carb?
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07-03-2013, 03:48 AM
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CC Member
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Join Date: Mar 2012
Location: Ocala,
FL
Cobra Make, Engine: Unique 427 S/C, FE 440, top-loader, 3.31
Posts: 130
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Not Ranked
I would pull the float bowl and check that the primary jets are clear. Probably a small bit of metal stuck on jet left from manufacturing
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07-03-2013, 11:52 AM
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CC Member
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Join Date: Sep 2012
Location: Portland,
Ny
Cobra Make, Engine: Factory 5, 390FE
Posts: 11
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Not Ranked
Will let you know tonight
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07-03-2013, 02:14 PM
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CC Member
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Join Date: Mar 2012
Location: Ocala,
FL
Cobra Make, Engine: Unique 427 S/C, FE 440, top-loader, 3.31
Posts: 130
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Not Ranked
Make double sure firing order is correct and that 7 and 8 plug wires are not running parallel or you can get cross fire between them. Firing order 15426378 and rotor spins counter clock wise.
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07-15-2013, 10:27 AM
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CC Member
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Join Date: Sep 2012
Location: Portland,
Ny
Cobra Make, Engine: Factory 5, 390FE
Posts: 11
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Not Ranked
Found a lifter froze up, found the cam also damaged, replaced both and all is fine.
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07-15-2013, 03:12 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Not Ranked
your scaring me herman........you wiped a cam and a lifter, and just replaced them?
what about all of the debris from the damage, where do you think it all went?.....
your fix may only be short lived......
__________________
Fred B
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07-18-2013, 07:00 AM
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CC Member
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Join Date: Jun 2002
Location: Canton,
GA.
Cobra Make, Engine: E.R.A. #505
Posts: 216
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Not Ranked
Are you sure the lifter bore is not worn out?
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