View Full Version : Back firing into intake???
foglejs
01-05-2011, 04:13 PM
I have a 92 mustang coupe with a fresh 306ci and it bask fires into the intake when its cold? Any suggestions?
TheYellaBrick
01-05-2011, 06:27 PM
What type of fuel/air management system ?
( Carb or FI )
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foglejs
01-06-2011, 02:52 AM
FI
TopspeedLowet
01-06-2011, 03:25 AM
Lean mixtures burn longer than rich mixtures. You are likely very lean no matter which type of fuel system you have. What is causing this problem? Several things could cause this but the problem is likely a lean condition. Lean mixtures can still be burning from the previous power stroke and flash off the incoming intake charge when the intake valve first opens to fill the cylinder on the following intake stroke. Rich mixtures run out of oxygen and finish burning in the exhaust often in the form of a backfire when oxygen gets to the unburned fuel. A bad regulator or a too small injector or partially plugged injector, low fuel pressure, etc, etc.
Bruce
Leoatcobrapower
03-14-2011, 11:59 AM
My instincts says timing.....
I don't know ...
MOHO