2007 Suburban Backfire through Intake Manifold 'Pop"
November 9th, 2018, 1:51 PM
#1
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2007 Suburban Backfire through Intake Manifold 'Pop"
HI All, I'm a bit stumped. I've got a 2007 Subururban LTZ with 5.3 flex fuel, 196K miles. No error codes at present. Occasionally it'll through a P0442 Evap small leak detected. When started cold it will, what I think anyway, is a small backfire through the intake manifold. Just makes a quick pop, misses a second, keeps running. Will do it several times. Once warmed up, it runs perfect. Not misses, no engine light in dash, nothing. I'm wondering if it is something in metering... MAF or O2 Sensors. It's had a new fuel pump in the last few months but same symptoms before and after pump. Issue went away over the summer when it was warm here in KS. Colder it is the worse the problem. Any similar experiences or ideas to fix? Thanks all!
November 11th, 2018, 4:19 AM
#4
CF Monarch
HI All, I'm a bit stumped. I've got a 2007 Subururban LTZ with 5.3 flex fuel, 196K miles. No error codes at present. Occasionally it'll through a P0442 Evap small leak detected. When started cold it will, what I think anyway, is a small backfire through the intake manifold. Just makes a quick pop, misses a second, keeps running. Will do it several times. Once warmed up, it runs perfect. Not misses, no engine light in dash, nothing. I'm wondering if it is something in metering... MAF or O2 Sensors. It's had a new fuel pump in the last few months but same symptoms before and after pump. Issue went away over the summer when it was warm here in KS. Colder it is the worse the problem. Any similar experiences or ideas to fix? Thanks all!
Not really all that familiar with F/F, but does it do this on gasoline only or on E85 ?