 I think I have a fuel mixture problem, spits and sputters at high RPM's and backfires |
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| malaga_red75 |
 May 10 2007, 11:52 PM
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'74 2.5L N/A Subie  Group: Members Posts: 454 Joined: 5-March 06 From: Menlo Park, CA Member No.: 5,674 Region Association: None  |
So,
I had this problem a while ago, and my mechanic (HPH) said there was too much O2 coming out, so he re-sealed the intake plenum, and it was all good for about a month. Now its been getttin worse and worse as the weeks go on. So....heres what happens. Under *hard* acceleration the car begins to buck/spit/sputter at high rpm's and whenever my foot is not on the gas pedal there is backfire AKA: during shifts and under deceleration in gear. It also *someitmes* happens at a steady speed, but almost everytime under *hard* acceleration. Thanks in advance!!! -Peter It's a 1975 1.8 L Jet |
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| drewvw |
May 11 2007, 10:57 AM
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new england car guy Group: Members Posts: 1,631 Joined: 24-February 06 From: Boston, MA Member No.: 5,630 Region Association: North East States |
sounds like a classic case of a lean condition....you probably have air leaking in again somewhere. How did he reseal it?
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| TravisNeff |
May 11 2007, 04:35 PM
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914 Guru Group: Members Posts: 5,082 Joined: 20-March 03 From: Mesa, AZ Member No.: 447 Region Association: Southwest Region 
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Your plenum could be cracked
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