 what does this sound like to you, tuning help needed |
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| G e o r g e |
 Jul 1 2008, 12:16 AM
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#1
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Dr  Group: Members Posts: 1,905 Joined: 20-September 05 From: Southern Cal Member No.: 4,832 Region Association: None 
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Setting my engine timing at 28 degrees at 3500 rpms I get backfiring/ popping
can this be caused by fuel starvation? or is this because of another issue i'm using the mark on the fly wheel to set timing any tips on trouble shooting? |
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| PeeGreen 914 |
Jul 1 2008, 12:19 AM
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#2
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Just when you think you're done...wait, there is more..lol Group: Members Posts: 10,219 Joined: 21-September 06 From: Seattle, WA... actually Everett Member No.: 6,884 Region Association: Pacific Northwest
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Well, I'm kinda going through the same thing right now. Yes, when it pops it is lean, as I understand it,. I really can't help you out much more as I am out of my league when it comes to carbs. I'm just learning.
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| G e o r g e |
Jul 1 2008, 12:45 AM
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#3
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Dr Group: Members Posts: 1,905 Joined: 20-September 05 From: Southern Cal Member No.: 4,832 Region Association: None
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not carbs
but i can increase fuel values |
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| PeeGreen 914 |
Jul 1 2008, 01:16 AM
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#4
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Just when you think you're done...wait, there is more..lol Group: Members Posts: 10,219 Joined: 21-September 06 From: Seattle, WA... actually Everett Member No.: 6,884 Region Association: Pacific Northwest
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fuel injection? Hmmm... I don't really know why that would be happening with fuel injection unless there was an exhaust leak.
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| jmill |
Jul 1 2008, 01:20 AM
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#5
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
Is it popping out of the intake or exhaust? Lean pops are out of the intake.
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| Dr. Roger |
Jul 1 2008, 02:36 AM
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#6
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A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
is your ignition system healthy?
custom setup? |
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| Jake Raby |
Jul 1 2008, 06:40 AM
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#7
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Always verify mechanical integrity first.. This means a leak down and compression test are done first.
If the engine checks out with no mechanical issues then I'd say you more than likely have a funky injector and that causing a single cylinder to lean out. if it does this on acceleration, try both low and high speed ACCEL enrichment and see if it gets better. |
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