Backfiring |
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Backfiring |
BfloRandy |
Apr 10 2017, 06:02 PM
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#1
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Dimwit Extraordinaire Group: Members Posts: 66 Joined: 20-September 14 From: Buffalo, NY Member No.: 17,927 Region Association: North East States |
Happy Spring, aka fix your car so you can drive it all summer!
Having an issue tuning my Weber 40's. The car does run, and idles quite well, sounds smooth and even. If I rev beyond 3k, I get backfires. Starts fine too. Ordinarily I would assume it's a simple matter of resetting and resyncing. Passenger side carb is as it always has been, fine. Mix adjustment screws work normally, idle adjustment also. I see the squirt from the accelerator jets. Driver side, not so much. It's getting gas. For some reason, the mix screws have little to no effect. This is on BOTH cylinders. The only time I notice any change in the engine's sound is if I back them way way out, then I get backfiring and carb throat sneezing. Otherwise, I can have them set just about anywhere, including fully seated, and there is no difference. I've pulled the carb off, (three times now) torn it down and blown everything out a couple of times already. I did see some blockage in the idle jets and mains before I blew them out. I also noticed that I didn't see any squirt from the accelerator jets. I tore it down again, and fiddled with the pump (new last spring) and reassembled it. Accel jets now appear to work normally. It doesn't at all help that my kids decided to reorganize a ton of things, and I now can't find my Weber manual. (IMG:style_emoticons/default/chair.gif) Can anyone help? Thanks! |
rhodyguy |
Apr 18 2017, 12:54 PM
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#2
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,093 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
To be clear. The idle speed screws are backed completely out, the arms are against the stops and the idle is at 1.3k?
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BfloRandy |
Apr 18 2017, 12:58 PM
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#3
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Dimwit Extraordinaire Group: Members Posts: 66 Joined: 20-September 14 From: Buffalo, NY Member No.: 17,927 Region Association: North East States |
To be clear. The idle speed screws are backed completely out, the arms are against the stops and the idle is at 1.3k? Yes. A (mal)function of timing? I can easily knock it down to 1k, but then I'm running with retarded timing. I've always had to fight with it to keep the idle down, but never like this! Usually no more than 1200 on a bad day, 1k when I get it just SO. I'm also wondering if there is an issue with my coil or dizzy causing me to not get a good enough spark. |
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