Screaming engine |
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Screaming engine |
TonyA |
Sep 25 2021, 09:16 AM
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#1
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Nachmal Group: Members Posts: 470 Joined: 17-November 16 From: Hilltown PA Member No.: 20,596 Region Association: North East States |
Here are the symptoms. 2.0 engine running duel Webber’s no chokes. Tried to go to C&C this morning a really cold 45 would not start so I sprayed a little starting fluid into carbs it fired a little because I really want my coffee. Sprayed a little more it fired up and screamed to 5-6K Rpm. Had to turn the key off. Let is sit a little while fired it up again and again screaming to 5-6K. Throttles not stuck. Started again and it idled nicely. Without touching the gas pedal it screams again to 6K. My only thoughts are the new fuel pump that I installed back in July which ran great all summer may be the cause. Any other suggestions. Help I need to get my coffee.
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TonyA |
Sep 25 2021, 12:43 PM
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#2
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Nachmal Group: Members Posts: 470 Joined: 17-November 16 From: Hilltown PA Member No.: 20,596 Region Association: North East States |
Thanks guys. Gaskets all look good from the outside I did not disassemble yet. Everything was fine when I parked it two weeks ago. So if there is a vacuum leak somewhere it is still getting way to much fuel and it would still be a faulty pump correct? It did idle at one point and then ran wild so how could that happen if there was a vacuum leak that suddenly closed up. The pump sounds like it does not stop like the fuel injector type. Is this normal on the carb fuel pumps? Not sure where I purchased it.
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Superhawk996 |
Sep 25 2021, 02:12 PM
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#3
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914 Guru Group: Members Posts: 5,842 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
Thanks guys. Gaskets all look good from the outside I did not disassemble yet. Everything was fine when I parked it two weeks ago. So if there is a vacuum leak somewhere it is still getting way to much fuel and it would still be a faulty pump correct? It did idle at one point and then ran wild so how could that happen if there was a vacuum leak that suddenly closed up. The pump sounds like it does not stop like the fuel injector type. Is this normal on the carb fuel pumps? Not sure where I purchased it. None of it really makes sense. Gotta start somewhere. Too many unknowns. Too much fuel without air will simply cause flooding or a super rich mixture. I don't like guessing at things. I'd just put a fuel pressure gauge on it -- 3 psi is normal for carbs. After that you're left with the basics like disconnecting the throttle cable and linkages to make sure something isn't binding and that throttle plates are really closed at idle. I'd then pull mains & idle jets to make sure something isn't plugged and causing a lean condition (though this is higly unlikely that you'd be running at 5K RPM's lean with throttle closed). After that you're pulling the carbs and checking gaskets. After that you're cleaning and rebuilding the carbs, resetting air bypass and mixture screws, resynching the carbs, and finally readjusting linkages, and might as well retime it too. PS -- when you say no chokes -- are they disabled? Are the choke plates removed AND the enrichment pistons disabled? |
914Toy |
Sep 25 2021, 04:23 PM
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#4
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Senior Member Group: Members Posts: 718 Joined: 12-November 17 From: Laguna beach Member No.: 21,596 Region Association: Southern California |
Thanks guys. Gaskets all look good from the outside I did not disassemble yet. Everything was fine when I parked it two weeks ago. So if there is a vacuum leak somewhere it is still getting way to much fuel and it would still be a faulty pump correct? It did idle at one point and then ran wild so how could that happen if there was a vacuum leak that suddenly closed up. The pump sounds like it does not stop like the fuel injector type. Is this normal on the carb fuel pumps? Not sure where I purchased it. None of it really makes sense. Gotta start somewhere. Too many unknowns. Too much fuel without air will simply cause flooding or a super rich mixture. I don't like guessing at things. I'd just put a fuel pressure gauge on it -- 3 psi is normal for carbs. After that you're left with the basics like disconnecting the throttle cable and linkages to make sure something isn't binding and that throttle plates are really closed at idle. I'd then pull mains & idle jets to make sure something isn't plugged and causing a lean condition (though this is higly unlikely that you'd be running at 5K RPM's lean with throttle closed). After that you're pulling the carbs and checking gaskets. After that you're cleaning and rebuilding the carbs, resetting air bypass and mixture screws, resynching the carbs, and finally readjusting linkages, and might as well retime it too. PS -- when you say no chokes -- are they disabled? Are the choke plates removed AND the enrichment pistons disabled? Follow Superhawk's guide which is the logical trouble shooting/fix. |
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