 Carb hot start questions |
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| mb911 |
 Jun 30 2022, 07:04 AM
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#1
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914 Guru  Group: Members Posts: 6,855 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest 
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My car runs really well. Cold starts great. Has phenolic spacers etc but after I shut it off I have to have the throttles open at least half way and crank for 5-10 seconds to start. If I don't open the throttles then it will sound like timing is to advanced but clearly is not and it will stumble until it clears out.It has to be some excessive fuel getting down the throats somehow? What to check? Floats sticking?
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| brant |
Jun 30 2022, 07:20 AM
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#2
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914 Wizard Group: Members Posts: 11,626 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Most likely fuel is still over-boiling. Despite the phenolic spacers
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| mb911 |
Jun 30 2022, 07:32 AM
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#3
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914 Guru Group: Members Posts: 6,855 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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QUOTE(brant @ Jun 30 2022, 05:20 AM)  Most likely fuel is still over-boiling. Despite the phenolic spacers That is strange still did it this morning on my run over to cover the boat. Never even got to 180 degrees on the drive there and it was only about 72 this morning. So what are my options? |
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| 914Toy |
Jun 30 2022, 08:35 AM
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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
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QUOTE(mb911 @ Jun 30 2022, 06:32 AM) QUOTE(brant @ Jun 30 2022, 05:20 AM) Most likely fuel is still over-boiling. Despite the phenolic spacers That is strange still did it this morning on my run over to cover the boat. Never even got to 180 degrees on the drive there and it was only about 72 this morning. So what are my options? 1) Start by turning the ignition on and wait about 20 seconds (time for the fuel pump to fill the float bowels), 2) press the accelerator pedal slowly to the floor (accelerator pumps squirt fuel down the intake) then release it, 3) engage the starter motor, 4) then press the accelerator (1/3rd) after the motor is turning over. Works for me! |
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| mb911 |
Jun 30 2022, 08:48 AM
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#5
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914 Guru Group: Members Posts: 6,855 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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QUOTE(914Toy @ Jun 30 2022, 06:35 AM) QUOTE(mb911 @ Jun 30 2022, 06:32 AM) QUOTE(brant @ Jun 30 2022, 05:20 AM) Most likely fuel is still over-boiling. Despite the phenolic spacers That is strange still did it this morning on my run over to cover the boat. Never even got to 180 degrees on the drive there and it was only about 72 this morning. So what are my options? 1) Start by turning the ignition on and wait about 20 seconds (time for the fuel pump to fill the float bowels), 2) press the accelerator pedal slowly to the floor (accelerator pumps squirt fuel down the intake) then release it, 3) engage the starter motor, 4) then press the accelerator (1/3rd) after the motor is turning over. Works for me! For hot engine? I have zero issues cold. The engine is clearly flooding in a hot start situation. I believe it's perculation or a float sticking, needle and seat. But with the carbs being 1000k fresh for performance oriented I need to zero in on which one I should concentrate on. |
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Posts in this topic
mb911 Carb hot start questions Jun 30 2022, 07:04 AM
sixnotfour http://forums.pelicanparts.com/porsche-911...tml#p... Jun 30 2022, 08:48 AM
mb911
http://forums.pelicanparts.com/porsche-911...tml#... Jun 30 2022, 09:20 AM sportlicherFahrer Floats and fuel pressure are always good to verify... Jun 30 2022, 08:53 AM mb911
Floats and fuel pressure are always good to verif... Jun 30 2022, 09:18 AM slivel Is your hot start problem new or has it existed fo... Jun 30 2022, 10:19 AM Mark Henry I would also say float level and fuel pressure. I ... Jun 30 2022, 10:53 AM rhodyguy After a prolonged drive open the engine lid when y... Jun 30 2022, 12:43 PM mb911 So nothing has changed this is sort of new as far ... Jun 30 2022, 02:14 PM |
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