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996 c4 Starting Issue
I've researched this issue for some time, thought I'd post for some direct input. My stock 996 runs well, but when I run it to optimal temperature, like a quick errand, and park it somewhere for a few minutes, then try and start it .... it cranks for 10 seconds or longer (sometimes needs 4-5 attempts) before it stumbles to fire up. When it does start, it seems the engine is stumbling a bit at first, on occasion will die and I repeat the process. There is also a strong fuel smell during this cranking process.
The cranking itself is energetic, the battery is new. I have no other starting issues, just hot starts. I did get a CEL code: P0448;"Evaporative Emission Control System Vent Valve/Solenoid Circuit Shorted" per P0448 Evaporative Emission Control System Vent Valve/Solenoid Circuit Shorted, so yesterday I replaced the Fuel Tank Vent Valve on Filler Neck (Bleeder Valve), and the code has not resurfaced. I have test run the car a couple of times since valve replacement, and am now able to say that the situation has improved somewhat. Now it will hot crank about 4-5 seconds (maybe 2 attempts) and will fire. Still not like it used to do, (or as it will cold, now) one turn of the key, 1-2 seconds of cranking and it fires. Things I am considering trying now at this point are (in order): - Fuel pump relay, some have reported success, cheap solution ($15) - CPS, seems like a highly talked about solution for my issue with a moderate rate of success. - Fuel Pump, many reported similar problems that this fixed, but ouch$$$! - Coolant temp sensor, I read one or two folks had my issue and this fixed it. So my question now is.... Is my list in the right order and is there something I've missed here? Any/All suggestions are greatly appreciated!!! Thanks! Update 3/24/14 After an hour long "test" run, I shut off the car for 45 minutes or so, came back and it took 20+ seconds of cranking until it stumbled up and fired. Ran great after a couple revs. So problem still there. Last edited by CaptJack; 03-24-2014 at 01:52 PM.. |
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03-23-2014, 06:20 AM
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Registered
Join Date: Jan 2008
Location: NJ
Posts: 1,186
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Replace the other vent valve in the engine compartment. I think it is called Purge or regeneration valve?
http://forums.rennlist.com/rennforums/996-forum/773261-humming-noise-near-gas-cap.html
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2013 991.1 Carrera S Cab 2004 996 Turbo CAB X50 sold 2003 996 cab 6 speed Sold 1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold DE instructor since 1985 |
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03-24-2014, 12:12 PM
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Registered User
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I found the Purge/Regeneration valve as part number 996-110-129-53-M100. Above the alternator, I believe. Sound correct?
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03-24-2014, 01:53 PM
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Registered
Join Date: Jan 2008
Location: NJ
Posts: 1,186
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yes
__________________
2013 991.1 Carrera S Cab 2004 996 Turbo CAB X50 sold 2003 996 cab 6 speed Sold 1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold DE instructor since 1985 |
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03-24-2014, 04:47 PM
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Andrea Bichael
Join Date: Feb 2014
Location: Ann Arbor, MI, USA
Posts: 39
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I think problems in your engine valve and that's making problems. You are facing problems while starting your car. You have to repair your engine very soon. It will help you to get your performing much better than before.
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03-26-2014, 02:54 AM
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Update 4-16-14
After receiving the replacement valve part referenced above, I am pleased to say this problem has been corrected. The cel code p0446 has not reappeared, after 200+ miles of driving and have restarted the hot car 6+ times with no issue. Thanks to all that provided direction and the ultimate solution. Probably saved me hundreds of dealer/indy diagnostic dollars by putting this $94 part in, which only took five minutes!
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04-17-2014, 11:25 AM
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1999 996 C4
