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> CIS blown airbox symptom, Was Big Bang thread last week
Kansas 914
post Jul 16 2020, 11:33 AM
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This is a follow up to the BIG BANG thread where the pop off valve was blown to pieces.

I installed a new pop off valve in the existing airbox hoping it would be a quick fix. The car "starts" but doesn't "run". If this was a carbed car I would say it is running on the prime. Maybe the cold start valve is giving it gas to fire then stops? Is this fuel delivery issue (maybe it lead to a lean backfire) or blown airbox?

I am hesitant to pull all the CIS stuff off to get to the airbox as I know I will be in over my head. I have read a few 911 threads on removing the airbox and it is something I have never done. How do you get to the runners under the box (4 -5 6)?


https://www.youtube.com/watch?v=vaA44-K30QA


Engine is a 2.7L from a 1976 911S

Thanks in advance!
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Posts in this topic
Kansas 914   CIS blown airbox symptom   Jul 16 2020, 11:33 AM
Root_Werks   Something else cracked or popped off. When CIS do...   Jul 16 2020, 12:18 PM
Kansas 914   Something else cracked or popped off. When CIS d...   Jul 16 2020, 12:41 PM
914Toy   Make sure the big rubber boot is secure on both en...   Jul 16 2020, 02:35 PM
Kansas 914   Make sure the big rubber boot is secure on both e...   Jul 16 2020, 03:34 PM
Kansas 914   My thoughts right now are to remove the entire CIS...   Jul 16 2020, 05:02 PM
914Toy   [quote name='914Toy' post='2834385' date='Jul 16 ...   Jul 16 2020, 07:10 PM
Superhawk996   I'll chime in but let me be clear that I don...   Jul 17 2020, 06:42 AM
Kansas 914   I'll chime in but let me be clear that I don...   Jul 17 2020, 06:54 AM
Superhawk996   I'll chime in but let me be clear that I don...   Jul 17 2020, 07:09 AM
Kansas 914   Can totally appreciate that. In either case - y...   Jul 19 2020, 11:24 AM
sixnotfour   make sure off fuel delivery 1st..with air cleaner ...   Jul 19 2020, 12:00 PM
Kansas 914   make sure off fuel delivery 1st..with air cleaner...   Jul 19 2020, 12:51 PM
Kansas 914   [quote name='sixnotfour' post='283517...   Jul 19 2020, 01:43 PM
porschetub   make sure off fuel delivery 1st..with air cleane...   Jul 19 2020, 02:35 PM
Kansas 914   Yes that will do it as I mentioned,I researched ...   Jul 19 2020, 03:05 PM
Jim2   Hi I'm from pelican. I had asked you about th...   Jul 19 2020, 03:43 PM
Kansas 914   Hi I'm from pelican. I had asked you about t...   Jul 19 2020, 04:58 PM
Kansas 914   CIS system is out of the car. It took me a bit lo...   Jul 19 2020, 05:11 PM
ClayPerrine   Mike, I would suggest that you get a replacement ...   Jul 19 2020, 02:12 PM
Kansas 914   Mike, I would suggest that you get a replacement...   Jul 19 2020, 02:59 PM


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