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Rennch on YouTube
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My 3.6 is NOT happy. Lulling and bobbing.
Hi, it appears as if I have a vacuum leak or some other situation. I'm wondering if something has become unplugged, but nothing is apparent. I don't have a smoker so it's tough to check for leaks. Any thoughts?
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Michael O'Neal - 69 RSR Clone(ish) - The build: http://bit.ly/69porschersr 69 911S Blasphemy Build on YouTube Rennch Youtube Channel: http://rennch.com/Youtube Instagram: https://www.instagram.com/_rennch_/ |
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01-29-2017, 10:07 AM
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RETIRED
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Failed 02 sensor?
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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01-29-2017, 10:18 AM
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Registered
Join Date: Feb 2006
Location: los angeles
Posts: 312
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need to reset idle stabilization....
look at steve wong's 911chips website for details.. good luck.. |
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01-29-2017, 10:46 AM
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Rennch on YouTube
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I'll have a look thanks!
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Michael O'Neal - 69 RSR Clone(ish) - The build: http://bit.ly/69porschersr 69 911S Blasphemy Build on YouTube Rennch Youtube Channel: http://rennch.com/Youtube Instagram: https://www.instagram.com/_rennch_/ |
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01-29-2017, 08:20 PM
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Registered
Join Date: Oct 2005
Location: Idaho
Posts: 2,356
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Michael,
If you figure something out, please post your findings. I have been chasing a similar issue w/my 3.6L'd car since pretty much forever - a wandering/surging idle. I removed the intake last winter and made a smoke machine to track down leaks and was not able to find any. I've cleaned the ICV numerous times and that has not helped either. I've tested various sensors, wiring and connectors and not found anything amiss... I have unplugged the battery to reset the idle stabilization per Steve Wong's instructions, but the issue continues to persist. It's frustrating to say the least. I have NOT thrown new parts at it yet as everything I've tested seems to check out A-OK... I'd love to know if a simple reset of the idle stabilization works for you or if you find something else... Tom Here's a link to a video I did last summer I think. Make sure to turn on CC as I added some notes to the video... https://youtu.be/YyMOkhpGL54
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'74 911 Red Sunroof Coupe, 3.6L, etc... '76 912 Yellow SPEC 911/911CUP Last edited by Tom '74 911; 01-30-2017 at 07:28 AM.. |
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01-30-2017, 07:18 AM
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Registered
Join Date: Oct 2005
Location: Idaho
Posts: 2,356
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Also, one other thing to note from the video (which seems to have embedded correctly!) is at the 30 second mark when I press the accelerator to increase the RPM, the engine RPM stutters slightly before increasing. This is another weird trait that I'd like to correct. I keep coming back to the idle micro switch on the throttle body, but as far as I can tell, it is operating correctly...
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'74 911 Red Sunroof Coupe, 3.6L, etc... '76 912 Yellow SPEC 911/911CUP |
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01-30-2017, 07:28 AM
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Mine does the same thing sometimes when cold. SW chip - idle set numerous times. I know I have a slight leak though so not too worried about it until I fix that.
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1986 Carrera Coupe - 1987 W124 300E - 1999 Land Cruiser 100 - 2021 GLA250 |
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01-30-2017, 07:41 AM
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This looks to be a '95 non-OBDII 993. And it most likely isn't as simple as resetting the idle. You can try to disconnect the battery wait a minute and re-connect. That wipes out idle adaptation on the DME. If it still does hunt after that something else is going on.
By the way, a 993 doesn't have micro-switches for idle and full-throttle like earlier DME version. It uses a continuous throttle position sensor instead. If that is broken this could explain the issue. Did this happen all of a sudden? Can you read (scanner) or flash out (CEL) fault codes from the DME? If you have access to a Porsche scanner (Hammer, PST-2) you can check function of the ICV, TVS, O2 sensor, etc. Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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01-30-2017, 01:00 PM
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Rennch on YouTube
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Yes, it reminds me of when I drove without the oil cap on a few months ago.
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Michael O'Neal - 69 RSR Clone(ish) - The build: http://bit.ly/69porschersr 69 911S Blasphemy Build on YouTube Rennch Youtube Channel: http://rennch.com/Youtube Instagram: https://www.instagram.com/_rennch_/ |
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01-31-2017, 01:36 PM
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have you tried unplugging the maf sensor? when you do what happens?
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01-31-2017, 01:40 PM
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Rennch on YouTube
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Quote:
Where does that live? Sent from my iPhone using Tapatalk
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Michael O'Neal - 69 RSR Clone(ish) - The build: http://bit.ly/69porschersr 69 911S Blasphemy Build on YouTube Rennch Youtube Channel: http://rennch.com/Youtube Instagram: https://www.instagram.com/_rennch_/ |
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01-31-2017, 05:59 PM
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Administrator
Join Date: Feb 2000
Location: Los Angeles
Posts: 13,333
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 Up above the arrow. It's too big to include but this link shows the four pins visible once the sensor wire is removed. Turn engine off. Untwist to remove the wire. Restart and see if there's a difference.
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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01-31-2017, 06:34 PM
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Rennch on YouTube
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Roger that. Thanks Jack.
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Michael O'Neal - 69 RSR Clone(ish) - The build: http://bit.ly/69porschersr 69 911S Blasphemy Build on YouTube Rennch Youtube Channel: http://rennch.com/Youtube Instagram: https://www.instagram.com/_rennch_/ |
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01-31-2017, 06:52 PM
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My experience with 964 engines is that the idle is horrible with a light flywheel and original/improper chip.
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Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. |
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02-01-2017, 01:16 PM
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Rennch on YouTube
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Quote:
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Michael O'Neal - 69 RSR Clone(ish) - The build: http://bit.ly/69porschersr 69 911S Blasphemy Build on YouTube Rennch Youtube Channel: http://rennch.com/Youtube Instagram: https://www.instagram.com/_rennch_/ |
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02-01-2017, 03:36 PM
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Rennch on YouTube
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My buddy Bryant and I dug around a lot, took off the air intake a few times, and tightened every hose clamp and plug we could find. Removing the plug from the MAF seemed to work, but we had a pesky whistling sound vacuum leak. After messing with it for 30 minutes, we put it back together for the third time and did not hear any more whistle. Now it seems to be running very well! Thank you all for your help!
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Michael O'Neal - 69 RSR Clone(ish) - The build: http://bit.ly/69porschersr 69 911S Blasphemy Build on YouTube Rennch Youtube Channel: http://rennch.com/Youtube Instagram: https://www.instagram.com/_rennch_/ |
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02-04-2017, 04:53 PM
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Da cab
Carrera
1974 Porsche 911 Targa 3.6
1977 Porsche 911 Targa 2.7s
