|
|
|
|
| Author |
|
|
Registered
Join Date: Sep 2005
Location: Clifton, VA
Posts: 153
|
Spark plugs after a complete rebuild
Evening all...
After a complete rebuild and new P/C with rings...I was doing my 500 mile break-in service and I was looking at my plugs and noticed that 6, 5, & 4 had a fair amount of carbon build up versus 1, 2, 3 which were fine. My car ran a bit rich until I could tune the Air fuel which it did take multiple times with varying weather temps and finding out I had a bad fuel relay. I cleaned them up and I should have taken a photo. I am using Bosch W4CS and set at .07m Why one side
__________________
Scott 1979 930 - Black on Black and in the woods "My third child that will cost more in the long run" :shock: |
||
12-04-2015, 03:25 PM
|
|
|
Straight shooter
|
Carbs out of balance? Check adjustment to make sure the butterflies open simultaneously.
__________________
“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.” ― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values |
||
|
12-04-2015, 09:00 PM
|
|
|
Registered
Join Date: Sep 2005
Location: Clifton, VA
Posts: 153
|
Quote:
No Carbs... Anyone??
__________________
Scott 1979 930 - Black on Black and in the woods "My third child that will cost more in the long run" :shock: |
||
|
12-05-2015, 04:53 AM
|
|
|
Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,132
|
Quote:
|
||
|
12-05-2015, 06:12 AM
|
|
|
Registered
Join Date: Sep 2005
Location: Clifton, VA
Posts: 153
|
My apologies
1979 930 - engine 83 ROW/Canada based on the stamp on the case, type 930/66 CIS fuel injection Only Mod was 930 sport grind on the cams by Elgin Cams
__________________
Scott 1979 930 - Black on Black and in the woods "My third child that will cost more in the long run" :shock: |
||
|
12-05-2015, 06:51 AM
|
|
|
Registered User
|
plug wires?
|
||
|
12-05-2015, 09:40 AM
|
|
|
Registered
Join Date: Sep 2005
Location: Clifton, VA
Posts: 153
|
The car drives well.. I might consider new wires. They were one of the few things I did not replace...
__________________
Scott 1979 930 - Black on Black and in the woods "My third child that will cost more in the long run" :shock: |
||
|
12-05-2015, 12:17 PM
|
|
|
Registered
Join Date: Aug 2008
Location: Alberta Canada
Posts: 181
|
You sure that your plugs are set at .07mm gap? That seems extremely tight, like almost closed. 7mm might be better.
__________________
Gary Kozun 83 911SC Cabriolet |
||
|
12-05-2015, 12:34 PM
|
|
|
Registered
Join Date: Sep 2005
Location: Clifton, VA
Posts: 153
|
Quote:
__________________
Scott 1979 930 - Black on Black and in the woods "My third child that will cost more in the long run" :shock: |
||
|
12-05-2015, 01:03 PM
|
|
|
Registered
Join Date: Aug 2008
Location: Alberta Canada
Posts: 181
|
Well then your eyes must bee really bad as the gap should be 7mm or 27 thousands of an inch.
 I usually gap the plugs at 30 to 32 thousands for n/a but if your a turbo then 27 thousands or 7 mm would be right.
__________________
Gary Kozun 83 911SC Cabriolet |
||
|
12-05-2015, 01:09 PM
|
|
|
Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,132
|
Quote:
79 is super special! |
||
|
12-05-2015, 01:12 PM
|
|
|
Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
|
Plug wires for sure if you never replaced them; they really suffer on a Turbo.
If you didn't send the injectors out for checking and cleaning, thats what you do right now.
__________________
Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
||
|
12-05-2015, 03:00 PM
|
|
|
Registered
Join Date: May 2003
Location: Detroit (Rock City!)
Posts: 783
|
Quote:
 1mm = ~.40", so 7mm would be ~.28" or over a quarter inch.
__________________
'90C4 |
||
|
12-06-2015, 06:16 AM
|
|
|
Registered
Join Date: Jan 2007
Location: Maple Bay, BC Canada
Posts: 263
|
Quote:
|
||
|
12-06-2015, 06:19 AM
|
|
|
non-whiner
Join Date: Aug 2012
Location: Slightly right of center
Posts: 5,235
|
Another possibility is cam timing on that bank. How does the engine run?
__________________
"Too much is just enough." |
||
|
12-06-2015, 06:26 AM
|
|
|
Registered
Join Date: Aug 2008
Location: Alberta Canada
Posts: 181
|
You are correct my math was terrible. Back to school for me and detention already.
.7mm should be the correct gap. Sorry. 
__________________
Gary Kozun 83 911SC Cabriolet |
||
|
12-06-2015, 11:33 AM
|
|
|
Registered
Join Date: Sep 2005
Location: Clifton, VA
Posts: 153
|
Quote:
engine runs great when it is warmed up. I am having an issue with the AAR. 1700 rpms on start up and after about 10 mins it drops down to 1250. Then after driving it for awhile it drops to 1000rpms. Which I did remove and then added back as it seemed to work better after cleaning it up and checking connections. I do have a buddies that I will put in to see if that is causing the issue for the next 500 miles... Thanks again all for your recommendations.. Cheers
__________________
Scott 1979 930 - Black on Black and in the woods "My third child that will cost more in the long run" :shock: |
||
|
12-07-2015, 02:51 PM
|
|
P911
1988 Porsche 911 Turbo
