04-11-2017, 10:22 AM
|
#1
|
|
986
Join Date: Nov 2016
Location: Hamburg | Germany
Posts: 21
|
Misfires
The entire left bank misfires & the car runs rough. O2 replaced, MAF cleaned, new coils etc, no effects. All fuel injectors seem to be working ok (did a hearing test)
Any ideas? And does anyone know what "Oxygen sensor heater" exactly is?
__________________
– Konstantin
2000 Porsche Boxster S, Rainforest Green
|
|
|
|
04-12-2017, 07:46 AM
|
#3
|
|
I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,432
|
The O2 sensors have a sensor and a heater. There's 4 wires to each. Fuse?
__________________
'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
|
|
|
|
|
04-12-2017, 08:00 AM
|
#4
|
|
Registered User
Join Date: May 2014
Location: S.California
Posts: 2,029
|
The first thing to check is that you fitted the correct parts. Both the plugs and coils are different in different engine size/year. Some differ by just 1 digit !
Next the connectors on the coils. Unless you lubricate the cover/sheath and push it back to make the connector 'click' into place - that may be an issue.If you don't do this you may have poor connection at the coil and you will swear it is perfect.It isn't.
If you mean Bank 2 (left?? that will be confusing) check the wiring harness. Almost impossible because of the congestion - but use a small ,powerful LED Inspection Lamp. You are looking for rat droppings and maybe loose ground by Cyl #4(brown conductors on a stud).
Next stage is the flailing - swap #4 plug and coil with #1 - does the problem follow? Suggest you find the dwg of the Bank/Cylinder layout to make the diagnostics unambiguous.Using Left/right ,front/back will lead you up the garden path.It really confuses the 996 guys.
Good Luck !
Last edited by Gelbster; 04-12-2017 at 08:03 AM.
|
|
|
|
|
04-12-2017, 09:35 AM
|
#5
|
|
Multi-Boxer Driver
Join Date: Nov 2010
Location: Orange Park, FL
Posts: 1,422
|
Also make sure the coil packs are seated fully on the plugs, and that the wiring harness connectors are firmly locked on. I had a misfire a few years ago when I did spark plugs, and turns out I didn't seat a wiring connector and thought I had bigger problems. 
__________________
-Chris
2004 Porsche Boxster 2.7 (gone  )
2004 Porsche 911 C4S Cab
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
|
|
|
|
04-12-2017, 10:30 AM
|
#6
|
|
986
Join Date: Nov 2016
Location: Hamburg | Germany
Posts: 21
|
thanks for these suggestions, will check it. Well, I'm not sure what the bank number this is, but what I mean is the bank with cylinders 4-5-6 as on this drawing:
__________________
– Konstantin
2000 Porsche Boxster S, Rainforest Green
|
|
|
|
|
04-12-2017, 06:26 PM
|
#7
|
|
Beginner
Join Date: Mar 2013
Location: Houston
Posts: 1,659
|
Quote:
Originally Posted by boxpriest
thanks for these suggestions, will check it. Well, I'm not sure what the bank number this is, but what I mean is the bank with cylinders 4-5-6 as on this drawing:
|
Bank 1 has cylinders 1,2,3
Bank 2 has cylinders 4,5,6
__________________
2003 S manual
|
|
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is On
|
|
|
All times are GMT -8. The time now is 04:37 AM.
| |
Boxster
Linear Mode
