Question about Porsche 911
Common problem on 986/996-987/997 models causing missfires on various cylinders is the insulation on the ignition coils cracks open due to the temp changes and when affected by moisture ie raining/damp weather will produce missfires. Easy to replace they are bolted directly to the camcover on top of each spark plug held on by two small allen screws.
Posted on Apr 29, 2010
The problem detected is basically multiple misfire , the misfire emission is just a consequence of the misfire.
Misfire can be caused by many problems, concerning spark, fuel, compression, and timing .
If misfire is always on same cylinders , this should not be related any timing problem.
You can start checking the sparks plugs and replacing them, also check the air intake and replace the filter, particularly if misfire happens at cold engine condition.
Regarding the spark plugs check also the wirings to the spark plugs , this are common cause for this problem.
If servicing the spark plugs does not fix the problem, check injectors, and ruen a fuell pressure and compression test at a qualified garage.
Posted on Mar 09, 2009
Most probably bad spark plugs or distributor cap.
You need to start from checking plugs, wires, distributor cap, ingnition control modul. Very first and cheap solution check the injectors by using fuel injectro cleaner.
Posted on Mar 07, 2009
Misfire :-------- try checking your 02 sensors /fuel pump and filter.
for 51 cylinder misfire :---
Change the coil. Period. Very easy to remove from the vehicle if it's a 4 cyl. Follow that spark plug wire from the spark plug to the other end. What it's attached to you should replace
for 54 cylinder 5 misfire :---First you have to eliminate the most obvious problems, like spark plug and spark plug wire. If you replace those and you still have a misfire, then it's a good idea to look for a vacuum leak in the intake manifold
Posted on Mar 07, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Oct 18, 2016 | 2006 Chevrolet Trailblazer
Apr 02, 2015 | 2004 Jaguar XJ-Series
Mar 05, 2012 | 2003 Mercury Grand Marquis
Oct 25, 2011 | 2002 Kia Sedona
Sep 24, 2011 | 1997 Buick LeSabre
Aug 25, 2011 | 2002 Jaguar X-Type
Jul 15, 2010 | 1997 Isuzu Rodeo
May 29, 2010 | 1997 Porsche 911
Jul 23, 2009 | Porsche 911 Cars & Trucks
871 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: