Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

hugo kohl

Contributing Members
  • Posts

    39
  • Joined

  • Last visited

Posts posted by hugo kohl

  1. 1999, 996, 140k

     

    I started out changing a leaking coolant reservoir tank.

    After completing this task I had misfire codes on all cylinders.  After changing the plugs, plug tubes and coils the misfire codes started "roaming" around.

    After removing and re-seating the coils and their plugs several times the misfire codes went away and were replaced by intake temperature codes and roaming emission codes accompanied by a rough idle.  I cleaned the idle control valve and for now the car is running well with no codes.

     

    I really enjoyed struggling my way through the exercise but have to wonder, Whats next?

     

    being able to get some great suggestions and experienced information was a tremendous help.

    Thanks Loren, Ahsai, brwilson, dbjoe996 for your guidance.

     

  2. My car is now re-assembled and the misfire codes have been replaced with new codes:

    P0102 MAF low voltage

    P0112 Intake temperature sensor

    P1319 misfire

    P1318 Cyl 6 emission related

    P1316 cyl emission related

     

    The MAF code was due to my disconnecting the MAF sensor.  Upon startup I have a very low curb idle  Approx 600 rpm  If I disconnect the MAF the idle instantly rises to 1200 rpm and than drops to a normal 900 rpm.  There is no obvious un-burnt fuel smell like before  Even though the engine is idling very low, there seems to not be a misfire issue anymore.  

     

    what diagnostic procedure or process should I follow now?

    I was thinking about cleaning or replacing the "idle speed air control valve"

  3. while reassembling the coil shield, then muffler on the passenger side of my car after changing spark plugs, tubes and coils I found this male plug dangling by itself in the passenger side of the engine compartment.  It is connected the the same bundle that the MAF sensor plug comes from.

     

    After about 30 min of searching I cant find where it might go???

    Any suggestions appreciated

    IMG_2366 (1).JPG

    IMG_2368.JPG

    IMG_2367.JPG

  4. Ahsai,

      I just tried your suggestion..

    I re seated the two coils that were giving misfire codes and restarted.  This time I have no codes but did have a low idle rpm and had to play with the throttle to keep it running.

    After about 30 seconds of low rpm idle i disconnected the MAF.  The idle went frpm 600 rpm to 1400 but hen lowered to regular 800 with no misfires.  I repeated connecting and disconnecting MAF several times with identical results.  After 5 min of idling and revving engine I still get no codes.  Tomorrow am I'l reconnect the mufflers see what happens.  I did expect to get a MAF code but it was never disconnected for more than 30 sec at a time.

     

    I appreciate the suggestion.  I'll keep you posted as info presents.  

  5. Thanks for suggesting that.  I went back and checked them all, and the electrical connections to all six coils are properly made as far as I can tell; as in, the male and female ends are properly seated and the protective boot is in place.  In this last start-up the car idles properly for a few moments and then goes into a rough idle.  By that I mean you can hear the engine missing, rpm drops to the point where you have to play with the throttle to keep it running and you can smell unburned gas.  However, after another short interval the rpm rises to normal range (900 rpm) for a few seconds and then goes rough again and I get the flashing cell and error codes telling me about misfires.  My conclusion is that I've got bad electrical connections or bad coils somewhere.  Is there a way to do a simple diagnostic that can determine if a coil is bad?   What I'm down to trying is removing all the coils and plugs and testing the continuity with an ohm meter.  Loren suggested that there are any number of things that can cause a misfire after changing plugs but I'm running out of solutions to try.  Any advice is much appreciated.

  6. I removed, inspected and reinstalled the #'s 1 and 3 coils and also added fresh dialectic grease to the end of the boots.

     

     Its worth noting that I never felt a "click" seating any of the coils.  Upon close inspection, the contact between the coil and the spark plug is a coil push spring.  I measured the distance between the end of the spring and the plug and they do make contact.  The conductive grease should help insure proper conductivity.

     

     Upon re-start I did not re-install the mufflers.  I did however get a new set of error codes for the #4 & #6 cylinder misfires with a flashing cel.  

     

    I then removed and reinstalled the #'s 4 & 6 coils and restarted and now get codes for the #'s 6 & 3 cylinders.

     

    could these problems originate at the power supplies feeding the individual coils?

     

     

     

  7. I doubt that the fuel lines got any dirt in them but its hard to know unless the injectors can be diagnosed as clogged.  

     

    My gut is improperly seated coils but Ill need to get it back up off the ground and broken down to reseat the #1 & #3 coils.  It smells, literally, like unburned gas is passing out the exhaust.  

     

    I was also thinking of starting without the MAF connected.  I inspected around the MAF for possible air leaks but dont find any.  

  8. The car runs rough.  It feels and sounds like its not firing on all cylinders.  the rpm is low (400 rpm) and will stall if you let it.  There is a strong exhaust smell of un-burned gas.

     

    codes are:

    P0300  random multiple cylinder misfire

    P0301  cylinder 1 misfire

    P0303  cylinder 3 misfire 

     

     

    I used Beru Ultra Spark Plug; 14FGR 6KQUs and torqued to 22 lbs as per instructions.  

     

    ill double check the coil packs for proper seating on the plugs as well as  but at this point I don't think they are cracked as I installed those screws with locktite and firmly "snugged".

     

     

  9. 1999, 996,  117k miles

     

    Due to leaking I recently changed my coolant reservoir tank, which involved disconnecting and re connecting 2 fuel lines..  Upon restarting the car I had a rough idle and CEL.  I purchased a $100b code reader, read a bunch of stuff online and decided to clean the MAF sensor, change the air filter, spark plugs, plug tubes and coils.    

     

     

    upon today's startup I get an erratic/rough/low rpm idle, flashing CEL and the following codes:

     

    P0102  mass air flow circuit low

    P1319 misfire emission related

    P1318  misfire cylinder 6 emission related

    P1315 misfire cylinder 3 emission related

    P1313 misfire cylinder 1 emission related

     

    Somehow I went from a leaky tank to some bad stuff based on a do-it-myself moment.

    I wonder if the coil packs might not be perfectly seated?

    I'm thinking a new mass air flow sensor and all four O2 sensors need replacing??  

    Please advise.

     

    Hugo Kohl

  10. you are correct that I removed coolant tank,  airbox, sai pump, coolant hoses and two fuel lines.

     

    everything went back into place fairly easily.  I am concerned that I didnt have this misfire or these codes before the tank swap.  It could be that I did spill some coolant on that side of the engine while removing the tank.  It is also true that the coil on the #2 cylinder is in horrible shape compared to the others...again, probably because past servicer chose to ignore it due to its difficulty to access.

     

    I cant find where the coil wires are attached at the other end.  I would like to check and make sure those ends are properly connected.  Is there any advice on tracing that?

  11. Ahsai

    Thanks for your suggestion.  I already checked this and there was no leak there.  Ive read other posts concerning these codes and examined the 6 spark plug coils.  The one in the middle on the driver side is in horrible condition.  I't was noticeably in way worse shape than the others.  Ive removed it and ordered a new set of plugs and coils.  I did notice though that this coil and plug are noticeably more difficult to remove than the others because of structural elements in the way.  It looks like several mechanics, over the years simply passed it by because of the difficulty in dealing with it.

     

     I hope this solves my problem but I'm open to additional suggestions.

  12. 1999 996, 120k miles

     

    I just changed the leaky coolant resivor tank and air filter.  when I restartted the cat I get a rough idle and the following codes:

    P1315 ignition coil 4 primary feedback curcuit

    P0305 cylinder 5 misfire  also misfires on cylinders 4 and 6

     

    I think these cylinders are on the opposite side of where the coolant take is.  I can only assume I've loosened something.  

    any help appreciated.

    thanks,

    Hugo

     

  13. On 10/22/2016 at 1:28 PM, Loren said:

    That is secondary air pump. It is required to meet emissions standards.

    Perfectly normal sound.

    Hello Loren,

    Thanks for the reply.  The thing that is unusual about it is that it has never done this before.

     

    I also get an intermittent sound from the engine compartment when I start the car.  It is a "screeching" sound that makes me think there is something slipping or rattling around.  I checked the serpentine belt and it seems fine.  

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.