Macster

Doesn't read like a crank shaft position sensor problem, reads more like a coil problem.

With misfire error codes and a flashing CEL that is a good indication the misfires were rich misfires. A crank shaft position sensor if it could cause misfires at all would cause mechanical ones.

But I would be reluctant without more evidence to advise you to have the coils (and possibly even the plugs) replaced. But I would be equally reluctant to advise you to replace the crank shaft position sensor.

tks12

I could see it being coil issue as well, but the 1 5 and 6 cyl threw me off on the coils, next time we put it back on scanner after driving it some more, it did not show misfires. I drove the car about 50 more miles yesterday after cleaning MAF, and nothing went wrong at all. i never felt any hint of a misfire either, but that said, the maf "looked" before I used the CRC maf cleaner on it, at least as much of it as I could see

Im going to pull plugs and look them over today, I bought new ones anyhow, not sure if they were replaced at the 60k or not, it was done at a Porsche dealership just before we bought the car buy the previous owner, all we know is that dealer said the 60k was done, we do not have the bill to see what all was done.
(IOW did they replace or just inspect them?)

Flat6 Innovations

After my query I figured the issue was the MAF. The camshaft deviations are concerning though as they are only 1.5 degrees from triggering a CEL and are already out of range for our specifications.

The MAF probably needs to be replaced and that horrendously dirty aftermarket air filter isn't helping anything. Cleaning a MAF only goes so far and your MAF appeared to be original equipment and should have died a couple of years ago.

The MAF cleaning will probably hold you over for a while.

Its odd having a local customer. Whats even more odd is a 996 showing up at our facility under it's own power. :-)

tks12

heheh it wasn't under it's own power by much <g>

im betting it was factory MAF, 72k miles on it over 13 years, keep in mind though she has put 12,000 on it since Nov when she bought it, heck it would have had a ton more if it weren't stuck at Hennessy for 5.5 weeks to NOT get repaired for the break in damage, Still irritated over that..
Anyhow come to find out, it is a cleanable filter AFE dry filter, it washed up real nice, wasn't as bad as it looked either (still very dirty though), definitely doing it's job not letting anything pass it, I still do not like that setup though and NEED to replace that "cold" air setup with a closed off one, my wife drives her cars everywhere, it's not a weekend driver at all

I have not changed the plugs on it yet, I wanted to drive it some more and be sure or see if it set the cel off again. I got some time to put some more miles on it over the weekend after cleaning the filter about 100 miles by end of Sunday, it did not set the light or start missing, so my wife took it to work two days now (another 200 miles no light, no missing)

When I drove it Sunday, it did feel like a slight stumble at lower rpm steady or slightly off throttle a couple times. so it will get some plugs and have a good look at the coils and boot, I'll need to see who stocks that stuff around here or order them though. her other car ('11 mustang GT) is up for sale this is her only car till next year

Thanks for the help, if I get caught back up in the next couple weeks, i would love a tour of your place, what I did see was nice neat and clean.

can I ask a quick question, what plugs do you guys use, I like ngk over bosh but only because I have had a couple bosh fail prematurely in other vehicles.


to tell the truth, I just hate to do the plugs without doing everything else right now. love to get it on a lift and poull the engine and give her a few repairs and possibly even an upgrade or two <g>
thanks
Tom

tks12

BTW car did this again, put it on a OTC scanner and got a P1238 manufacture control fuel air metering along with the 300, 301 cyl 1
306 cyl 6 305 cyl 5 303 cyl 3 304 cyl 4

not the plugs though

not sure about the p1238 code now

it;s been hectic here so have not had time to deal with it at all, but it needs to get done asap now

any suggestions?

Macster

Well, my sources disagree. One (renntech.org) points to the #6 injector, the other one (a printed manual) points to the #2 injector.

The printed source has this: P1238: Injector circuit cylinder 2 - interruption.

The common theme is fuel injector.

tks12

I got conflicting ones as well but you may be on with the inj 2



I wish I could just get it someplace to get it repaired, I really do not have the time to do it

(edited)

talked to a shop that might be able to look at it, but said probably coils at this mileage, I really want to "know" what it is before I start sinking big bucks into it, might be hard to get it to them anyhow, at over 300 each for coils I sure hate to "waste" that money until I know for sure what is up...

(update) I called dealer about coils, seems they are not near that price?? at 80 bucks a pop by VIN of our car? (posted a new thread about the maf though)

she loves the car, but she really thought about selling it and getting a newer one

Flat6 Innovations

The misfire codes are being caused by an underlying condition that are creating the misfires. The misfire is often the symptom that is created by the problem, not the root of the problem. This is especially true when you have engine-wide symptoms like this that are not pin pointing a single cylinder and no others. I see this happen all the time when people believe that a code is specific to one issue and they look at the things directly related to those codes rather than what can create a condition that makes those conditions show up.

Based on that I'd say that you probably need a MAF sensor. I have a whole bunch of good used coils, if you want to try that I'll sell you asset, but I'd bet the condition comes back.

We can certainly repair this, while its not what we generally do (engines typically come here with parts expelled from them) we'll always help a local Porsche owner.

5CHN3LL

It takes all of 5 minutes to swap out the MAF...

tks12

I did call your place earlier today, to see if you carried parts like this, and did mention if you do this stuff there, I have got to say had I spoke to you earlier today, the car would had been there today! I hate throwing parts at something. I got one more coil off tonight, it looks to have a slight sign of a crack in it, I did have my wife get coils, MAF and the oil tubes down in Marietta. I did have some oil in one of the tubes

hopefully tomorrow I can get this finished up. (still haven't pulled the plugs, will in the am , be interesting to see what they look like) - BTW this a pretty easy job, be real easy on a lift.......

I still have not found a Air box for it, then again, I have not tried really hard,

on ebay last I looked someone wanted 200 for one on there.

fpb111

Looks like a complete one is ~150+
http://www.ebay.com/itm/99-00-01-Por...p2054897.l4276

tks12

looks like i will be able to work on this today, two more coils visibly cracked so three out of 6 but no signs of arc anyhow does everyone always replace the plastic oil boots and o-rings? I figured why not since im there but a couple are bone dry...

tks12

thanks

ill see how this thing runs before I have one shipped to me

tks12

so now that I am looking at this closer, which direction should the maf be turned, on the factory air box it can only be installed one direction, but on the KN it looks like the block could be installed 180 out so does anyone know for sure?

Adker

The sensor has to face the airflow the same way it did in the stock airbox...very important. Look at around 7:00 in the video to see which way the open end of the MAF points. Note that the MAF connector boot also need to be rotated to connect to the MAF (8:20). The K&N filter can be cleaned, if is as dirty as stated by Jake, you might want to do this next. Be careful on how much oil you add to the filter after you clean it. It can get on the MAF and stop it from working correctly.
http://www.knfilters.com/video/KN_Ai...r_cleaning.htm