Unplug the cable that clips to the MAF sensor, this is the second time I have said this, as have others. If the car pulls hard with the MAF sensor unplugged, it could be the MAF. I'm not sure when you changed your plugs and or coils last, but after pressure testing, I would have probably done that next, especially if you haven't replaced them in a LONG time.

When you unplug the MAF, the ECU will use speed density in the absence of the MAF readings. It is SAFE to do perform this test. At least you can rule out your MAF.

 

In an earlier post in this thread, I did post that I ran it without the MAF plugged in, but no change at all. I then said that makes me think more that it is the MAF, but it tests out on spec. I didn't drive her much though. How much time would be needed for a thorough test? Read above to verify. I also posted above that my plugs have about 8K on them and I posted my coils packs are original. (Thinking coil packs now) Thx.
Oh, just a good tip. when you take the metal hose off the fuel filter, press the plastic fitting from the new filter on right away and I had no drips on the ground and minimal drips came out without depressurizing as you guys said. Easy as can be.

 

Must have missed it. You would know right away, no need for extended test. Where were the plugs and coils replaced last?

 

[QUOTE=BOOSTTT;4822185]OK...MAF voltage is 1.34 warm. That is within the normal range right? It was 1.04 not running, which I believe is also normal. Plz help. Are those value correct? where do I go from here?
The strange thing is that unplugging the MAF seems to make no change at all, which makes me think it's still the MAF. I'm not sure where to go from here.
Hot film MAF= 1.30V
Cam position 1 deviation= -2.59
Cam position 2 deviation= -5.28
Loss adaptation idle= -1.69

 

Like my post just b4 yours says. 8K on plugs and coils are original.

 

if there is any chance you are running the car with original 17 year old coils?

replace them and also the plugs ( use the bosch fr6ldc which are pre-gapped for the car. though if you enjoy fiddling with stuff? gap them at .027 ) and i would wager that will remedy your misfire.

you also mentioned that you "don't really want to change plugs every 10k miles". having a tuned 996 turbo and changing plugs every 10k miles is just part of the necessary joy of running a well maintained and "misfire free" 996tt. 10k is the most you'll get ( + or - ) from plugs on tuned 96t's and are a relatively short lived "wear item". i change mine annually. i do coils at a 3X ratio of plugs to coils.

coils crack and plugs fry if you "push" the car with regularity. there's just no getting around it. maintenance.

 

Well. I guess that's next on the list. No way iridium or platinum will do then? i don't mind the maintenance as long as she stays healthy and fast. So far so good. Those are the plugs I have in her now. I did not change the gap tho. Thx for the input.

 

I run these,
Protomotive prefers these, as does Marski over at 911 Tuning.

Probably best to go with what your tuner recommends.

 

I have never ever gapped my plugs on either my built 3.8 Mezger or my 4.0 Mezger. I used to run OEM FR6LDC plugs straight out of the box on my 3.8 and now use OEM Bosch 996Cup plugs straight out of the box on my 4.0L putting 720+ to the wheels. Zero issues ever. I think guys tend to overthink gapping of the plugs especially on stock block motors.

 

These are the best deal I can find and they supposedly fit under the No. 5 water pipe as they aren't so tall. Seen a few members say they use these. Anyone else? I'll probably get these. Does anyone know if they will need the longer bolts? Can't tell by looking. Thx

https://www.ecstuning.com/b-bremi-pa...760210400~bri/

 

read more carefully the product listing you posted - because it says right on the product listing that: "longer hold down bolts will be necessary. Also use (Qty.) (2) 900 385 025 01 bolts (6 X 40 mm) for each coil. (6 per car, sold individually).

my advice? just get the beru ( oem ) like most everyone else. then start a new thread with your next issue, since the misfires will be gone lol

Porsche Ignition Coil - With Spark Plug Connector - Beru ZS178

Note:=13px

Updated design with 31 mm long bolt tabs, (uses 6 X 40 mm hold down bolts). (6 per car, sold individually).This brand includes (2) 6x40 mm hold down bolts.

https://www.pelicanparts.com/catalog..._pg1.htm#item5

 

I had similar hesitation when I bought my car. I bought PlasmaDirect coils 8 years ago. Guaranteed for life - I haven't changed them since. They provide a better spark and are not as prone to failure (obviously) as OEM. People who have never used them often scoff and say that they are the same as OEM - they are not!

 

... and I too am a "believer" in slider's plasma coils, since he's had them as long as i've been babbling about coils and oil here lol.

i just never could justify spending 800 bucks on a set!

 

I ordered the 99760210400 coil packs which are supposed to be shorter. I don't see anything about longer bolts with these. Where are you looking? The link you posted has a different part number. I also called ECS and was told they are a direct replacement.

 

I also ordered the spark plugs you recommended JSBear. Exact ones. Do you know how long those are lasting on a tuned 996T?