Ahsai

That is quite interesting because if that valve leaks, it could leak air or fuel vapor depending on the current fuel vapor concentration and it would move the RKAT value from 0.0 either way. You can use a hand vacuum pump to test that valve btw.

DrMEMS

I'm still having rough idling. Curiously enough, turning on the air-conditioning compressor actually smooths out the idle because it increases the engine speed just enough to make it smooth (and the compressor running normally is rough).

I'm now getting a CEL code for low bank 2 catalytic converter efficiency, so I'm taking another look at the fuel-trim values. After driving for 40 minutes, I used my Durametric to read the trim values. Banks 1 and 2 are quite different for "adaption ranges" 1 and 2.

Idling engine speed = 730 rpm, but varies a bit
MAF = 17.0 kg/hr

Camshaft deviation
Bank 1 = 6.3 degrees
Bank 2 = 0.1 degrees

Adaption range 1 (near idle; RKAT)
Bank 1 = 1.69
Bank 2 = 1.45

Adaption range 2 (lower load range; FRA)
Bank 1 = 1.06
Bank 2 = 1.08

FRAU
Bank 1 = 1.06
Bank 2 = 1.08

Adaption range 3 (upper load range; FRAO)
Bank 1 = 1.03
Bank 2 = 1.02

I need help interpreting the values. I think that RKAT, FRA, and FRAO should all be near 1.00.

Ahsai

The bold number can't be right! The RKAT is in % so ideal value is 0.00%. all the other FRx needs to be close to 1.00. If you get 1.69, that means the DME is adding 69% more fuel in that load range!

DrMEMS

You are correct! I had typed in the same value twice. I fixed my original post.

Ahsai

I figures it got to be a copy and paste error. Your corrected numbers look ok to me. Does Durametric still show misfires?

Mark in Baltimore

Guys, please, no name calling. Also, please don't post personal information.

Everyone take a deep breath. Thanks.

gnat

One thread this week wasn't good enough Pete? You really needed to reopen the bickering over here? I have no love for Martin, but your sniping at him is just as bad as the BS he throws at Jake. Unless you have something concrete to say, just ignore him. You have plenty of good things in your life to spend time on, stop wasting it on Martin.

Noz1974

Back to the problem in hand I noticed on the durametric readings the can deviation on one bank is almost zero and the other plus six, this seems like there's a problem with this bank , vario paddles , can cause rough running might be worth looking into??

DrMEMS

After the rebuild, the bank 1 camshaft deviation was small (I have forgotten the number). When the old cylinder 1 intake valve lifter started sticking, I had all six on that bank replaced. The indy Porsche mechanic saved me $2000+ by doing the replacement with the engine dropped down, but still in the car, rather than removing it. He told me that the first time he ran the repaired engine, the timing was off because the Porsche timing tool wouldn't fit with the engine still in the car. He dropped the engine again, adjusted the camshaft position, and reassembled it. He said that it was fine; I say that it's not. As I understand it, this is right at the edge of the Porsche spec of maximum 6 degrees error.

I don't know whether this will cause rough idling (but fine when revved up a little). I'd like to hear from anyone that has had an M96 engine with the same camshaft deviation.

Mark in Baltimore

Martin, stop. Now. You were warned.

Step away from the keyboard and go hug your partner, dog, cat, goldfish.

I'm closing this thread for a bit until everyone's blood pressure levels drop to sane numbers.

DrMEMS

I'm still here and still trying to get my engine idling smoothly. I have gotten some good information--and some misinformation--from the community's posts.

Mark in Baltimore

Everyone here should read this link: https://rennlist.com/forums/991-turb...e-posting.html

Specifically, the charter (https://rennlist.com/charter/), a part of the aforementioned URL, addresses conduct:

I'm posting this in case anyone feels that they can say anything they want to whomever they want, whenever they want.

Thanks for understanding. Let's keep it nice, all.

Mark in Baltimore

I just re-opened this thread. If there are anymore name-callings, threats, postings of personal information, etc., infractions and/or vacations will be given. I gave all involved last week a free pass. Everyone, including members, users, moderators and sponsors, agreed to the charter and the expected code of conduct.

Don't like what someone says? Argue with the idea but don't insult the member. If things are getting really nasty, please hit the "Report Post" button and don't contribute to the negative actions. We are all here because of our love for cars and Porsches, so let's not lose sight of that essential factor.

Have a great week, folks.

Slakker

Thanks Mark. Again, apologies.

RngTrtl

No offense intended but yall (the mods) are way to lenient around here. People post way OT stuff all over RL and it is this type of allowed behavior that gets you threads like this. Yall need to whip out the banhammer.