OK, so I+ve finally got my car to pass the emissions test here in Sweden with my new cats, so far so good :-)
But I´ve gotten a new problem that I have NO idea whats might be causing it.
Sometimes the car fires up normally on all 8 cylinders, but instantly start running on maybe 3 cylinders, just shaking. During this the DBW throttle is completely dead. Sometimes I can just restart the vehicle and it runs fine again. But this problem has been coming more and more often. And today I could not get it running again by turning it on/off. So after a few tries I turned the main power off by the battery for a few seconds, and then BOOM the was running normally again when I turned the key...

I´ve been noticing strange "bogs" during low rpm driving, especially during cruising/street driving at slow speeds. It fells just like as if the fuel pump or ignition is temporarily turned off for a few tenths of a second. This sympom has also become more and more frequent.

So does anybody have any good ideas what to troubleshoot? I´ve only checked that all the connectors regarding the throttle are properly attached, and no obvious problem there..

 

Are you setting off a MIL light? I'd get a hold of a scan tool if possible and see if there are any trouble codes that can point you in a direction to begin looking.

I had a similar problem with my swap when I first finished it, ended up being a damaged pin on the C207 connector that was intermintently loosing connection on the pin that powered the coils and injectors for bank2. When this happened it dropped to 4 cylinders and then would come back to 8.

 

That sounds like a possible thing, the symptoms sounds very similar to mine. How did you se that the pin was damaged? Was it visible with the eyes or was it a "hidden" problem?
I have a little thing from EFI Live that I can record everything that the car/computer does, but I always have to email the file to a guy far away here in Sweden so that he can go through the files.
I can not really read troublecodes with it. My MIL light comes on from time to time, but has always been from the "cooling fan circuit malfunction" one of the two fan motors is getting tired...

 

Been scaning/recording every drive for today with my EFI Live auto cal. "Unfortunately" the car never died or refused to start during all my recorded drives today. But some misfires sure happened, and 4 troublecodes are triggered.
P0101
P0172
P0175
P0833

My "tuner" ( the engine is stock LS2 but he took out the VATS and some other thing to get this engine running in my car) have seen the P0101 before, and he says that it is normal and expected because I´m running a conical K&N air filter.
He also said that he would have to rewrite the whole aircurve for the filter to stop the ecm from popping up??
Regarding the other two, Rich mixture codes 172&175. I suspect this to be normal when a engine misfires as mine does sometimes, that would create a rich mixture for a second or so? But WHAT might be causing these hickups?

 

The p0101 is usuall caused by two things. First is a bad MAF. Second if the MAF doesn't match the tune. The 75mm 3 wire fbody MAF, 5 wire 85mm truck/ls2 MAF and ls3/7 card mafs all have different calibrations. An open element filter will not cause the code

The two rich codes likely are from the misfiring. Sounds like a loose ground, poor connection etc. Retest over bumpy roads or jiggle the wiring in different areas with the engine running

P0833 is cpp switch. Have your tuner turn it off or put a clutch switch in

 

Hi Pocket, thanx for the response.
The MAF in my Camaro is the stock LS2 GTO MAF that came with the engine when I bought it from Cleveland pick a part, it looks to be in good shape. And when the car is running good, it is running good with perfect AFR and really good good clean exhaust emissions..I got maybe 15" of 4" pipe in between my maf and the K&N conical filter too.
The tune in my engine is completely stock, because the engine has m´no mods at all, just bone stock 2006 LS2, so I dont know why it sets off the p0101..

We got plenty of rough streets here in Lapland Sweden ;-) But the strange part about the misfires is that they can occur anywhere..nice flat calm street and Im driving slowly in second gear and then it feels just as if I would turn of the ignition for a half second or so..
Today I´ve been continuing to record every drive I make, but the car has not started to run on 3-4 cylinders as it sometimes too. Would be interesting to see what wrong with it, IF I can see it in the computer files??

 

I'd find a different tuner then for the p0101 code

Let the engine idle and jiggle the harness by hand in a few areas. The misfire sounds electrical related, likely on the ignition side of things. The coil harness connections and respective grounds to the cyl heads are a good starting point

 

Thanx again Pocket :-)
Yeah I´ll do that tomorrow, have to start somewhere..
If I could find another tuner that knew how to tune american cars here in Sweden I would try + you have to pay for the EFI LIVE or HP tuners again for someone elses license.My tuner it the closest one, and he is a full 10-12 hour drive away...might have to do with the fact that I live in Lappland, equivalent to the top of Alaska ;-)