Update:

I replaced the front O2 sensors, cleaned the MAF, this made a small difference, not enough to pass the emissions test. The tester advised me to heat up the cats with a few acceleration runs, perhaps that would do the trick, and to my surprise it did, the car passed the emissions test.

I ...

it could also be the MAF sensor itself went bad.. not uncommon, have seen it happen before.. or as mike mentioned, the O2 sensors...


I will clean the MAF sensor again this week, if that doesn't help I will install new O2 sensors. The O2 sensors have been on the car since new, perhaps 11 years of ...

I have changed the plugs, the wires, and cleaned the MAF with a special MAF cleaner.

Monte is right, it must be something on my car, his tune has worked flawlessly for years.

I am baffled and do not know what to do, that is why I asked for advice.

The search for a solution continues :normal ...

(Excuse my English, it's not my native language)

I drive a 2005 Corvette C6 with a few modifications and a custom tune from Monte. The past few years I had massive problems passing the yearly CO test. the values are to high. I have tried to get my head round this problem, numerous attempts to find ...

trinity reads trouble codes, none of those are trouble codes and it seems they did not trigger any codes in the vehicle.

OK....

So presumably there is a difference between trouble codes and error codes, I didn't know that. So the Trinity doesn't read these and there is no way of knowing which ...

When I drove my 2005 Corvette C6 backwards out of the garage three errors showed up in the DIC:

Service Anti Lock Braking system
Service Active Handling System
Service Traction Control System

I stopped the car, left the engine running, and with the errors still visible in the DIC I plugged in my ...

I heard back from Monte, log-file is perfect, no lean issues anymore

I'm so happy, this problem has been bugging me for ages.

MONTE thank you very much

Best regards

Fred

no you didn't.. I didn't get any file from you..

I'm sorry, this forumsoftware hates me, it seems despite the fact that I see messages send in my outbox that they are not realy send.

I have send them to you via normal eMail.

Can you PLEASE have a look if the problem is now sorted or still there ...

The car was tested on equipment from a different shop and with those readings it would pass the mandatory emissions test.

So the emission test problem is sorted, now there's the running lean problem. I made a new log-file which I have send to Monte.

06MonteSS wrote:that difference is normal.. they won't be exactly the same... there's no issue/problem there...

OK, thank you Monte, maybe it's time to buy new O2 sensors, the car has done 85.000 miles.

To be continued, I will post results here when I find out what it was (or not)

Fred

get a can of CRC Mass Airflow Sensor Cleaner .. and you spray the maf sensor wires to clean it...

Today I changed the oil + filter and cleaned the MAF with the CRC Mass Airflow Sensor Cleaner. Unfortunately when we tested the emissions they were still the same. I did notice something that might ...

OK....you need a custom tune :)

he's got a custom tune already.. I did a tune for that car back in 2012.. so it's been fine for the 3 years since the tune was done, heh.. car has been fine all this time, and the tune doesn't change, unless you changed it or changed something on the car since then ...

any mods on the vehicle?
I'm sorry for not answering sooner, somehow the forum doesn't send me an email when there's a response.

Mods are:

Callaway Honker
Ported throttle body
Ported intake
Crane Cams 1.8 ratio rockers
Kooks Jet Hot coated headers
Pfadt Johnny O'Connel shocks
Hotchkis sway bars ...

I drive a 2005 Corvette C6 with the LS2 engine. Over here in the Netherlands all cars have to be tested for emissions every year, and so far this was never a problem.

Without changing anything to the engine this year it seems the car is running way to lean, therefore the lamba is to high, and the ...

Please excuse my English, it's not my native language :oops:

I had a problem passing the mandatory emissions test with my Corvette C6 and modified tune, as a last resort I installed the original backup tune and passed the emissions test.

After the emissions test I installed Monte's custom tune ...