I have an '03 Z06. I had installed a Blackwing filter and new air duct with silicon sleeve. I have noticed that the car has a chugging sensation most noticible in second and third gear when just barely touching the accelerator. The car performs fine above 3500 RPM's.

I just re-installed the factory air box and duct work to see if that makes a difference. I took a short ride and it does not seem to be 'as bad' but does the computer need to re-calibrate itself?

Has anyone else experienced these symptoms? Any help would be appreciated.

 

Believe it or not, many screenless MAF-equipped C5 exhibit this behaviour after an aftermarket intake is installed. Typically, a lean code is displayed.

According to Jim Hall of Halltech,

"This type of code happens as a result of the screenless MAF sensor, which is a poor air meter without the laminar screen.

At low rpm, the airflow going into the MAF is more turbulent due to the throttle plate being mostly shut, causing some air to be missed by the MAF and subsequently measured at the O2 sensors instead.

The difference between the measured air at the MAF and the actual Oxygen left over at the O2 sensor creates longer fuel trims to make up for the new measurement. This creates a long term trim in that particular fuel cell, which if 24% is reached (easy to do without a screen) the codes you mentioned pop.

You can reset the PCM, but better yet, pull the negative side of the battery all night to reset the LTFs.

This should solve the problem.

If they come back, you can install the 2001 Z06 MAF sensor, or reprogram your PCM for the LTF problem.

THIS CONDITION WILL NOT BURN PISTONS!

Another option is to go back to the stock setup, but the former recommendations should be tried first.

This condition is never reported in the LS1, or 2001 Z06, since the MAF used has the proper laminar screen in place. Just like a wind tunnel laminar screen.

I understand that the 2005 LS2 will be going back to the laminar airflow screen as well."

Jim Hall

 

It seems that unplugging the batter will just elimiate the code. I do not have a code comming up, I want to eliminate the chugging. Does unplugging the battery reprogram the sensors to correct the longer fuel trim that must be causing the chugging?

Do you think an after-market recalibrated MAF sensor would correct the chugging?

 

DO an advanced search on PCM relearn...

YOu PCM needs to relearn the fuel trims for the new increased air flow... I am out of town and don't have access to my files but there are two fuses you need to pull with the key in the on position, yo then need to drive for at least 50 miles at various speeds/rpms to complete the PCM relearn

 

I would love to know this exact procedure as well. If you could post it when you have a chance that would be awsome!

Never mind.....I found the procedure in the search under " PCM Realearn "

Thanks!!

 

From another member's post......

"Pull the #25 fuse in the I/P fuse box with the car off but the ignition on. The fuse box is under the removable panel by the passenger's feet under the mat (the hatch is velcro'd in so just pull it). The lights will go off when you pull the fuse so have a flashlight handy. This will cause your BCM to reboot when you plug it back in (be sure to wait 15 seconds). Turn the ignition off and then restart the car. You'll have to clear the codes by cycling through them and holding reset."

Typically, driving 50 miles or so will eliminate surging if there are no codes. However, that screenless MAF may not allow this to happen.

 

In SIGS original post, he does'nt mention anything about having a screenless MAF. ??

 

All 02-04 Z06s have screenless MAFs (from the factory).

 

You may have introduced a leak after the MAF maybe forgetting a hose that had been removed or air duct not sealing. The learning process after a small change should be near unoticable.