So I have a 2006 sierra 1500 with an L33, tsp 212/218 cam, NNBS intake with the 36# injectors, x-link harness and GM 87mm throttle body. Since I put the intake on my engine would bog out and break up under 2,000 rpm. After that it runs great. But I've tried replacing my MAF sensor, air filter, fuel pump, spark plugs and wires and injector cleaner. I've run out of ideas and don't know what else to do. Hoping someone here would have suggestions. Thanks

 

Has it been tuned at all?
Are you still using your old map sensor?

 

Yes, I have a custom tune and I got it retuned after putting my intake on. Also I bought a new MAP sensor when I bought the intake.

 

Which new MAP did you get and what part number is the TBSS intake? 2009+ use a different style of MAP than the 2008 and earlier intakes.

Scoggin Dickey explains the differences and why you can't use an adapter harness between the two sensors.

The GM 12580420 is the earlier TBSS with the old style MAP hold down.

 

I've got virtually the same setup, it is most likely tune related.

My tuner hadn't done many trucks with small cams before, took a little extra time to get it perfect under 2k rpms

 

I've got the older style MAP sensor. The part number is 09359409. I remember I had to make my own hold down for the sensor. I can't find the part number on the intake but I believe it was from a 2010.

 

I thought it was a tuning issue at first too, but I sent multiple data logs to my tuner and my truck ran great when I had the cam in. But my problem only started after I swapped my intake.

 

There's a forum for this kind of problem....

 

And we're going to assume that all those logs were collected AFTER the intake swap ... ??

Changing the intake is highly likely to change the fueling requirements. Re-tuning tends to be required by doing such a thing. What changes to the tune have been made since the intake swap and the beginning of the problem?

 

I've sent at least 4 data logs to my tuner after my intake. Idk what all he has changed but I know that he changed the flow rate for the injectors and something with the airflow.

 

If you didn't change injectors I don't see any reason to change the flow rate. For what it's worth when I swapped from the old truck intake to the TBSS and a Nick Williams 90mm... my truck ran perfect on the old tune. I did some data logging and applied some slight airflow adjustments in the tune. Did you use new intake gaskets? How about the intake bolts? I removed the rubber from the factory bolts. I would try unbolting the intake, lift and reset. Carefully re-torque to specs using the factory tightening pattern.

 

If your tuner is struggling to tune a cam that tiny, you really need to find another tuner. There are stock cams that are bigger than that. I swear, everyone that owns a laptop thinks they’re a “tuner” now.

 

I put bigger injectors in. Went from stock 26lb to 36lbs. Originally I used the factory intake bolts and had a vacuum leak. I bought new summit racing gaskets and bolts and retorqued my manifold to spec. That seems to have fixed my vacuum leak