Just recently threw a bunch of ls2 parts on my ss silverado (heads/cam/intake) tuner is having a hard problem getting it to idle...says truck computers have less parameters than cars..is this true? Need a new tuner?

 

It's not a ECM issue. The SS Silverado has the P59 ECM which is 1 MB (megabyte) RAM computer. My LQ9 has the older P01 ECM with only 512 KB (kilobyte) of RAM and it idles great with a 231/234 .629/.615 111 lsa camshaft.

What throttle body are you running? The china knockoffs can be a bitch to tune.

 

Don't think I've seen an ECM with so few parameters defined that it wasn't possible to make it idle. Posting the file would tell us for sure.

 

We did ported 243 heads...fast 102 intake nick williams 102 tb, ls2 btr stage 4 updated fuel system replaced a bunch here and there...i wonder if i can just swap the ecm for a ls2

 

Wish i had the file could probably figure out the problem on here

 

You don't need to do any of that, you need a better tuner

my 02 C5 and Tahoe have the exact same ECM; he's full of ****

most LS2 ecms are going to be E series as well if I am not mistaken

 

I should also mentiom it does idle in park or neutral. Once it warms up it will stall in drive or trying to pull up to a light... i feel like this is a pretty straight forward built though not anything out of the ordinary aside from using ls2 parts

 

If your "tooner" is doing proper base running airflow tuning with the right PIDs and graph, he should be able to get it to idle with a new cam in about 10min. It's not that hard to do.

As others have said, find a new tooner.

 

The Nick Williams TB is a quality piece and should be easy to tune for idle. You have options since you're only dealing with idle issues. Of course find a new tuner, buy HP Tuners and a wideband and sort out the issues yourself, buy HP Tuners and a wideband then have a "remote" tune from a well known tuner like our forum moderator Atomic Performance

Without the above options you are limited to only one thing you can try...

To add more idle airflow turn the idle stop screw on the TB in clockwise starting with half a turn. > unplug the IAC & TPS sensors > turn key to on position (no start) for 30 seconds to reset the sensors > turn key off > re-plug in sensors > start engine > drive > repeat if necessary.

This procedure will crack the throttle blade open further allowing more idle airflow. If you go to far in on the stop screw the idle will hang coming to a stop. You then reverse the procedure backing off the screw then resetting the sensors again. This is the exact procedure a tuner does setting the IAC counts but he has HP Tuners logging the counts making it easier to dial in.

 

How you going to do that on a ETC.

233/248 111.5 LSA. I don't see a higher stall torque converter in your list.What is the idle speed in gear set at? That cam is going to need a high one and not like a tight stock converter.