Tuning help for 09 Silverado with Cam

[[email protected]]

I need some help please. I have a 09 Silverado with the 5.3. I just recently installed a Comp Cam 54-418-11 224/228 0.534 int./0.537 exh cam. The problem that I am having is, I keep getting the check engine light on complaining about the motor running lean after the cam install. I have called comp cams about the problem and all they will tell me is that I have a tuning problem. I then called Summit Racing about buying new 36# injectors for the truck since the truck only has stock 20# injectors installed. Their tech support told me that I don't need bigger injectors but per their Comp Cams notes, I have the wrong intake on the motor. Summit said that I needed the 6.0 litter intake or a FAST intake, not bigger injectors per Comp Cams. I currently have the stock 5.3 intake on the motor. I have logged the injector percentage duty rate. The most that I’ve seen the duty rate was at 81%. I am also using the HP Tuners Beta software. I don’t know what to do. I can’t get the same answer from the two companies.

[Bill@HPTuners]

What dtc's are you getting?

[Bill@HPTuners]

According to the ifr table it looks like those are actually 36# injectors, not 20lb.

[[email protected]]

DTC is Bank 1 &2 Lean
How can you tell that they are 36# injectors. I'm still learning.

[PitchblackC3]

If you are lean, the intake isn't the problem.

[[email protected]]

Thats what I told the Tech support at summit. How was adding more air into the engine going to correct the lean fuel condition? He finaly agreed with me.

[Bill@HPTuners]

The Injector flow rate table tells you what the injectors were originally setup as.

What DTC code? P0171? etc. In my experience p0171/172 type codes are caused by maf issues so thats the first place I look.

[[email protected]]

Bill, I am getting P1174 followed by P0300.

[Bill@HPTuners]

I've honestly never seen that code throw before(p1174) maybe someone other than myself has experience with it.

P0300 is a general misfire code that usually pops up when an aftermarket camshaft is installed, thats pretty normal.

[[email protected]]

Ya, from a little need web search. From what I have found from a colbolt site is that I may have one or more injectors clugged. I just wonder if the warranty will cover that after the cam I installed.

[Russ K]

Not sure how your getting a lean code when the fuel trims are negative. Should have a rich code, not a lean code.

Russ Kemp

[Bill@HPTuners]

Russ from what I can tell the problem is the o2 sensors are just dead for portions of the scan, for instance frames 16128-16711 the o2's just hover at 50mv or so.

[Russ K]

Ok, I see that the O2's are not switching properly at idle. Set the idle to 750 rpm, then tune the Maf to get the fuel trims closer.

Russ Kemp

[[email protected]]

Thanks Russ K. I will set the idle to 750 and defiantly work on the MAF. The only reason I haven't adjusted the MAF was because I thought I needed bigger injectors and thought it would be a waste of time. But, I am going to work on that tomorrow. Again, thank you for taking your time to help me out Russ K and Bill.

[[email protected]]

I am also thinking about running a can of seafoam in a tank of gas. Maybe that will clean anything that maybe clogging the injectors.

[Blitzmann]

I am also thinking about running a can of seafoam in a tank of gas. Maybe that will clean anything that maybe clogging the injectors.

Dont run seafoam, just take the injectors out and have them flow tested. Seafoam = not good.

[IDRIVEAG8GT]

Dont run seafoam, just take the injectors out and have them flow tested. Seafoam = not good.

My gut tells me to agree.

[TexasGMC08]

I am getting a P1174 Fuel Trim Cylinder Balance Bank1 as well! What is this fix???