swap done

[paramediclane]

i finally have the swap from 5.3 to LQ9 in my 02 z71 suburban. also have the nelson performance tune. the truck is doing ok. it idles like shit and feels like it is skipping or only running on 5 cylinders. it surges all the time. not running smooth at all. the code reader revealed codes PO131 and PO171. before the swap and tune, the truck ran great and smooth. no problems at all. now with all the new stuff done, it runs like crap. my mass air sensor is clean and has the screen still in it. ive cleaned all the intake parts. stock intake and exhaust, just a k&n drop in filter. why am i having all these problems all of a sudden? i have no idea what could be making the truck run like crap. if i dont fan the throttle, the damn thing feels like its going to shut off !! please help me ! ! !

[TXcrew]

congrats! hows the new heart pupming so far?

[Red03SilSS]

<div class='quotetop'>QUOTE(paramediclane &#064; Oct 18 2006, 01&#58;22 PM) [snapback]70085[/snapback]</div>

i finally have the swap from 5.3 to LQ9 in my 02 z71 suburban. also have the nelson performance tune. the truck is doing ok. it idles like shit and feels like it is skipping or only running on 5 cylinders. it surges all the time. not running smooth at all. the code reader revealed codes PO131 and PO171. before the swap and tune, the truck ran great and smooth. no problems at all. now with all the new stuff done, it runs like crap. my mass air sensor is clean and has the screen still in it. ive cleaned all the intake parts. stock intake and exhaust, just a k&n drop in filter. why am i having all these problems all of a sudden? i have no idea what could be making the truck run like crap. if i dont fan the throttle, the damn thing feels like its going to shut off &#33;&#33; please help me &#33; &#33; &#33;
[/b]

Have you called Allen and talked to him about it? It could be a tune issue.

[SCIV]

P0131 02 Sensor Circuit Low Voltage (Bank I Sensor I)

P0171 System too Lean (Bank 1)

I would call Allen.

[paramediclane]

<div class='quotetop'>QUOTE(SCIV &#064; Oct 18 2006, 12&#58;57 PM) [snapback]70095[/snapback]</div>

P0131 02 Sensor Circuit Low Voltage (Bank I Sensor I)

P0171 System too Lean (Bank 1)

I would call Allen.
[/b]

do yall think that replacing the 02 sensors will alleviate the problem, or does it sound like the tune isnt quite right?

[kwkenuf]

Do you have a scan tool? Not a code reader but a scan tool. If so plug it in (or go down to a local AutoZone) and take a look at the real time 02 sensor values.. If they are continually changing between high 850-900 and low 150-250, thats good and your sensors are working. If one of them is stuck low and not responsive, then change that sensor after you verify that the injectors on that side are firing as they should .

You didn&#39;t mention how it runs when cold on initial start up. (02 sensors are not a factor in open loop before they get warm) Does it run fine then get worse or is it bad from the get go?

Also, since you have had the engine in and out, check for vacuum leaks (hoses not connected) On that same subject, how long was your 6.0 sitting before it got swapped? Are the injectors gummed up? You can verify this with the engine off by removing the injector connectors on that side of the engine and tickling each injector briefly with 12V. When you apply 12V to one pin and ground the other you should hear a distinct and audible "click"... if not, repeatedly apply and remove power until you do hear the click. If that doesn&#39;t unstick &#39;em, you&#39;ll need to remove and clean them. Every swap engine I have been associated with has had this issue (my engines sit for quite a while before I finish the swaps) so you might want to check it out......

[paramediclane]

<div class='quotetop'>QUOTE(kwkenuf &#064; Oct 18 2006, 02&#58;43 PM) [snapback]70108[/snapback]</div>

Do you have a scan tool? Not a code reader but a scan tool. If so plug it in (or go down to a local AutoZone) and take a look at the real time 02 sensor values.. If they are continually changing between high 850-900 and low 150-250, thats good and your sensors are working. If one of them is stuck low and not responsive, then change that sensor after you verify that the injectors on that side are firing as they should .

You didn&#39;t mention how it runs when cold on initial start up. (02 sensors are not a factor in open loop before they get warm) Does it run fine then get worse or is it bad from the get go?

Also, since you have had the engine in and out, check for vacuum leaks (hoses not connected) On that same subject, how long was your 6.0 sitting before it got swapped? Are the injectors gummed up? You can verify this with the engine off by removing the injector connectors on that side of the engine and tickling each injector briefer with 12V. When you apply 12V to one pin and ground the other you should hear a distinct and audible "click"... if not, repeatedly apply and remove power until you do hear the click. If that doesn&#39;t unstick &#39;em, you&#39;ll need to remove and clean them. Every swap engine I have been associated with has had this issue (my engines sit for quite a while before I finish the swaps) so you might want to check it out......
[/b]

i did talk with nelson performance, they are burning me a new tune. i will be taking the truck to autozone to have the 02 sensors checked before i replace one of them. like i said, they were fine prior to the swap. the injectors we used were out of the 5.3, so they arent gummed up or anything, as they were working fine prior to the swap as well. my mechanic will be checking for leaks tomorrow to cover that base. im not sure how long the engine sat prior to installation. i dont hear anything that sounds like a leak when i rev it up.