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6.0 LS running poorly
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<blockquote data-quote="wizzo" data-source="post: 517922" data-attributes="member: 125"><p>6.0 LQ4 has EFI live tune and drive by wire. Engine was freshened up probably two years ago. Running problems started a few weekends ago at Harlan, we had ridden all the weekend and then Saturday night on Jagger it started to stumble/ hesitate/ miss right off of idle. You could push through it but the power was lacking. Got it home and put a snap on solis? scan tool on it. It was running rich and smoking a little. Had a code for the heater circuit in an 02 sensor but that was it. I put new plugs in it. Took it to a county fair race event and it was really running bad. So at that point, I put two new 02 sensors in it. Took it to another fair race event and it ran better but still not right. Now I'm getting a P0171 Chevrolet Fuel Trim System Lean Bank 1. Put a new fuel filter in it. Went to GMP this past weekend and swapped the MAF and MAP sensors and no change. Unplugged the MAP for a bit and it ran pretty good for a while but then back to the same deal. When I was on hellavator (for those that don't know, it's a rock slab and the transition at the bottom is rough so you bounce up onto the rock slab and try to climb up) as soon as the rear hit to bounce up, I would loose all throttle. The engine wouldn't die but when i hit that bump it was like there was no throttle input. Another thing I noticed this weekend was that the engine was running up at 210 and it normally runs 180.</p><p></p><p>What I have replaced:</p><p>New plugs</p><p>New 02's</p><p>New fuel filter</p><p>Swapped MAF & MAP sensors</p><p></p><p>We've checked the fuel pressure with gauge on rail multiple times</p><p>checked for vacuum leaks by spraying cleaner all over engine</p><p>ran a crank/ cam position variation relearn</p><p>checked fuel trims, etc. pretty much any test you can do on my buddies snap on scanner</p><p></p><p>What is also weird is that it will not pick up miss fires or throw miss fire codes.</p><p></p><p>Any thoughts?</p></blockquote><p></p>
[QUOTE="wizzo, post: 517922, member: 125"] 6.0 LQ4 has EFI live tune and drive by wire. Engine was freshened up probably two years ago. Running problems started a few weekends ago at Harlan, we had ridden all the weekend and then Saturday night on Jagger it started to stumble/ hesitate/ miss right off of idle. You could push through it but the power was lacking. Got it home and put a snap on solis? scan tool on it. It was running rich and smoking a little. Had a code for the heater circuit in an 02 sensor but that was it. I put new plugs in it. Took it to a county fair race event and it was really running bad. So at that point, I put two new 02 sensors in it. Took it to another fair race event and it ran better but still not right. Now I'm getting a P0171 Chevrolet Fuel Trim System Lean Bank 1. Put a new fuel filter in it. Went to GMP this past weekend and swapped the MAF and MAP sensors and no change. Unplugged the MAP for a bit and it ran pretty good for a while but then back to the same deal. When I was on hellavator (for those that don't know, it's a rock slab and the transition at the bottom is rough so you bounce up onto the rock slab and try to climb up) as soon as the rear hit to bounce up, I would loose all throttle. The engine wouldn't die but when i hit that bump it was like there was no throttle input. Another thing I noticed this weekend was that the engine was running up at 210 and it normally runs 180. What I have replaced: New plugs New 02's New fuel filter Swapped MAF & MAP sensors We've checked the fuel pressure with gauge on rail multiple times checked for vacuum leaks by spraying cleaner all over engine ran a crank/ cam position variation relearn checked fuel trims, etc. pretty much any test you can do on my buddies snap on scanner What is also weird is that it will not pick up miss fires or throw miss fire codes. Any thoughts? [/QUOTE]
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