pwtr02ss
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Ahhh. I only hit it a couple digits up and it didn't seem like it was doing anything. This is at idle. I didn't want to keep going and mess something up
2004 6.0 NV4500 Tahoe
- Thread starter Dantheman1540
- Start date
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pwtr02ss
Full Access Member
My avalanche hangs the idle after it's warm. It'll eventually come down but it takes a significant amount of time. My solution was to not rev it in park lol
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Dantheman1540
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Definitely needs a tune, it’s probably not as miserable with an auto but having to feather the throttle constantly for me is pretty awful.
pwtr02ss
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coming soon. And yea, I don't notice it. The only thing I really notice is the dead spot somewhere around 1800-2300ish and the large gasp of air (best way I can describe it) it takes at start up. Other than that, it drives fine. Probably why Ive been dragging my feet so much
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Dantheman1540
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So odd, first test with the +.5 BIA had it hanging the revs everywhere however, this morning it was just stalling out everytime I'd coast to a stop. I didn't change anything but the weather is a bit cooler.
I also keep noticing these crazy readings from the MAF at idle, sometimes showing as much as 50% lean however looking at the log its only showing that lean after the idle settles down from its jumpiness. I guess I'll correct the MAF with this data this time and see what it does.
I also keep noticing these crazy readings from the MAF at idle, sometimes showing as much as 50% lean however looking at the log its only showing that lean after the idle settles down from its jumpiness. I guess I'll correct the MAF with this data this time and see what it does.
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Dantheman1540
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That dead spot could be cured with a hit of NOS.
pwtr02ss
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I do have an old TNT F2 kit that was on the camaro for yearsThat dead spot could be cured with a hit of NOS.
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Dantheman1540
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finally making some progress, basically added some air into the Idle>airflow>throttle follower>airflow table below 3.5% and it helped with the surging and stalling. Also switch to dynamic then to speed density to work on the VE table and I think the MAF might be dirty because the truck runs 150% better with the MAP active and 200% better with the MAF disabled.
I did have a very strange event tonight. I left from a light kinda hot in first gear and then really stabbed 100%WOT at 3k which in an instant had it at 6k where the engine light flashed on and the engine seemed to hit the limiter which is actually set much higher (6,500). I gently put it into second and all was fine and I did several other pulls later but keeping it below 6k. On the MAF graph im reading 10750HZ which is still 1,250 below running out of table. On the VE table it reads up to 1.05 but looking at the log the entire WOT pull is at 1.00. I think this is where the problem lies im just not sure how to fix it. DO I need a different MAP sensor? Or just a different operating system with more VE cells? I have never seen the cells actually want more than 97-99 in them but I have some upwards off 120 after correcting with my histograms.
I know some people end up needing a bigger MAF and obviously a boosted engine needs a bigger MAP sensor and OS but this isn't boosted so I'm confused.
I did have a very strange event tonight. I left from a light kinda hot in first gear and then really stabbed 100%WOT at 3k which in an instant had it at 6k where the engine light flashed on and the engine seemed to hit the limiter which is actually set much higher (6,500). I gently put it into second and all was fine and I did several other pulls later but keeping it below 6k. On the MAF graph im reading 10750HZ which is still 1,250 below running out of table. On the VE table it reads up to 1.05 but looking at the log the entire WOT pull is at 1.00. I think this is where the problem lies im just not sure how to fix it. DO I need a different MAP sensor? Or just a different operating system with more VE cells? I have never seen the cells actually want more than 97-99 in them but I have some upwards off 120 after correcting with my histograms.
I know some people end up needing a bigger MAF and obviously a boosted engine needs a bigger MAP sensor and OS but this isn't boosted so I'm confused.
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Dantheman1540
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This morning I got on it a tad and immediately got REP followed by P0068 (MAP/MAF - Throttle Position Correlation). I'm thrilled its not the standard "Your TB is a POS or your ground is bad codes". I have the MAF disabled tho so I thought this was odd, although having the MAF maybe only partially disabled would make sense.
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Dantheman1540
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I think I found my issue with the VE table not having enough cells. According to an HPT forum post multiplying the table by 1.25 should be plenty for a bolt on motor. Comparing my old stock 4.8 the table is more aggressive and my blown 6.0 tune has the entire table set to 4.0. So I guess I don't fully understand the table but ill do 1.25 and see wtf happens.
