Farmers didn't trust the oscilloscope. Thought I was trying to sell them something with that high tech machine. But a ball of flame! Now that's something they understood.
Farmers didn't trust the oscilloscope. Thought I was trying to sell them something with that high tech machine. But a ball of flame! Now that's something they understood.
Wow, now thats pretty funny! I never thoght about trying that to trace down an arcing plug wire. I can get my hands on a scope! I may just go that route. I did make some progress today though. I changed out the plugs, wires, cap and rotor. The plugs were pretty funky looking. I thought for sure I had it. The truck runs 1000 times better but I still have a small miss that comes ond goes. It runs really good up top, but down low when I lug it, I get a small miss. I do have an extra coil, I may stick it on before I spend anymore money. The wide band does seem to go nuts when the miss/flutter happens, like you said it will not pick up the un-burnt fuel and show as lean.
I have a nice timing light too, but I did not think about moving it around to different wires.
I still think my Dizzy may be suspect too. Summitt has a nice billet replacement and a set of 8.5 wires that may be comeing its way. Then I will just take the other stuff back.
Last edited by 96lt4c4; 07-30-2012 at 05:59 AM.
-1999 Hugger Orange SS, LS2 402 T56, 9 inch Ford 3.90 gears, Tuned with HP Tuners
-2002 Cavalier, Tuned with HP Tuners
-1994 Full Size Blazer ,383 TBI 4L60E, 4.10's, Tuned with Tunerpro RT (Where it all began)
I went ahead and started over on my tune this weekend. I think I had 2 things going on. The cap, button, wires, plugs, module, and coil got rid of the miss. But, that lean pop was still there. I logged the truck with my LM1 running through my Autoprom and pin pointed some lean spots along with the help of the BLM's and the Datatrace trace feature in Tunerpro. I have to say that is really cool. That was the first time I used it and it was a big help. I also went ahead and modded the FPR and now I have a solid 15 PSI fuel pressure. I think that really helped the idle quality, its really smooth now. I do not ever remember the truck idling this smooth since I put the motor in.
I think some of the lean pop is coming from not enough AE, I went back and looked through some of my old tunes and I was using a lot more AE so I am going to give that a shot. But, I am getting closer.
-1999 Hugger Orange SS, LS2 402 T56, 9 inch Ford 3.90 gears, Tuned with HP Tuners
-2002 Cavalier, Tuned with HP Tuners
-1994 Full Size Blazer ,383 TBI 4L60E, 4.10's, Tuned with Tunerpro RT (Where it all began)
It turns out that all my problem was in the tune. Truck is running great now. I ran it with the AC on yesterday and was feeling a little something so I logged it again. I need to work on my decel enleanment tables some more.
-1999 Hugger Orange SS, LS2 402 T56, 9 inch Ford 3.90 gears, Tuned with HP Tuners
-2002 Cavalier, Tuned with HP Tuners
-1994 Full Size Blazer ,383 TBI 4L60E, 4.10's, Tuned with Tunerpro RT (Where it all began)
Hard to have a good tune with all the issues you've fixed? Glad your going the right direction!
I'm sure the billet distributor with melonized gear will be fine. But as far as aftermarket EST/ICM there are huge differences in timing it produces. Sticking with a GM AC unit is by far best choice. Get one that is 369, not 048. Good read:
http://www.thirdgen.org/techboard/di...ncy-table.html
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
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