no DTC's... interesting.. was this first setup to use MAF?
i know before i converted to SD tuning, if i removed the MAF, but left
the wiring connected (IAT still functional) if get a P0101 or 0102.
do you have a MIL setup? usually also a P1870 FMC error occurs as the
"load" isnt complete so default full force (bang) shift to protect from
slippage. id get a stock no vats tune (leave the DTC's alone) to verify
issues.. and run the DTC's out in batches.
airdeano
1965 C10 5.3L/4L60e (300HP 4-Speed)
http://home.comcast.net/~airdeano/1965/img/196531.jpg
http://home.comcast.net/~airdeano/1965/index.htm
That is exactly Allens plan. 99% only tune for the mods that I have so that it will run, I guess a proven tune file that he knows is good. My mods are pretty mild and common. CAI, shortie headers, cam,spring p rods & shift kit / stall converter to match.Originally Posted by airdeano
The ony time I ever got a bang shift or code was when the vss wire got pinched.
That was also interesting, because without the vss input that truck had so much more power, LOTTS more. It wound up pretty tight shifted hard (bang)
into third and stayed there. no down shift no tc lock. Shut it off....start back in first... repeat.
You could leave a stop in third gear no problem. But the increase in power off the stop in first gear was dramatic and also in third. I fixed it asap, but always wondered why it was so strong only then.. and not always... obviously it was/is capable.
so ???? no vss signal.. truck has more power????
and???No maf signal.. truck has WAY more power. (its gonna break the seat mounts) starts better, idles smoother.WTF I dont understand how its running at all.
I"m guessing that the file that is in the pcm now is junk or at least way way wrong for my truck. And the truck is a lot stronger than I thought. I can not imagine how great its gonna be when its tuned right. This bi polar electronic stuff has got to go.
I drove it with this tune for 18k miles and no issues till the other day, My buddy drove a brand new company pickup with a 5.3 , I let him use my truck to move and he could not believe how much better mine ran than the one he drove for months, he's a gearhead so he knows. Wait till i tell him my rig's been running like shit since i put it on the road.
Any new news on your shifting problems? I'm running into the same thing w/ my swap. Shifts fine at normal but WOT the truck just red lines and won't shift. I'm getting the p1870 code though. Just wondering if your new tune fixed it?
98 GMC ext cab, 02 LS1, Nelson Tune, S&P headers, cutouts, underdrive pulleys, LS6 intake w/ 85 mm intake, 6/7 drop, 20x10 MB wheels, shift kit w/ servo, 3.42 rear w/ true-trac
Last edited by RedHeartbeat; 08-20-2007 at 08:39 AM.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Red,
I've done the normal search for the code but I think I remember reading somewhere that the code can be kicked by a tune that's not right on the money. I could be wrong..... It's just something I read. New news on the truck though, I went for a drive today and now the trucks dead on the side of the road. It was driving fine down the highway and then nothing. Park works and every other gear is like neutral. At 1st look it's like the trans pump went out, like there's no pressure in the valve body. Now I'm wondering if a tune can be out far enough to kill a trans? I guess I'll be pulling that apart this week. Good thing I have vacation time saved!
98 GMC ext cab, 02 LS1, Nelson Tune, S&P headers, cutouts, underdrive pulleys, LS6 intake w/ 85 mm intake, 6/7 drop, 20x10 MB wheels, shift kit w/ servo, 3.42 rear w/ true-trac
I don't know about the tune crapping the transmission out. The first indication was you have a bad valve body. It could have killed the transmission. How many miles did you have on the transmission?
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Several things have happened, I got my new tune from Nelson Performance and that did not solve the shifting problem , the truck performs better, pulls very hard, bit will not shift properly, Different Maf minimal change and new problem.
At a normal driving part throttle (no let up) It will only shift out of first at well over 4000 by it self.
It will shift to second sooner if I let off the gas.
It seems to shift 2-3 & 3-4 a bit high rpm but reasonable , much better if i let of the gas , drive it like a stick shift.
Down shifts back to first at 20mph.
Wot from a stop- good launch, pulls hard, red lines, bounces off the rev limiter no shift till I let off the gas - some times right to 3rd
Wot from the speed limit - down shift to first , pulls crazy hard till redline, no shift.
Definitely not slipping.
Running, starting, idling, cruising, all better & pulling harder with new tune
I spoke with Allen and he said to substitute a KNOWN good MAF and try that.
I BOUGHT ONE FROM A BONE YARD (bc i couldnt find a donor) not a KNOWN good one. and I still have most of the same problems, and a new one.
Hard to start. but the 2-3 3-4 shift is much better. that was today 8-23
So IDK WTF. other than my wallet is 50 lighter.
Keep in mind that I had ZERO problems with this truck ((other than only minimal performance gains based on the mods I have)) till I unpluged the MAF.
I thought and correctly that the truck should have more umph. Per opinion of other person, I unplugged the MAF, for a diagnostic check. Based on the results, They also said leave it un-pluged. The truck really came to life, had fun for that day and now just A$$ ache.
and you never got a P0101 MAF code or IAT code either...
did you do the brake/horn (clear the KAMS) thing?
what is this vehicle?
you need some data scanning... see what the sensors are saying to the
computer. some sensor is saying something wrong and at the inappropriate
time. do you have autotap or HPTuners?
airdeano
1965 C10 5.3L/4L60e (300HP 4-Speed)
http://home.comcast.net/~airdeano/1965/img/196531.jpg
http://home.comcast.net/~airdeano/1965/index.htm
Custom car custom probelms. I dont think its the tune, But rather a mechanical problem and suggest your either take it in for a proper daig or find a donor tranny and see if it fixes it:p I know you didnt have any issues before unpluging the MAF, But its just a coincidence IMO. Your not always going to get a code and if you do dont read too far into them. There a good diag aid, but can be miss leading to the untrained eye or in certain situations and sometimes there just not there. Also go slap the dude around who told you to just leave the MAF unpluged permanently for a fix
No codes have showed up with this situation at all , from 2/3 weeks ago when I first un-plugged the MAF, thru miles of erratic shifting, 3 resets and battery disconnects over night, New computer Nelson tuned , swapped MAF, NONE!
I DONT UNDERRRRRRRRRRSTAND.
When the brake horn KAMS thing came up I responded with a question if that was only applicable to oem complete vehicles with bcm and other systems still intact or for swapped trucks also. I got no further input and since my vehicle is a swap i did not do the KAMS.
The truck is a 88 k-5 blazer 4x4 with a 2004 5.3/4l60e 212/218 cam, springs push rods, shortie headers, oem cats, dual 2.5 pipes, CAI, efans 180 t stat, trans go shift kit, TCI 2600 stall all Now Nelson performance Tunned.
I do not have a scanner or tunning software, and beyond my control
I am now flat broke can't get it or have it done for at least a month. But i got a new tune.I am ecstatic about the tune , but I should have got it scanned first.
The truck only set codes 5 times (since i got the bugs out) in the last 18k+ trouble free miles, I forget the # s and know its important but 1) tranny stuck in third, corrected itself when I restarted the truck happened twice about a week apart, that was at one month on the road,and not broken long enough to fix it. 2) vss wire got pinched , fixed wire. 3) lean bank one & 4) lean bank 2- both at the same time. fuel pump in tank connection.
I'm starting to wonder about, not necessarily a coincidence, or caused directly by, but related to the drastic performance increase when I unplugged the MAF, and That one time trany hic-up a long time ago.
I wonder if some thing is/was wrong/ loose/ stuck and waiting to change any way?
If I understand all of the input that I have gotten, ...... feel free to Jump in and stop me if this is not so.......
A certain tuner someone not on this site took the info and input I gave them concerning the performance of my truck. What I told them was this:
"I Think my tune is not quite right, I want to see about getting it changed"
He asked me "what I wanted him to change, as if I would know exactly what it needed or which table was off.
"IDK this info but I can tell you the basics of the problems"
"My truck runs much better before it fully warms up.... it feels stronger, shifts tighter, just all around better" then some more details on that subject. I also told them about "how much more power the truck had when the VSS signal was lost. but that was only from ignition start to the 1-2 shift point. and repeated after shutting the truck off" then some more details.
His diagnostic little mind was looking for or suspected something (what IDK) and he knew disconnecting the MAF would tell my motor it was -40 and pcm would adjust accordingly. and go into a closed loop. HE Told me to discon the MAF and call back with results. It felt as if the truck found at least 60 horse power. I said "much better"
He said any codes? NO CODES shifting ok shifts WONDERFUL, PERFECT he said leave it unpluged and drive it What I dont need it ? Well it could make the tran.......but.........no you said its shifting ok yea shifting good Ok leave it unplugged and let me know what you want me to change BTW he has not returned my calls
IDK what was off but the closed loop obviously ran better especially with the mods I have. He also knew it would do something not good with the transmission but never finished the word or the sentence or explained the possible/potential problem or what it might do or how it would act.
pure speculation and assimilation of gathered info on my part ............
The closed loop function, and the Increase in line pressure, a few really fncking cool WOT shifts, gobs of torque, for a few miles have dislodged/jammed, plugged up, or completely has broken something. That one time long ago tranny hic-up may be involved. But what or how or even if IDK
Any thoughts ?
Thanks guys your all I've got.
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