BOOSTAT4500

iTrader: (17)

I have a 4l80e behind an LQ4 in a Foxbody mustang. Trans and converter (FTI 3500 stall) are both new. When cruising around on the freeway the converter will only lock up about 25% of the time. It will lock for about 30 seconds to a minute and then unlock for a few minutes. No big changes to throttle or anything, just normal cruising down the road. It doesn't seem to be an issue in lower gears when driving around time. Unless I just don't notice as much. Is there something in the tune possibly or a mechanical issue somewhere? I have HPtuners if there is something I can change.

forcd ind

iTrader: (7)

speed, RPM, throttle position, all go into keeping it locked or unlocked
you may have to tune it-I have only used the Compushift Controllers, and was able to dial in whatever it needed to work
not likely a trans or converter issue, Greg builds a great converter

dreww

iTrader: (1)

a lot of the 4l60 with bigger stall torque convertors have this issue. Mine did as well. its a 4000k stall.

The lights stall throws off the rotational mass of the motor which causes "misfires" but not CEL. Its a tuning issue most likely, as stated above.

BOOSTAT4500

iTrader: (17)

I'm pretty sure I got it fixed. I desensitized the misfire monitors a little and so far so good. Thanks guys.

01ssreda4

iTrader: (96)

Yep misfires. Weird cause some people have the issues, other never have it.

JRENIGAR

iTrader: (37)

I have the same issue with my ss3600. How do you desensitize the misfire monitors? I have hp tuners also.

dreww

iTrader: (1)

engine diagnostics > misfire tab > misfire detection

JRENIGAR

iTrader: (37)

Thanks, I will give it a try. Mine will generally drive about 10-30 miles from cold start at roughly 50-70mph. It will stay locked until I give it like 10%-30% throttle and it unlocks and act like its slipping. I kick it down a gear and it will lock again then no slip at 10% or so throttle and pull strong in od actually lugging the motor if I give it enough to accelerate but not downshift. All will be fine then maybe a couple of miles more it might do it again. I ahd the car dyno tuned with stock converter. I installed the ss3600 and it drove fine for about 5000-6000 miles until I noticed it. I am getting a random misfire code now. When it unlocks I can clear it using hp tuners going down the road and it instantly locks again. Hopefully adjusting the misfire table will fix it.

dreww

iTrader: (1)

it will work. I never got a misfire code on mine, and never noticed these "misfires" it was detecting, but the PCM will pick them up regardless. Just desensitize the misfire settings (I believe I set it to allow for more misfires).

I only adjusted the low and maybe mid RPM tables, the high RPMS I didn't touch.
My theory is as the motor spins faster, it helps "center" everything like swinging a bag full of stuff fast enough that it doesn't fall out. Hence no issues at higher RPMs

JRENIGAR

iTrader: (37)

Are the adjustments self expalnatory as to waht way they need to be adjusted or??? What way should I adjust it? Up in values or down? As you can tell,I havent looked at the tables yet.

dreww

iTrader: (1)

I don't remember, I don't have my laptop with me.

but some cells only allow a couple hundred "misfires" before it affects driveability. Other cells have like over 1,000 counts before it causes issues.

I think I just upped the numbers of the "low" cells up to like 1,000 hits before it affect driveability.