Truck Missed Shift and Rev Limiter

pa-powerstroke · Aug 25, 2013

So on my way home from work yesterday I was rolling at about 10mph, I landed on it and launched and kept it pegged. Well the truck never shifted or hit the rev limiter until I let off which I hope wasnt too late. It acted like it was stuck in gear or something and I had it pegged until it sputtered like it was going to shut off. When that happened I glanced at the rpms and the were at 5k:doh:. First of all why did this happen? Could it be a tranny issue? Ive done the same thing before and never had that problem. Second of all what could racking my motor out to 5k have done? How much damage was likely?

pa-powerstroke · Aug 25, 2013

Anybody?

Vinny07psd · Aug 25, 2013

Definite tranny issue, any issues since?

ghohouston · Aug 25, 2013

turbo could be leaking oil and casued it to run away on the oil... as far as the shifting goes, i would guess a tuning or trans issue

yeehaw · Aug 25, 2013

mine did that one time racing a cummins, banged 4600 and i let out. I've put 15k since then and it's never done it again. No other motor issues either.

Mdub707 · Aug 26, 2013

Tuning? Who's? I had this happen numerous times running tunes from one vendor.

6.0 p-stroke · Aug 26, 2013

When I hit 5k I blew the check ball out of the hpop and had some valve to piston contact. Nothing too major. Other times when I've bounced off the rev limiter I can usually let out a bit, let it shift, then hammer down again. I've been through a few transmissions though lol. You'll probably be ok if you don't do that too often, I'd talk to your tuner about it, maybe he has a solution.

Jarrod B · Aug 26, 2013

6.0 p-stroke said:
When I hit 5k I blew the check ball out of the hpop and had some valve to piston contact. Nothing too major. Other times when I've bounced off the rev limiter I can usually let out a bit, let it shift, then hammer down again. I've been through a few transmissions though lol. You'll probably be ok if you don't do that too often, I'd talk to your tuner about it, maybe he has a solution.

and i thought hitting 4500 rpms on mine was high..........

6.0 p-stroke · Aug 26, 2013

It's only happened once, I was spooling it pretty hard, let off the brake, the tires broke loose for a split second then the truck died after a lot of popping and loud noises lol. Normally when I hit the rev limiter it's around 46-4700 rpms.

jdgleason · Aug 26, 2013

ghohouston said:
turbo could be leaking oil and casued it to run away on the oil... as far as the shifting goes, i would guess a tuning or trans issue

What?

Sounds like the trans flared. Clutches are probably getting burnt up. Talk to your tuner like stated above and I'd do a trans service to check health of the trans.

pa-powerstroke · Aug 26, 2013

Well I guess a big part of the problem is that I still have canned SCT tunes....:fustrate:
Thats the first time that has ever happened though, and I havent had any issues before or since. I do have more 3-5 shift flare than when I had lower miles, If Im going to replace solenoids should I have the trans flushed before or after? And will that along with better tunes prolong tranny life?

SEABEE08FX4 · Aug 26, 2013

Hard to say without looking at it, but most likely its transmission slippage.

ghohouston · Aug 26, 2013

jdgleason said:
What?

Sounds like the trans flared. Clutches are probably getting burnt up. Talk to your tuner like stated above and I'd do a trans service to check health of the trans.

Never seen a diesel run away???

Josh@DirtyDiesels · Aug 26, 2013

This has happened to me once or twice. Usually from putting it to the floor from a roll, it seems like it starts to spool then tries to downshift and the trans gets confused... I usually let off as soon as it happens, engine hits the limiter and sputters a few times, and then just coast until everything figures out what it is doing and then off you go all good again.

jdgleason · Aug 26, 2013

ghohouston said:
Never seen a diesel run away???

For 2 seconds between a shift? Never.

ghohouston · Aug 26, 2013

jdgleason said:
For 2 seconds between a shift? Never.

Ill admit I was wrong for posting that, I didnt read what happened carefully enough. I went back and saw the truck shut off. Ive had a 6.0 run away once on me while running a contribution test, it was scary!

Jarrod B · Aug 26, 2013

lol my 7.3 ran away while being tuned in park.

i think your clutches are effed if you already have a flair.

SEABEE08FX4 · Aug 26, 2013

You probably have a little bit of this going on.

http://i143.photobucket.com/albums/r131/brandydela/imagejpeg_1_zps64de01d8.jpg?t=1377553799

jdgleason · Aug 26, 2013

ghohouston said:
Ill admit I was wrong for posting that, I didnt read what happened carefully enough. I went back and saw the truck shut off. Ive had a 6.0 run away once on me while running a contribution test, it was scary!

I was making sure we were on the sale page lol.

A buddy of mine was messing with the pump on his 12 valve dodge and it started to run away. He had the presence of mind to put it in 5th and dump the clutch lol

Scary stuff when they do run away.

ghohouston · Aug 26, 2013

Thats my plan if my tdi jetta ever runs away, well if im driving that is, dont care how fast or slow im going, its getting dumped in 5th and brakes locked up. Ive personally seen an old v8 n/a cummins and that 6.0 run away. The 6.0 had an intercooler full of oil, and a blown egr cooler, so it filled our shop with white smoke, we all had to clear out for 10 minutes or so, it was so smoky we didnt try to get the truck shut off. The cummins is another story, we have a fleet of g.I.'s (duece and a halfs whatever you want to call them) and a guy at work pulled a fuel tank, and blocked the return off, so technically, it didnt run away, but basically did the same thing. There were about 10 of us runming around tearing up boxes and cutting mudflaps frantically to block the intake off. That n/a cummins had a 5" straight pipe too, so we couldnt hear each other screaming at each other, it was crazy.