Misses under hard acceleration. WHY? Ideas?
 

Just did head gasket and studs. After assembly i turned up the tune a little. Jumped on it a bit, got a bop, bop, bop kinda miss. Or maybe its a pop, pop, kinda miss. Idles fine, runs fine under light pedal too. Only misses when I hit it.

Only thing I can think of is valve lash was a little loose (I notice while re-assembling) Figured I adjust valves later after running a while.


Any Ideas?

A look below will show the mods.

my friends 01 did this and he had all new valves and valve springs done and has never had a problem since, his truck also had 210k on it, so I don't know:humm:

Def could be some float going on. Why would you wait to adjust them?! Good way to screw a motor up...

you were in there anyway man ya should've at least checked them. preventative maintenance. This'll teach ya. it's much better than killin a motor but next time take your time and check everything

How is the LPG working for you?

Got 250,000 miles on it.
 

The LPG is lame. about 40 hp around town. I never use it while racing, nitrous IS the way to go. 300 hp instead. LPG was a waste of money. But I keep it. Now putting methonol injection on. After I fix valve miss, if thats what it is.


That job was a pain in the ass. had to pull off both turbos, 2nd CP3, Exhaust manifold bolts are killers to get to.

---AutoMerged DoublePost---

I assume the gasket I pull off was factory. The new gasket I put on was OEM cummins. Maybe new gasket was a few thousandths fatter, giving me more lash.

It was a 5 layer gasket that cummins uses. I dont know. I'll try adj valves first. I had an idea they were a little loose when I re-assembled. BUT LIke I said, its an easy adj, compared to R&R head gasket.

What can I say, $ was an issue, I joined the other 10% of america, unemployed due to the oil spill in the GULF. Drill-Ban.

It was an injector issue. 2 bad ones. Probaly 1 then, then continued use fried another.
Don't use RAIL plug! Keep the modified relief valve installed.

Rail plugs are for diagnoses only lol

Typical with a Smarty on the 555's. Start playing with the tunes and timing to find one that will work well.