[moremph]

Have a hotshot friend of mine broke down in indiana, truck was running great he came up to a stop let out of it from 65mph and it started making a loud popping noise through the intake? truck seems to be idleing fine but has lost all bottom end power and is making a loud (audiable in the background on crappy cell phones thumping noise coming back through the intake???

any ideas?

turbo?
valvetrain?
pushrod on exhaust valve come loose?

Thanks for the help Travis

 

[69W900A]

Most likely a bent valve. Have had 5 or 6 in the fleet do it now, not common but it does happen with 'em. Usually they'll idle really rough though, but one I had didn't idle too bad, but ran like doodoo.

 

[moremph]

how in the heck would you go about diagnosing that short of pulling a head???

Travis

 

[smorris]

Could be a bent or out of place pushrod. Figure out which side it is coming from and pull the valve cover. Possibly a broken rocker arm too.

 

[Hottapper1]

I had the same problem with my 03 and it was the cam,and they put a new motor
in my truck..

 

[weweld]

I had a truck here with 2 broken rocker arms doing that

 

[Arisley]

Could be a bent or out of place pushrod. Figure out which side it is coming from and pull the valve cover. Possibly a broken rocker arm too.

Burnt intake valve? The valve has to be open on compression stroke to pop through the intake.

 

[smorris]

Yup. I screwed up when I did the valve springs on mine,:doh:. Last one to do -2am, pass. side, very front. Put in the push rod, and it didnt seat in the rocker good. It held the valve open just enough to make it pop. Luckily didnt hurt anything. By 4 am , had it back apart, fixed, put back together, and driving.. Long night . Will not EVER make that mistake again!