Hey, I've been trying to figure out my misfire issue with my car for a while no with no luck. I had the hood open today explaining the HPF to someone and while the car was idling i could hear the CDFP, but if i put my head by the valve cover i could hear lots of other ticking that sounded like the valves ticking. it was a separate noise from the fuel pump. It's been making that noise for so long i just assumed it was the fuel pump and normal. I'm asking if any other cars have this much ticking from what sounds like the valves or if you think i need new lifters or rocker arms, and how to tell which. and I remember reading that with roller rockers and springs our cars can rev much higher, and details on this? if i am gonna replace anything in the head i will want to upgrade those parts as well. thanks!

 

I believe the DI injectors also make a small tick when they open/close

 

prolly a cracked roller. Happened to me twice on the same valve, ended up being a bad spring all is better now.

 

Waiting to here back on the dealer but mine is knocking kinda sounds like a horse galloping

 

mine could be an injector i suppose, it seems to be on every cylinder in order, like an injector should be, but i'll have to find another one sometime and listen up.

 

you'd have a bunch of oil all over if the roller cracked .... fyi for ya.

it'll rise and drop with RPMs too.

 

I have had two break. No oil.

 

^^ Ouch! Well, looks like each case is different ..... they all follow the RPMs though, it's noticable if you rev it up at idle.

 

Yea, as long as your exhaust is quite enough lol

 

ha i agree and my noice is getting worse louder everyday they cant fit my car in until monday o well
[QUOTE=wantedSS/TC;4838696]you'd have a bunch of oil all over if the roller cracked .... fyi for ya.

if you have a bad roller why would there be oil everywhere, well i guess ur right bc oil is evereywhere underneith the valvecover anyways lol ur post just made me giggle

 

yeah, bad roller, not valve cover gasket. I am not really sure what to make of my misfiring. what should i look for if i visually inspect the rocker arms to check for damage?

 

This kind of stuff. You may have to tap the ignition a couple times to get the rollers to roll around. Make sure you turn the key back or it will try and keep starting. I dont know why the hell GM didnt put solid roller in there instead of the **** needle bearings

 

o wow and how many did you break? just one and the rest are just badly heatspotted and warn?

 

Just one the first time. We had ordered all 8 for the exhaust side and 8 lifters, but just that one was bad. Within 2 weeks the same valve had it happen again, changed the spring along with the roller and have had no problem thus far.

 

Were you reving up to 7?

 

7000 rpm red line, shifting at about 6000-6300