MattSapp95_T/A

iTrader: (35)

Can someone tell me what the signs of a wiped cam lobe are?

can it cause a high rpm miss?

I did a bunch of searching and didn't come up with any real solid answers..



Thanks
Matt

Badazz 97 TA

iTrader: (18)

uhhh yeah. im sure it would miss all over the place. not just high rpms.

jaycenk

iTrader: (1)

Very low power through the entire rpm range as well.

Low N Slow

iTrader: (4)

I had an older SBC that had two flattened cam lobes and the only real sign was a rough idle. It passed emissions testing and ran fine except for at idle. A vacuum waveform test was how I was lead to the cam having flat lobes.

fleetmgr

You can also pull the valve covers. Rockers that don't move as much as the rest (if at all) will tell you.

GREGG 97Z

iTrader: (4)

I overreved mine one too many times with the old lt4 springs, it knocked the lifter retainer plate of the #1 cylinder. I drove it for another 20 minutes before the 2 lifters got stuck sideways and started grinding down the lobes. It started screatching pretty awful that's when I shut it off. Didn't destroy the lobes just ground into them enough that the cam wasn't worth fixing.

MattSapp95_T/A

iTrader: (35)

Mine drive fine and idles fine with no popping or back firing...the only prob I have is at high rpms it starts missing and popping... 5800+

Car still went 11.90s shifting at 5700...

i just wanted to see if a worn cam lobe can cause that kind of problem...

I just did a valve adjustment and all of the rockers looked to be moving good...

Badazz 97 TA

iTrader: (18)

hate to be the one to blame it since i dont like to since its more reliable then people make it out to be, but opti?

robsquikz28

iTrader: (246)

I will say that you either have a valvetrain issue or your opti is FUKD up. My bros car had went through 3 different optis last year on the dyno, what a fukn waste of time and it sucked badly. Then finally installed another partsladi opti and the problem went away and the car was perfect. Just like yours it would break up at 5k rpm, the 4th one fixed the problem.......OPtimus prime my friend.

MattSapp95_T/A

iTrader: (35)

Just installed

Patriot extreme gold Dual springs shimmed to 1.800
No bent push rods and the length is great
1.6 pro mag roller rockers
and 1/4 preload past zero lash


I have been through 3 All Ignition optis, 2 Ac delco optis and now I have a Dynaspark....I am pretty sure it is not the opti...

New coil
New ICM
New Plugs
New Wires

I don't know I am about to set it on fire!

robsquikz28

iTrader: (246)

Your setup seems good I have no idea why this would happen to you. But you still never know it might be a bad opti, I would try and borrow someone elses KNOWn GOOD opti on here and try it out.

joelster

Scan it during a full throttle run. Does it trip a check engine light at high rpm? This sucks man. I thought the valvesprings were surely the issue.

fergymoto

iTrader: (129)

It's not lean up top is it? That can cause breaking up and popping if it is that lean.

MattSapp95_T/A

iTrader: (35)

I am going to scan it but I have to get a OBD2 style connectors for data logging... its the dumb year OBD2 connector with OBD1 pcm....Well I took it for a ride today and when it starts missing it throws a check engine light and then it dosent want to idle...turn the car off and then back on and the light is gone and it idles great...


No it never goes lean at all just starts popping and acting crazy but it will still pull to the shift light at 6400....

Here is a dyno and a pic of the motor in case anyone sees anything I am missing...

old93camaro

iTrader: (8)

Unplug your d6 box and try a run, dynaspark says not to run one it there unit..just saying. Oh yea another thing are you dropping volts as this is happen could be a problem as well....I'm just throwing stuff out there

MattSapp95_T/A

iTrader: (35)

yea I have tried running it with and without the D6 box... I will try it again though now that I have the Dynaspark on....

I will check voltage too....Check gauges is never on though...

hitmanws6

iTrader: (20)

Maybe a fuel problem? My friends was doing this and he had a leaky headgasket. And my friends LS was doing this as well and he had gotten some water in his injectors when he pressure washed his motor

MattSapp95_T/A

iTrader: (35)

I don't see it being fuel though when the A/F was in the 12s for the entire pull... even when it fell off

MattSapp95_T/A

iTrader: (35)

hmmm...maybe a leaky head gasket.... The compression check was good though

gregrob

iTrader: (8)

Have you checked the opti harness