krexken

I recently installed a Comp 212/218 .488/495 on 112 and Hooker Comp headers and exhaust with 2 1/4 cats and Magnaflows. Sounds okay. Cam is hardly noticeable at idle. It's died a couple of times when put in gear but that's been rare. Full throttle performance is less than stellar but not too bad. Definitely shifting way too soon. I never drove the truck until after cam install(not my truck). It has a light miss at light cruise rpm only. Never misses under load. Code said random misfire or something to that effect but I can't find a reason why it would misfire. New plugs and wires and cap looks good. I plugged EGR port in intake manifold. Not sure what affect that has on anything. Pretty sure owners gonna let me send the computer off for a tune but I don't think that has anything to do with the miss. Any tips from the pros? Or amateurs? Truck is a 96 Chebby, auto. Thanks

86MC_SS

iTrader: (3)

Where the valve guides trimmed for he extra lift? If not, they have to be trimmed. Also if they were not trimmed check your push rods. I bet some are bent.

budhayes3

iTrader: (19)

Actually the PCM might be adjusting for decreased vacuum and other characteristics of the larger camshaft, creating the part throttle performance issues. The misfire code may be a false code caused by the larger cam. Of course, recheck all the mechanicals first, and definitely get the PCM tuned to compensate for the new cam.

mds2004

Did you get +.50 locks and retainers? If not max you can handle is .480 instead of the .530 with them. Is your truck tuned for the cam? Yes with my 218/224 .570/.565 113LSA cam you cant notice it in my 383.

krexken

Yes I installed the +.o50 locks along with beehive springs. It'll actually pop a bit when I put it in 3rd gear manuallly and hold it around 65mph or 2000rpm or so. It has the stock tune.

litreddevil

iTrader: (4)

you may want to check with a scn tool witch cyc is missing i bet either a bad wire are bad plug

mds2004

Call Allen Nelson for a dyno tune.

krexken

Changed plugs and wires. Same problem. Also rechecked lifter preload. No problems there. Plugs were all on the dark side for sure. Do you think a tune will solve my problems?

BLACKND

iTrader: (5)

I'd be willing to bet that the tune will help out your situation.

trever1t

iTrader: (14)

You put a cam (with narrow LSA) and exhaust without tuning for them, I'm not really surprised its running odd!

Get that to a reputable dyno tuner and I'll be surprised if your not surprised in how much better it runs!