yardd0g24

iTrader: (4)

I got my motor running and I drove it the other day it has a tune for the cam and everything else. It would run well for about 50 yds of driving then start to mis and buck. I've determined the tune is not right for it but now that I have got it back in the driveway, when I start it, it will back fire and its extremely hard to start.. Before I drove it the other day, It would idle and hold an idle and not backfire. Now it will run for the first minute in a half or so backfire once or twice, then die. Could this possibly be an Opti? or something else?

robsquikz28

iTrader: (246)

it can be the opti, maybe a broken plug or plug wire.....make sure all wires are good and check plugs if you d like....run a scanner check for misfires while driving or idling if you have access to one..

the_merv

iTrader: (88)

Back the Rockers off a hair..

yardd0g24

iTrader: (4)

I don't have access to a scanner right now... I've already checked the plug wires..

Yeah I was thinking the rockers thats one thing I haven't checked... could that possibly cause it to even die after it idles?

the_merv

iTrader: (88)

Yup, mine was doing the same, I had them a hair too tight.

yardd0g24

iTrader: (4)

alright well heres a question for ya .. was it hard to start too? like it didn't want to start when you had them a hair too tight..? Also I have a couple questions for you about your LSx swap too but ill PM ya

the_merv

iTrader: (88)

Yea, it would turn over and barely fire. When it did fire it would pop, and then die.

ss.slp.ls1

iTrader: (36)

I just got my car running again after I blew the old motor. CC503, full bolt-ons, and MadTuner tune. The car started up fine, idled fine, but as soon as I got on it it would buck/surge/hesitate....basically it ran like ****! Swapped the opti, no changed, triple checked the wires, nothing. I eventually took off the valve covers and all the rockers were off. I adjusted them using the engine running method and the car runs perfect now!
Don't just back them off, readjust all of them.

yardd0g24

iTrader: (4)

well it never did backfire until I drove it the other day when I fixed a few things... then it started this bullshit. I guess the valves became unadjusted just from me driving it...

the_merv

iTrader: (88)

Na, Lifters pumped up.

Re-adjust them all, but you will find that you will end up backing them off, probably about 1/10 to 1/4 turn each from where they were.

FlamingChicken

iTrader: (2)

mine was similar. used the 1 and 6 method and found a few valves were way too tight. im guessing maybe they were just off the base circle. now i just bring each to tdc and adjust.

ss.slp.ls1

iTrader: (36)

Engine running method is the best.

nik1703

your avatar is ridiculous. and by ridiculous i mean amazing. lol

PNYKLR-TA

iTrader: (1)

^ +1 everytime i see his avatar, i pause for a moment of silence and just admire that beautiful thing. . .