SF 1HOTLS1

iTrader: (24)

wassup fellas, I have a Fuel injected 454 lsx with a 257/266 .646/.646 on a 114+4. I am not 100% sure it is the cams fault so is why im posting this.

My car can pretty much never start up (cold start) by just turning the key. I always have to give it gas like if it were carburated, otherwise if not it will just crank over and die almost instantly.

Also, even after warmed up, when i take it out of park and put it into gear, the rpm's will sort of surge and fluctuate.

Also, it cannot be driven normally sometimes. meaning; i cant just give it gas and go. I sometimes have to slowly and lightly give it gas until it reaches about 1500 rpm before it acts normal. if i dont do this, it will hesitate real bad, then all of a sudden surge up real quick.

if im at a stop light and floor it, it will hesitate real bad before getting up and going. sometimes at a stop light the rpm will drop so low i have to give it gas to keep it alive.

is this common with big cams? it it the tune? or maybe something else. any ideas??

97camaro383

iTrader: (31)

It is a big cam but I'd think tuning would be the issue. I had a small cammed ls1 that did some of the same stuff and it was the tune.

SF 1HOTLS1

iTrader: (24)

Its been through two different tuners already =(

jimmyblue

iTrader: (11)

There's tuners, and there's tuners, and few of them
want to spend the time needed to get cold starts
and idle right - nor would you want to pay shop rates
for the time it takes.

Now, yes, you have to accept some compromises in
drivability as a consequence of "going big". But how
much better it could be, you may never know "by the
hour".

ss performance

iTrader: (17)

Sounds like a tune to me as well.

Can you trailer it to a tuner so they can look at it cold?

SF 1HOTLS1

iTrader: (24)

I actually have a guy who has tuned numerous cars and can come to my house to see cold start. after i get my 4l80 in the car im going to purchase a wideband and have him see what its doing at cold start and light throttle.

SF 1HOTLS1

iTrader: (24)

Someone mentioned you have to swap 2 wires on the ls2 extention harness. The previous owner of this motor said he doesnt recall doing this. would not swapping those 2 wires on the ls2 extension harness have something to do with this?

SF 1HOTLS1

iTrader: (24)

The motor is from LME and was setup to be in a f body. 24x tooth reluctor and all the LS2 stuff like the timing cover and valley cover. But someone mentioned swapping 2 wires on the extention harness