91ls1silverado

I have a LS1 rebuilt with cam and its in my 91 c1500. I put about 3 feet of piping after the headers so i won't mess up the o2 sensors. Well i drive it around and when i barely step on the gas it like stutters and it sounds weak until i lay the hammer down and it runs good, i thought it was misfiring but nope the scanner reads everything good..all the spark plug wires are on good and oil pressure is good....it does say that the fuel trim learn is disabled...idk what that means can anyone help its starting to be a pain in the butt...and it doesn't smoke neither...pleaae help

91ls1silverado

Also has a mail order tune with refurbished computer

Darkman

iTrader: (2)

First guess is that the tune needs work. How big is the cam? Is this a manual or automatic (what stall?)?

91ls1silverado

Its a 227/235 613/620 on a 110 lsa and its standard..

Old Geezer

iTrader: (3)

Try the diagnostic/tune forum.
Data log[s], and a posting of the tune would also be a good start.

KRAZY K 2000 TA

iTrader: (5)

needs tune plain and simple,PCM section would gain more help

91ls1silverado

Thanks guys, and i was thinking it was something internal but idk...it was just rebuilt and no metal shavings have been found and oil pressure is good....so it could possibky be the tune??

91ls1silverado

So i got the computer back with a better tune, i put new injector o rings on and it still sputters when I'm barely tapping the gas, but when i rev it or give it hell it acts great? What can it be? I thought the tune would help but nope....after driving it for 30 min non stop it works great

DREAMZ28

iTrader: (1)

Did you have it dyno/street tuned?

Darkman

iTrader: (2)

Just to clarify, the sputtering at low throttle settings goes away at once everything is warmed up?

91ls1silverado

Mail order tune....and yes i warm it up for 10 minutes and take it for a drive and after 20-30 min of driving the sputtering goes away and drives fine...and after I turn it off for about 10 min, i start it up again and it runs good for the 1st 30seconds and it starts to sputter...

Darkman

iTrader: (2)

I recently eliminated a similar, temperature related idle problem by cleaning the MAF with CRC MAF cleaner. Since problem started long after a very good tune, I was reasonably sure it was not tune related, so your case may be completely different.

91ls1silverado

This guy told me that my restart fuel enrichment parameter is not right....damnn

LS1MCSS

iTrader: (18)

A mail order tune is usually something to get you in the ball park, so you can drive it to a tuner. Get it tuned correctly and it will probably run right.

91ls1silverado

Yea I'm gonna get it dyno tuned hopefully in a month..til then she gonna sit in the garage and create dust.