Engine sputtering under acceleration

[epix]

To begin with, I rebuilt my engine last summer/fall and only got about 10 miles on the engine before it went into storage back in early november. I got it out of storage today and noticed while driving it would sputter under acceleration of any sort.

The engine and other parts consist of: forged pistons/rods, l35 heads, 412 cam, 50lb injectors, walbro 255, pte63e turbo, a2a, 3000 stall, ultimate chip (programmed for 50lb, 412 cam, and Vortec heads).

Also under medium acceleration, there is more sputtering and I can see exhaust smoke out the tail pipe that is dark grey in color.

I'll hook up datamaster tomorrow and see if there is any knock. Anything else I should look for?

 

[kentuc]

Re: Engine sputtering under acceleration

Old gas

 

[epix]

Re: Engine sputtering under acceleration

Old gas

if thats the case i only have less than 1/4 tank left, ill try to burn it up tomorrow and refill it with some 93 octane

 

[SY2932]

Re: Engine sputtering under acceleration

I say fuel or ignition in that order. If you have a means for checking your fuel pressure when you are accelerating, that will tell you right away if you see that the fuel pressure is dropping. It should rise 1 psi per pound of boost. On my truck, ignition issues don't manifest themselves until I get into full boost with misfires. But as we all know, every truck is different. Also, if the Ultimate chip is a new addition make sure that it is PROPERLY SEATED and that none of the pins are bent/broken. It is VERY easy to do if you aren't careful.

With reagrds to old gas, my truck sat for over two years transmissionless and I was able to get into stock boost with no problems whatsoever. I didn't beat on my truck while I had the old gas in there. I carefully rolled into boost a few times just to check out the old gas=bad gas claim and I wasn't convinced. I didn't use any of those fuel stabilizers or whatnot either. However, I did completely fill the tank so that that would minimize condensation build up in the tank.

 

[jwaller]

Re: Engine sputtering under acceleration

vac line or something of the sort with ignition

 

[12secondSY]

Re: Engine sputtering under acceleration

With reagrds to old gas, my truck sat for over two years transmissionless and I was able to get into stock boost with no problems whatsoever. I didn't beat on my truck while I had the old gas in there. I carefully rolled into boost a few times just to check out the old gas=bad gas claim and I wasn't convinced. I didn't use any of those fuel stabilizers or whatnot either. However, I did completely fill the tank so that that would minimize condensation build up in the tank.

Mine sat for a year and with the old gas it wouldnt even start. It had less than 1/4 tank when I parked it. Put in $5 and it fired right up. Probably depends on location, where you store it, etc. Mine was stored in a parking lot with a cover over it through an Illinois summer and winter