dk05

Well I got the motor finished today, and I got to hear it run . Only real problem is that it is backfiring through the intake, which I believe is from having too much fuel. I went from a 305 to a 350 and changed the 19lb 305 injectors with some 24.9lb LT1 injectors that I got from Formula a while back. I still have the computer set for a stock 305. Are there any other causes of intake backfiring that could be possible? This is the first motor I have swapped, and I pretty much have been winging it. I am happy to hear it running anyways. I might post some videos once I get it back on the road.

Genopsyde

get a L98 ECM, it just might do the trick.

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1986 Fiero
1990 300ZX TT
1991 Camaro RS 355
1998 Tahoe 4x4
1999 F355 Spyder

kahjdh

backfiring through the intake is usally a timing thing. But i work on carbs not fi so i dunno.

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2001 Chevy Silverado 1500 Z71 5.3L
1996 Acura Integra LS B18 1.8L
*New $50 1996 Lumina APV, blown head gaskets, hope the heads aren't cracked.
*heads cracked, found that heads off a 00' 3.1L malibu work great.
Past Cars:
1990 Buick Estate Wagon 5.0L
1987 Chevy S10 2.5L Tec Four
1995 Pontiac Grand Am 2.3 Quad 4
1996 Jeep Grand Cherokee Limited 5.2L AWD
1991 Ford Tempo L 2.3L
1992 Buick LeSabre 3.8L
1997 Buick Century 3.1L

dk05

Like what, too much adance, or too much retard? What I mean is, does it usually backfire with too much advence or too much retard one the timing?

wrightz28

i think your problem lies in the injectors at the moment. I think the highest you could go on a 305 was 22 lbs. I'm basing this on the assumtiion that the ECm is the '85 POS.

dk05

Well, I figured it out this morning. It turns out it was not getting enough fuel. I cranked up the fuel pressure, and wow what a difference. I even got it to idle on it's own. I am so happy that it is running!!!