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01-28-2009, 10:10 AM
| #1 |
| Junior Member Join Date: Jan 2009
Posts: 6
 |  1996 vortec 305 to a 350 I need help!! I swapped my vortec 305 to a crate gm vortec 350, out of a 1996 silverado 1500 4x4. Replaced the fuel injectors but that is it. Everything else I just bolted back up. Now I have been hearing that I need to replace the ecu. But the truck will run fine after a few minutes. At first the truck falls on its face but seems to come out of it after a minute or two and then runs great. Any help would greatly appreciated. |
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01-28-2009, 12:03 PM
| #2 |
| Senior Member Join Date: Sep 2008 Location: Southern MN
Posts: 113
| I'm thinking that the two motors have different timing and a/f ratios. So, after those couple of minutes the ECU might be doing adjustments to run better. You really should get a ECU for that motor. They're probably only $70 and if you get a custom tune they sometimes sell replacement ECUs. So for $300 you could get the correct ECU and a better performing motor. -Mike Welcome to the site!
__________________ 96' Silverado Z71 04' Honda VTX 1300 S |
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01-28-2009, 12:36 PM
| #3 |
| Senior Member  Join Date: Dec 2007 Location: Grande Prairie, AB
Posts: 2,206
 | just go to the dealer and get it flashed, or better yet get a custom ecm tune. best money ever spent. guarenteed to work. |
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01-28-2009, 03:58 PM
| #4 |
| Senior Member  Join Date: Oct 2008 Location: orland park ill.
Posts: 143
| mikes probably right on the af ratios and a custom tune would work great but if you want to do it your self theres a pretty big variety of hand held tuners out there |
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01-31-2009, 07:38 PM
| #5 |
| Full Member Join Date: Jun 2008
Posts: 46
| look up nelsonpreformance.com . They seemed to be the best deal that i found and im doing the same thing you just did. just taking me some time to get my stuff together lol |
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02-03-2009, 07:34 PM
| #6 |
| Junior Member Join Date: Jan 2009
Posts: 6
| Hey thanks for the info. Can anyone tell me where to get it flashed? Called my local dealer and they said they could and when I took it there they said that they could not. So I am stuck. Thanks again. |
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02-03-2009, 07:57 PM
| #7 |
| Senior Member Join Date: Oct 2008 Location: orland park ill.
Posts: 143
| autozone does it for free... or at least around here they do, give it a shot |
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