Need help with 96 lt1
07-12-2009, 02:09 PM
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Need help with 96 lt1 I have a 96 it starts but back fires some at idle and real bad under load. I thought it was opti replaced that 3 times no differance also replaced coil, icm, plugs wires, opti connecter, iac, and have tried adjusting the rockers but is still doing it. Could it be i am just not adjusting the rockers right? Any tips or help will be greatly appriciated
07-12-2009, 09:47 PM
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Instead of throwing parts at it, which it looks has cost you alot allready, you need to either find someone who has some type of diagnostic scanner, or test equipment or pay someone, cause you will not find you problem at the rate you are going. Could still be quite alot of things. Do you have a SES light on? Any stored codes? These are things you need to find out. Even finding out if there are any codes could be a good start. Autozone will scan you codes for you and tell you what they are for free, unless I believe you are in Cali. I would start here and get the data and see what it is telling you.
hth
andy schuck
hth
andy schuck
07-13-2009, 07:58 AM
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the only codes it is throwing is rear o2 the tech 2 showed the sensors i replaced being alittle low on voltage that is why the were replaced. ive even went as far as ripping it back apart to check that im not a tooth off on the timing set and that the dowle is the right length. thanks all input please keep it coming.
Last edited by LT-1 SS; 07-13-2009 at 12:00 PM.
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07-13-2009, 11:58 AM
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Yes all wiring is good i even checked the group of grounds that are spliced togather in the harness next to #5 and #7 injectors that was good also replaced the opti pig tail. When i started the build i installed a new sending unit as well as a walbro 255 just rechecked pressure it is at 45psi. the front 02's are showing low voltage could that cause it on a cold start up
