problems after 5.3 install in 98z28 need help!
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problems after 5.3 install in 98z28 need help!
I just installed a 5.3 shortblock out of a 04 Tahoe with milled. 040 98 ls1 heads into my 98z28. I also installed a ls6 cam. Put motor in and it will not run. It cranks and cranks. Like its out of time. I have good fuel pressure,injector pulse and spark. I'm stumped any ideas? All help and advice is greatly appropriated.
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I got mad and left the shop before I got a chance to pull a plug but they were brand new and put them in when motor was out. Don't think I have coils backwards since its an 98 and they mount individually to valvecover. And yes the 5.3 I have does have the rear cam sensor.
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No factory tune. I've seen on the board many guys that run a 5.3 on factory tune. I could understand it not running well but id think it'd start. I've installed huge cams n ported heads and had them run on a factory tune.
#13
Did you unhook the harness from the coils at all? If so it might be your problem, if you unhook all four coils from the harness your able to turn it around and it hooks up the same, but on the 98s the wires on the harness has to go to a certain coil... when you get back to the shop check the wires with the diagram above and see if it matches up.. you get what I'm saying?
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I installed a 3.5L in a Montana that originally had a 3.4L and it would'nt start . It ended up being the lifters somehow were too full of oil or something like that because the valves were staying just a few thous open . So I pushed on the rockers by hand to open each valve 1 by 1 and after a cpl times doing that They closed and it started and ran a little rough 4 a few minutes eventually returning to normal . Something I had never seen or heard of before