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rebuilt lq4 wont start

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Old 10-08-2012, 08:18 PM
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Default rebuilt lq4 wont start
Rebuilt lq4, new bearings and rings. Has spark, fuel, and compression all I get is what sounds like popping in the intake. Tune is stock 6 liter with injector flownrates changed for the marine 8.1s. All grounds are good, battery ground on side of block and ground from harness then 3 on back of motor.

What do you guys think?
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Old 10-08-2012, 09:59 PM
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Tried extra pcm no change. Its like its turning backwards.
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Old 10-08-2012, 10:04 PM
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I've seen someone do this on a engine swap in a 1971 pickup....battery cables connected backwards on battery. No joke
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Old 10-08-2012, 10:21 PM
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They are hooked right visually, I might swap battery's and try it.
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Old 10-08-2012, 10:31 PM
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Timing chain installed correct? Piston at tdc, cam gear and crank gear dots pointing at each other?
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Old 10-08-2012, 10:49 PM
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Its all correct. Pulled the front end apart to double check.
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Old 10-08-2012, 11:02 PM
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Try removing pcv valve hose from the top if intake. Mine wouldn't start with it hooked up after i rebuilt it.
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Old 10-08-2012, 11:14 PM
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Mines hooked to a catchcan.
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Old 10-08-2012, 11:22 PM
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So its not hooked to the top of intake?
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Old 10-09-2012, 02:15 AM
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check the EVAP silonoied (poor spiling ) but you know what I mean
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