LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Backfiring through intake

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Old 03-25-2006, 04:19 AM
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Backfiring through intake

I just got done installing the hotcam kit and when I started it up it backfired through the intake so I shut it off. I tried starting it again and it won't start.

I am pretty sure a couple of my rockers are adjusted too tight because on a couple of them I adjusted and then felt the pushrod loose so I went and adjusted the again ( which I now realize isn't right).

Is there anything else that would cause backfiring through the intake besides having the rockers too tight?
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Old 03-25-2006, 05:01 AM
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Re: Backfiring through intake

Timing might be off....
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Old 03-25-2006, 05:06 AM
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Re: Backfiring through intake

When I put the timing chain on the cam gear was at 6 and (with the dowel pin in the 3 O'clock position) and the crank gear at 12.
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Old 03-25-2006, 05:17 AM
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Re: Backfiring through intake

Well then the timing sounds fine. Go back and readjust the rockers. Did you follow the tech part of shoebox's website for adjustment of the rockers?
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Old 03-25-2006, 05:38 AM
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Re: Backfiring through intake

Stick a battery charger on it then try to fire. When my battery gets weak it has done this a couple times. Still can't figure out why.
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Old 03-29-2006, 04:43 PM
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Re: Backfiring through intake

Fixed my problem, I readjusted my rockers and it still backfired but through the exhaust. I then checked my plug wires and I had a couple mixed up.

The cam runs pretty good on the stock tune but I can tell there is definately more power left in it. I'm going drive it around a little bit and then look at my fuel trim and knock retard etc. with the Tech 2.
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