LT1-LT4 Modifications 1993-97 Gen II Small Block V8

intake backfire?

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Old Jun 25, 2005 | 01:53 AM
  #1  
VanbibberLt1's Avatar
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Default intake backfire?

alright im getting backfire through the intake manifold. im leaning on it being the rocker arms being to tight and throwing off the timing for the valves.

my question is this. if its not this would i have a burnt/bad valve somewhere? im hoping its just the rocker arms. but i have a feeling it isnt those.
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Old Jun 25, 2005 | 05:54 AM
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maybe opti going out, when it goes it it will sometimes throw timing all over
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Old Jun 26, 2005 | 10:21 PM
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if its not that what else could it be?
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Old Jun 27, 2005 | 04:28 AM
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I have the same problem and heres a list of things that can cause it...
Ignition:icm,wires,plugs,opti,coil
Mechanical:Bent valve,improperly adjusted valves(rockers),timing chain a tooth off.
Lean condition(fuel psi)
Hope this helps a little what mods do u have how new are parts listed above?
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Old Jun 27, 2005 | 10:43 AM
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My friend had a big backfire through the intake when we were puttin his headers in, because he put the wires back on the opti in the wrong order.
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