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Old 11-09-2013, 07:07 PM
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Question backfiring through the intake

hi i have a 94 chevy Astro van awd 4.3 v6 and its backfiring through the intake only when you start going up hills is the only time is does it. I changed the spark plugs, wires, cap,rotor, and coil. check engine light is not on. any suggestions
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Old 11-10-2013, 12:19 PM
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Only thing I can think is that the injectors are leaking in the intake manifold. Or timing is way off.
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Old 11-11-2013, 07:08 PM
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Default backfiring through the intake

Thanks. I will check it. what would also cause the Exhaust to get cheery red with no cat or muffler on it. Only on the passenger side. 94 chevy Astro van awd 4.3 v6

Last edited by tommyboy8072002; 11-11-2013 at 07:26 PM.
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Old 11-11-2013, 09:50 PM
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Over fueling I'd say.
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Old 11-12-2013, 07:13 AM
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k. Thanks.
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Old 01-06-2014, 01:01 AM
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Default backfiring

HI,There is a TSB about the ignition module that will cause backfiring we
replaced it on my sons 94 s10 and that problem went away,now we are trying to bucking from i believe fuel starvation,but there is not a schrader valve on this year truck to check fuel pressure with a gauge.
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