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backfiring through the intake


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tommyboy8072002's Avatar
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November 9th, 2013, 7:07 PM   #1  
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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November 10th, 2013, 12:19 PM   #2  
Only thing I can think is that the injectors are leaking in the intake manifold. Or timing is way off.

 
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November 11th, 2013, 7:08 PM   #3  
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; November 11th, 2013 at 7:26 PM.
 
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November 11th, 2013, 9:50 PM   #4  
Over fueling I'd say.

 
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November 12th, 2013, 7:13 AM   #5  
k. Thanks.

 
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January 6th, 2014, 1:01 AM   #6  
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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