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What Causes After Fire ?

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  #1  
Old 09-30-2010 | 09:12 PM
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Default What Causes After Fire ?
My Truck is having some afterfire in the top of second gear. If I am just cruisin in town and the truck doesn't quite **** to 3rd but stays in the top of 2nd for any amount of time it begins to sound like a semi automatic rifle. If I get right on the fuel it doesn't do it and if i'm in the lower rpms it's fine. What could cause this and what is a recommended fix? The truck has a rebuilt transmission , new plugs , wires and new exhaust with longtubes. It only seemed to start doing this after the trans build if that makes any sense . Thanks in advance guys.
 
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Old 09-30-2010 | 09:13 PM
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Possible O2 sensor failing?

How many miles on the truck?
 
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Old 10-01-2010 | 07:03 AM
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Brand new O2 sensor .
 
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Old 10-01-2010 | 12:03 PM
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At what RPM is this happening?
 
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Old 10-01-2010 | 02:12 PM
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I guess I'm stupid! But , what the hell is after fire? We talking about pinging or the rev limiter?
 
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Old 10-01-2010 | 02:13 PM
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Originally Posted by Pacmanloads
My Truck is having some afterfire in the top of second gear. If I am just cruisin in town and the truck doesn't quite **** to 3rd but stays in the top of 2nd for any amount of time it begins to sound like a semi automatic rifle. If I get right on the fuel it doesn't do it and if i'm in the lower rpms it's fine. What could cause this and what is a recommended fix? The truck has a rebuilt transmission , new plugs , wires and new exhaust with longtubes. It only seemed to start doing this after the trans build if that makes any sense . Thanks in advance guys.
It does make sense. Could be a pinched crank sensor wire or it got hit installing the new tranny if it wasnt removed prior. Just a thought.
 
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Old 10-01-2010 | 02:19 PM
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Originally Posted by zman17
I guess I'm stupid! But , what the hell is after fire? We talking about pinging or the rev limiter?
I don't know too.
 
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Old 10-01-2010 | 02:39 PM
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Originally Posted by charlie1935
I don't know too.
http://en.wikipedia.org/wiki/Back-fire

Typically a small engine term. Motorcycles,lawn mowers ect.
 
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Old 10-01-2010 | 02:50 PM
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Originally Posted by Boomer1275
http://en.wikipedia.org/wiki/Back-fire

Typically a small engine term. Motorcycles,lawn mowers ect.
A for effort, but, NOT!
 
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Old 10-01-2010 | 02:59 PM
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Originally Posted by zman17
A for effort, but, NOT!
Not for what please explain.
 
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