This is topic 86 gt back firing in forum Tech Talk at Northern California Ford Owners  .


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Posted by Santos1986gt (Member # 10513) on :
 
When Im coming to a stop" while still in gear" my 86 will start to backfire really bad. Let me be more specific. When I start my car the idle will sometimes go up really high. But when the rpm's go back down really low, between 550-650 that's when it starts to back fire. It started doing this when I added my gt40p with a 75mm tb. Could it be my iac,maf or my timing. LMK thanks.

[ February 01, 2012, 11:34 AM: Message edited by: Santos1986gt ]
 

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Posted by Blind (Member # 3052) on :
 
most likely a bad vacuum leak, check the pvc to start with.
 

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Posted by Santos1986gt (Member # 10513) on :
 
It does this when it gets to operating temp.
 

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Posted by Santos1986gt (Member # 10513) on :
 
It does this when it gets to operating temp.
 

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Posted by LXjames (Member # 10791) on :
 
Maybe retarded timing? Vacuum leak? Try some sea foam maybe carbon sticking valves open and use good gas like techron 89 at least and drive it out
 

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Posted by norcalfiddy (Member # 11207) on :
 
check your firing order/timing.

when i got my car it will do that after the rpms drop when i started it. my firing order was mixed up on cyl. 3 and 4.
 

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Posted by slocobra (Member # 6311) on :
 
Check the map sensor, if it goes bad on a sd car its will run horrible everywhere but wide open.
 

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