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Author
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Topic: 86 gt back firing
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Santos1986gt
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Member # 10513
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posted
 
 
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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86gt minor upgrades(under construction)
2012 Focus SE (racing chip)?
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Xgotsome4me4
Posts: 271 | From: East Palo alto | Registered: Dec 2010
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Blind
2.3L
CAFords OG
Member # 3052
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posted
most likely a bad vacuum leak, check the pvc to start with.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Santos1986gt
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Member # 10513
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posted
It does this when it gets to operating temp.
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86gt minor upgrades(under construction)
2012 Focus SE (racing chip)?
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Xgotsome4me4
Posts: 271 | From: East Palo alto | Registered: Dec 2010
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Santos1986gt
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Member # 10513
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posted
It does this when it gets to operating temp.
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86gt minor upgrades(under construction)
2012 Focus SE (racing chip)?
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Xgotsome4me4
Posts: 271 | From: East Palo alto | Registered: Dec 2010
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LXjames
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Member # 10791
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posted
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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On Point Motorsport prez.
King Lx
Posts: 4761 | From: Pittsburg CA | Registered: Mar 2011
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norcalfiddy
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Member # 11207
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posted
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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600HP 1996 7.3L powerstroke single cab short bed race truck
Posts: 3393 | From: Brentwood | Registered: Aug 2011
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American Iron Speed Shop
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Member # 6311
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posted
Check the map sensor, if it goes bad on a sd car its will run horrible everywhere but wide open.
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AmericanIronSpeedShop.com
Posts: 435 | From: Loomis Ca (sacramento) | Registered: Dec 2005
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