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Need help! 84 GN
I purchased car a couple months ago and it was not running, bone stock. I messed with the cam sensor and it started running... Well I knocking off again and order Caspers cam sensor cap with the led light, have it set again and when I try to crank it I get an extremely loud back fire, I'm talking so loud a guy walking down the street dropped and screamed. Any ideas what it could be? It's really bothering me because I only have a couple weeks to enjoy it before I start my new job out of state. Any help would really be appreciated.
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#2
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Re: Need help! 84 GN
I wonder if the cam sensor is set 180 degrees out. Easy to do. Car will run, but will do a lot of weird things like backfires and rough idle.
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Ken Mosher 1987 GN original owner 650+ HP Black 2015 BMW 328xi XDrive wagon 2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold) 2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold) 2014 Silverado LTZ Crew 4WD 2012 Honda VFR 1200F Tahitian Blue (sold) 2015 BMW S1000R Racing Red 2013 Honda CBR500R Red (wife's bike) 2014 Triumph Bonneville T100 2003 Harley Davidson V Rod Anniversary Edition |
#3
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Re: Need help! 84 GN
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, loud back fire. On an 84 are these the correct cylinder #s? 6 5 4 3 2 1 ?? |
#4
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Re: Need help! 84 GN
That is correct.
Do you have the correct wires going to the correct plugs? If not, you could easily get misfires. The plugs fire in pairs across each coil, and one should always be firing during an exhaust stroke, and therefore not ignite anything.
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Scott Keller - GNTTYPE Founder & Moderator
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#5
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Re: Need help! 84 GN
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If you don't mind maybe i can explain Better on the phone I'll message anyone my number that can possibly help me out.
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89 Mustang GT - couple of mods 84 GN - Bone stock |
#6
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Re: Need help! 84 GN
Quick thought: The "numbers" will be displayed upside down on a 86-87 car. Perhaps you have the coil flipped, and thus have every plug in concert wire wrong. Save for the center pair, of course. Even if center two are connected to their opposite across the center coil, it won't matter.
Before you start flipping the coil, be sure that the engine fires #1 in time with the mark on the balancer. Just get a timing light and check it with all the wires connected and someone else cranking. There have been cars where the crank sensor gets damaged from a backfire. And others that have the timing chain jump. A timing light will help tell the real story.
__________________
Scott Keller - GNTTYPE Founder & Moderator
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#7
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Re: Need help! 84 GN
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89 Mustang GT - couple of mods 84 GN - Bone stock |
#8
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Re: Need help! 84 GN
I have it running now, I checked the timing and the timing mark it at 16 degrees. How would I adjust that?
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89 Mustang GT - couple of mods 84 GN - Bone stock |
#9
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Re: Need help! 84 GN
http://www.gnttype.org/techarea/ecms...ensor_FAQ.html
Think you are at the chip's timing map mercy now. Unless the crank reluctor or cam is off from the stock position. If it is running, the cam sensor is either right or 180 degrees off. Incremental changes have more effect on fuel delivery than spark timing. Look at some of the other articles on the topic on the website.
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Scott Keller - GNTTYPE Founder & Moderator
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#10
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Re: Need help! 84 GN
__________________
Scott Keller - GNTTYPE Founder & Moderator
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