Unstable idle and stalling???
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Joined: Apr 2000
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From: Nutley, NJ, USA
Unstable idle and stalling???
OK, guys. When I installed my new coil in my 1986 LG4 equipped Firebird, the distributor twisted, so the timing was all off. It was knocking. Anyhow, my dad and I did the timing yesterday, set to 6* BTDC with the four wire cable disconnected (can't remember what it's called right now) and now the thing idles like crap. It'll surge then fall back down, ranging 250 RPM above and below where the idle was set before (650-700). It also stalls if I leave it in drive at a light, and sometimes when I leave it in park.
Could it still be a timing issue? Or did something go bad here coincidentally?
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1986 Firebird, LG4 305, bored .040 over, Crane cam, Edelbrock headers, Hooker Aerochamber muffler, loud and fast.
"Gimme fuel, gimme fire, gimme that which I desire!" - Metallica, "Fuel"
Could it still be a timing issue? Or did something go bad here coincidentally?
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1986 Firebird, LG4 305, bored .040 over, Crane cam, Edelbrock headers, Hooker Aerochamber muffler, loud and fast.
"Gimme fuel, gimme fire, gimme that which I desire!" - Metallica, "Fuel"
Thread Starter
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Joined: Apr 2000
Posts: 312
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From: Nutley, NJ, USA
Anybody? Vader? GMTech? Please. 
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1986 Firebird, LG4 305, bored .040 over, Crane cam, Edelbrock headers, Hooker Aerochamber muffler, loud and fast.
"Gimme fuel, gimme fire, gimme that which I desire!" - Metallica, "Fuel"
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1986 Firebird, LG4 305, bored .040 over, Crane cam, Edelbrock headers, Hooker Aerochamber muffler, loud and fast.
"Gimme fuel, gimme fire, gimme that which I desire!" - Metallica, "Fuel"
Thread Starter
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Joined: Apr 2000
Posts: 312
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From: Nutley, NJ, USA
I'm running a QuadraJet.
Nope, idle screw is fine. I've been adjusting it. No matter where I set it, it has the same range until I have it idling over 1000RPM.
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1986 Firebird, LG4 305, bored .040 over, Crane cam, Edelbrock headers, Hooker Aerochamber muffler, loud and fast.
"Gimme fuel, gimme fire, gimme that which I desire!" - Metallica, "Fuel"
Nope, idle screw is fine. I've been adjusting it. No matter where I set it, it has the same range until I have it idling over 1000RPM.
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1986 Firebird, LG4 305, bored .040 over, Crane cam, Edelbrock headers, Hooker Aerochamber muffler, loud and fast.
"Gimme fuel, gimme fire, gimme that which I desire!" - Metallica, "Fuel"
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Try advancing the timing a couple more degrees, maybe 8 or 10. Maybe check the idle mixture too.
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1984 Silver Z28, 383 cid 4 bolt, ARP Fasteners, 2 1/2" Cowl Induction Hood, 600 cfm Performer Carburetor, Torker II Intake, Performer RPM Heads, XE268H Cam, Magnum Roller Tip Rockers, MSD6AL Ignition, Blaster2 Coil, Recurved HEI Distributor, 700R4, TransGo SK, 2.73:1 Limited Slip Dana 44, Terminator Headers, Custom 3" TIG Welded Stainless Exhaust, Flowmaster Muffler, 4 Wheel Disc Brakes, Oil Cooler
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1984 Silver Z28, 383 cid 4 bolt, ARP Fasteners, 2 1/2" Cowl Induction Hood, 600 cfm Performer Carburetor, Torker II Intake, Performer RPM Heads, XE268H Cam, Magnum Roller Tip Rockers, MSD6AL Ignition, Blaster2 Coil, Recurved HEI Distributor, 700R4, TransGo SK, 2.73:1 Limited Slip Dana 44, Terminator Headers, Custom 3" TIG Welded Stainless Exhaust, Flowmaster Muffler, 4 Wheel Disc Brakes, Oil Cooler
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Originally posted by Apeiron:
Try advancing the timing a couple more degrees, maybe 8 or 10. Maybe check the idle mixture too.
Try advancing the timing a couple more degrees, maybe 8 or 10. Maybe check the idle mixture too.
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MikkoV
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