Got it crankin but back fires through the carb, timing help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Boise69 · 11-03-2006, 11:43 PM

Someone once sent me the firing order diagram on the 350 and the distributor cap order for the plugs,

when i replaced my HEI with a new HEI i just replaced the cap assembly not the the entire distributor. i moved nothing,

do i have to re-set the timing or did i screw up the wire order on the new cap, its possible because some of the tape fell off and i guessed on where the wire went

but now i'm getting a strong crank from the new mini starter but getting spurting out the carb.

Boise69 · 11-03-2006, 11:49 PM

can anyone send me the firing order on the distributor cap and i'll go from there? thanks

shortbed70 · 11-03-2006, 11:51 PM

Sounds to me like you've got a few wires on wrong. Remove the #1 plug and the main power wire to coil and have a friend bump the starter, watching the rotation of the rotor,with your finger over the hole until it blows air past your finger then start on the cap where the rotor tip is pointing to and go 18436572. Leave the bolt for the dist loose so you can turn it to adjust once it fires.

action · 11-03-2006, 11:52 PM

I would say you have all the wires off 1 hole. pull #1 plug and find tdc then see if rotor is on #1.
Jack

Boise69 · 11-03-2006, 11:57 PM

i have an ACCEL HEI, does it make a difference? should i take the ignition cap off or the entire assembly? (3 push in screws) ?hard to see with the wires attached but if this is the way? is there another way?

action · 11-04-2006, 12:03 AM

Once your up on compression #1 (blows finger off) Pull the cap off and rotor should be pointing at #1 or close. If not you can move all the wires or turn dist. untill #1 is at rotor. Double check that your wires are right.I don't remember off hand but Shortbed70's fireing order sounds right.
Jack

krue · 11-04-2006, 12:10 AM

First I would check to make sure the wires are on in the right order. If so then go the TDC route.

jhow66 · 11-04-2006, 12:24 AM

here is how it is wired on the cap:

**VetteVet** · 11-04-2006, 12:29 AM

Krue's right .
All you need to do is line up the timing mark on the balancer with zero on the pointer and see where the rotor is pointing. If you have not pulled the distributor the rotor should be pointing at the front of the engine or the firewall. If it's pointing at the firewall then that is number six and if you rotate the engine one revolution until the marks line up the rotor will point at the front of the engine. This will be number one and you can install the distributor cap and put number one plug wire there and then no. 8 will be next going clockwise, then 4,3,6,5,7,2.

Here's a picture to help. Remember the wires can go anywhere on the cap as long as the rotor points to number one and the wires follow the firing order.

------------------------------------------------------------------------

Sport/Truck · 01-28-2007, 01:44 PM

I did a search for firing order. And found this. I’m wondering is the firing order is different using points on the stock dizzy. The diagram says all v8’s with HEI.
I was going to double check my plug wires and think it’s marked wrong on one of them, but seems way wrong. Please help.
Thanks,
s/t

Sport/Truck · 01-28-2007, 01:50 PM

I guess it's the same, I just checked it and that's what I have marked.

manimal · 01-28-2007, 05:44 PM

Remove all of your wires from the cap(not the plugs).Make a mark on the cap and the body of the dizzy at the terminal in front of the tach and bat hook-ups,this will be #1. Remove cap and number 1 plug and drivers side valve cover.Rotate engine over by hand(5/8 socket and ratchet w/extension).Watch the valves,when the intake valve closes (and before the exhaust valve opens) you will only need to rotate very slowly until #1 piston is TDC,this is the compression stroke,line up the timing marks at 0 deg. Your rotor should be pointing towards the #1 cylinder "area"(refer to the mark on the dizzy should be pointing right at it) I f the rotor is not pointing at your mark then restab the dizzy to line up this mark and the rotor.Install cap,wires 1-8-4-3-6-5-7-2 in a clockwise rotation,reconnect the power wires leave vac. advance disconnected and vac. source plugged. Start engine,set timing and reconnect vac.Make sure you tighten down the dizzy.YOU'RE DONE!

manimal · 01-28-2007, 05:45 PM

OH YEAH-Put your valve cover on!!!!

manimal · 01-30-2007, 09:18 AM

Did you ever get it fired?

Boise69 · 01-30-2007, 09:38 AM

oh yea. it runs well now. i had the plugs wires off by one.

11-03-2006, 11:49 PM	#2
Boise69 The Hammer Man Join Date: Oct 2006 Location: Wilmington, NC Posts: 864	Re: Got it crankin but back fires through the carb, timing help can anyone send me the firing order on the distributor cap and i'll go from there? thanks __________________ Boise69. Bought in Boise ID and its a '69 ___________________________________________ 1969 Chevy C-10 SWB 350/400 - drivable project www.americanhammer.com 2013 MBZ Sprinter customized 2005 MBZ Sprinter Van 2004 Land Rover Discovery 2001 Yamaha Road Star 1997 MBZ E420 1989 Ferrari Mondial T

11-03-2006, 11:51 PM	#3
shortbed70 Registered User Join Date: Mar 2002 Location: Forney TX Posts: 4,512	Re: Got it crankin but back fires through the carb, timing help Sounds to me like you've got a few wires on wrong. Remove the #1 plug and the main power wire to coil and have a friend bump the starter, watching the rotation of the rotor,with your finger over the hole until it blows air past your finger then start on the cap where the rotor tip is pointing to and go 18436572. Leave the bolt for the dist loose so you can turn it to adjust once it fires. __________________ Troy 1965 Chevy Bagged,361 sbc,voodoo cam,1.5 full roller rockers,patriot 185cc vortec heads 2.02-1.60,vortec weiand polished intake,demon carb my truckhttp://67-72chevytrucks.com/vboard/s...d.php?t=332884 Big Red Dog build http://67-72chevytrucks.com/vboard/s...d.php?t=572274

11-03-2006, 11:52 PM	#4
action Active Member Join Date: Dec 2005 Location: Valley Springs, Ca. Posts: 266	Re: Got it crankin but back fires through the carb, timing help I would say you have all the wires off 1 hole. pull #1 plug and find tdc then see if rotor is on #1. Jack

11-03-2006, 11:57 PM	#5
Boise69 The Hammer Man Join Date: Oct 2006 Location: Wilmington, NC Posts: 864	Re: Got it crankin but back fires through the carb, timing help i have an ACCEL HEI, does it make a difference? should i take the ignition cap off or the entire assembly? (3 push in screws) ?hard to see with the wires attached but if this is the way? is there another way? __________________ Boise69. Bought in Boise ID and its a '69 ___________________________________________ 1969 Chevy C-10 SWB 350/400 - drivable project www.americanhammer.com 2013 MBZ Sprinter customized 2005 MBZ Sprinter Van 2004 Land Rover Discovery 2001 Yamaha Road Star 1997 MBZ E420 1989 Ferrari Mondial T

11-04-2006, 12:03 AM	#6
action Active Member Join Date: Dec 2005 Location: Valley Springs, Ca. Posts: 266	Re: Got it crankin but back fires through the carb, timing help Once your up on compression #1 (blows finger off) Pull the cap off and rotor should be pointing at #1 or close. If not you can move all the wires or turn dist. untill #1 is at rotor. Double check that your wires are right.I don't remember off hand but Shortbed70's fireing order sounds right. Jack

11-03-2006, 11:43 PM	#1
Boise69 The Hammer Man Join Date: Oct 2006 Location: Wilmington, NC Posts: 864	Got it crankin but back fires through the carb, timing help Someone once sent me the firing order diagram on the 350 and the distributor cap order for the plugs, when i replaced my HEI with a new HEI i just replaced the cap assembly not the the entire distributor. i moved nothing, do i have to re-set the timing or did i screw up the wire order on the new cap, its possible because some of the tape fell off and i guessed on where the wire went but now i'm getting a strong crank from the new mini starter but getting spurting out the carb. __________________ Boise69. Bought in Boise ID and its a '69 ___________________________________________ 1969 Chevy C-10 SWB 350/400 - drivable project www.americanhammer.com 2013 MBZ Sprinter customized 2005 MBZ Sprinter Van 2004 Land Rover Discovery 2001 Yamaha Road Star 1997 MBZ E420 1989 Ferrari Mondial T

11-04-2006, 12:10 AM	#7
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Re: Got it crankin but back fires through the carb, timing help First I would check to make sure the wires are on in the right order. If so then go the TDC route. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

11-04-2006, 12:24 AM	#8
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Got it crankin but back fires through the carb, timing help here is how it is wired on the cap: Attached Images __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

11-04-2006, 12:29 AM	#9
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,713	Re: Got it crankin but back fires through the carb, timing help Krue's right . All you need to do is line up the timing mark on the balancer with zero on the pointer and see where the rotor is pointing. If you have not pulled the distributor the rotor should be pointing at the front of the engine or the firewall. If it's pointing at the firewall then that is number six and if you rotate the engine one revolution until the marks line up the rotor will point at the front of the engine. This will be number one and you can install the distributor cap and put number one plug wire there and then no. 8 will be next going clockwise, then 4,3,6,5,7,2. Here's a picture to help. Remember the wires can go anywhere on the cap as long as the rotor points to number one and the wires follow the firing order. ------------------------------------------------------------------------ Attached Images __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-28-2007, 01:44 PM	#10
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Got it crankin but back fires through the carb, timing help I did a search for firing order. And found this. I’m wondering is the firing order is different using points on the stock dizzy. The diagram says all v8’s with HEI. I was going to double check my plug wires and think it’s marked wrong on one of them, but seems way wrong. Please help. Thanks, s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

01-28-2007, 01:50 PM	#11
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Got it crankin but back fires through the carb, timing help I guess it's the same, I just checked it and that's what I have marked. __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. Last edited by Sport/Truck; 01-28-2007 at 01:50 PM.

01-28-2007, 05:44 PM	#12
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Got it crankin but back fires through the carb, timing help Remove all of your wires from the cap(not the plugs).Make a mark on the cap and the body of the dizzy at the terminal in front of the tach and bat hook-ups,this will be #1. Remove cap and number 1 plug and drivers side valve cover.Rotate engine over by hand(5/8 socket and ratchet w/extension).Watch the valves,when the intake valve closes (and before the exhaust valve opens) you will only need to rotate very slowly until #1 piston is TDC,this is the compression stroke,line up the timing marks at 0 deg. Your rotor should be pointing towards the #1 cylinder "area"(refer to the mark on the dizzy should be pointing right at it) I f the rotor is not pointing at your mark then restab the dizzy to line up this mark and the rotor.Install cap,wires 1-8-4-3-6-5-7-2 in a clockwise rotation,reconnect the power wires leave vac. advance disconnected and vac. source plugged. Start engine,set timing and reconnect vac.Make sure you tighten down the dizzy.YOU'RE DONE!

01-28-2007, 05:45 PM	#13
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Got it crankin but back fires through the carb, timing help OH YEAH-Put your valve cover on!!!!

01-30-2007, 09:18 AM	#14
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Got it crankin but back fires through the carb, timing help Did you ever get it fired?

01-30-2007, 09:38 AM	#15
Boise69 The Hammer Man Join Date: Oct 2006 Location: Wilmington, NC Posts: 864	Re: Got it crankin but back fires through the carb, timing help oh yea. it runs well now. i had the plugs wires off by one. __________________ Boise69. Bought in Boise ID and its a '69 ___________________________________________ 1969 Chevy C-10 SWB 350/400 - drivable project www.americanhammer.com 2013 MBZ Sprinter customized 2005 MBZ Sprinter Van 2004 Land Rover Discovery 2001 Yamaha Road Star 1997 MBZ E420 1989 Ferrari Mondial T



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