Backfire - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DanoDMano · 12-03-2003, 09:43 PM

I recently finished my motor and after installing my throttle rod and kickdown cable I now backfire or cut out completly when I accelerate.

I no longer have timing marks on my timing cover with the new one, so I am kinda goofing with the distributor to get it runnable. I am taking it to a tune-up and Dyno shop tomorrow, but am wondering if I will make it there. About 10 miles of freeway..

It ran pretty good before I messed with the cables today. Could I have messed something up? Could I just have dirty fuel and clogged the filter??

Help!!!!

**old Rusty C10** · 12-03-2003, 10:27 PM

could just be a bad set of points or the condensor and thats a $7 fix

DanoDMano · 12-04-2003, 01:21 AM

No points, HEI!!

Rooster's 67 · 12-04-2003, 02:34 AM

you are getting a back fire only after the trottle rod and tv cable installation, or did it do this before? when you say back fire is it actually spitting flame out of the carb throat or is it an after burn or popping in the exhaust? what is recently finished the motor? last night or last month, could be many things depending on the type of "back fire"

DanoDMano · 12-04-2003, 03:07 AM

It sounds like an after burn or popping in the exhaust. No it didnt do it before, but the only other thing I did was adjust the idle on the carb.
I think it is the distributor timing, but i guess I'll find out tomorrow..

Thanks for the help, I'll let you know what they say at the tune-up.

DanoDMano · 12-04-2003, 04:32 PM

Well I got the truck running like a champ. The Dyno shop found the cnter pin on the Cap was stuck up, barely making contact. He also found that I Had a bad module in the HEI, which I bought off the parts board.

I'm not complaining though, what should I expect for $35!!!

Anyway it Dyno'd at 300HP, and lobes nicely at an idle.

Thanks for all the help, and for getting me through my engine refresh.

**old Rusty C10** · 12-04-2003, 04:36 PM

well glad you got it right at any rate! i forgot to say cap before i had that on the 86 HEI my rotor was messed up too and it backfired

12-03-2003, 09:43 PM	#1
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	Backfire I recently finished my motor and after installing my throttle rod and kickdown cable I now backfire or cut out completly when I accelerate. I no longer have timing marks on my timing cover with the new one, so I am kinda goofing with the distributor to get it runnable. I am taking it to a tune-up and Dyno shop tomorrow, but am wondering if I will make it there. About 10 miles of freeway.. It ran pretty good before I messed with the cables today. Could I have messed something up? Could I just have dirty fuel and clogged the filter?? Help!!!! __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

12-03-2003, 10:27 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,326	could just be a bad set of points or the condensor and thats a $7 fix __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

12-04-2003, 01:21 AM	#3
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	No points, HEI!! __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

12-04-2003, 02:34 AM	#4
Rooster's 67 Registered User Join Date: Sep 2003 Location: DFW Posts: 765	you are getting a back fire only after the trottle rod and tv cable installation, or did it do this before? when you say back fire is it actually spitting flame out of the carb throat or is it an after burn or popping in the exhaust? what is recently finished the motor? last night or last month, could be many things depending on the type of "back fire" __________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

12-04-2003, 03:07 AM	#5
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	It sounds like an after burn or popping in the exhaust. No it didnt do it before, but the only other thing I did was adjust the idle on the carb. I think it is the distributor timing, but i guess I'll find out tomorrow.. Thanks for the help, I'll let you know what they say at the tune-up. __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

12-04-2003, 04:32 PM	#6
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	Well I got the truck running like a champ. The Dyno shop found the cnter pin on the Cap was stuck up, barely making contact. He also found that I Had a bad module in the HEI, which I bought off the parts board. I'm not complaining though, what should I expect for $35!!! Anyway it Dyno'd at 300HP, and lobes nicely at an idle. Thanks for all the help, and for getting me through my engine refresh. __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

12-04-2003, 04:36 PM	#7
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,326	well glad you got it right at any rate! i forgot to say cap before i had that on the 86 HEI my rotor was messed up too and it backfired __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!



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