Need help with my new 72 long bed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jrdz2120 · 04-17-2008, 05:18 AM

I just got a 72 the other day. I ran it about a year and a half ago in my 2000 silverado 5.3 and was neck and neck. My problem is I picked it up cheap running bad. From what I can tell it has a 350, long tube headers, edelbrock performer intake and 750 carb, hei and 700r4. It idles smooth and revs smooth in park, but when in gear it struggles and misses. So far I have installed fresh plugs, wires ,cap, rotor,coil, and fuel filter. What I have found wrong is header collector leak, 12v wire from battery to alt. is melted and ignition switch if jiggled cuts out sometimes and not sure if carb is bad or was swapped out. any help or input will be great. Thanks.

streetstar · 04-17-2008, 07:35 AM

welcome to the board ! post a pic when you can

Thats a tough predicament -- it can just feel like you're throwing money at it after awhile

Hopefully someone will chime in
but in the meantime ---- ttt

chevychase · 04-17-2008, 07:41 AM

Have you checked the timing?

matthufham · 04-17-2008, 03:05 PM

how's the choke?

jrdz2120 · 04-17-2008, 04:02 PM

It has a manual choke that is not connected and I will check the timming, but not sure of where it is sipposed to be at.

jrdz2120 · 04-20-2008, 01:55 AM

Ok, so I have changed plugs, wires, cap, rotor coil,fuel pump,and fuel filter.
I checked the timming and it was at 12btc@600 rpm. I set it at 4btc @ 600 rpm and It just started banging out worse. I also re-wired power leads from battery and fuse box to dist. soldered connections and changed ignition switch.

All that is left is carb and dist. itself. Any input please? Thanks.

49m · 04-20-2008, 04:40 AM

My camaro did that and it had a cracked head.

jrdz2120 · 04-20-2008, 05:22 AM

Do you think so? There is no smoke, overheating , waterleaks and the oil is clean. Thanks.

jhow66 · 04-20-2008, 05:23 AM

12*BTDS with hose off and plugged?

jrdz2120 · 04-20-2008, 05:29 AM

Do you think so? There is no smoke, overheating , waterleaks and the oil is clean, but it just misses in gear. Thanks.

jrdz2120 · 04-20-2008, 05:50 AM

Yes, it was 12*btds with the advance hose disconnected and plugged, but I set it to 4*btdc and started sputtering worse. It feels like an ignition problem, but everything has been changed except the module and dist and carb. Help.

tim21391 · 04-20-2008, 05:53 AM

did u say you changed your points?? or is it hei... my truck was up on the highway and i was runnin about 75 or 80 and then all of a sudden i lost power and couldnt go faster then 45 but when i rev in neutral i had all power there..and it missed on takeoff alot too..so i fixed my points and it was fine

jrdz2120 · 04-20-2008, 06:00 AM

I'm sorry, I have a HEI in the truck.

tim21391 · 04-20-2008, 06:24 AM

ok my mistake im sorry

69long"n"low · 04-20-2008, 06:48 AM

i was having problems like that before to check yor sparkplugs set timing to 8 degrees and make sure that choke is open all the way if your not using it oh ya and make sure that none of the sparkplug wires are touching anything metal

jhow66 · 04-20-2008, 07:35 AM

5 & 7 crossed? Broke plug (outside)?

jrdz2120 · 04-22-2008, 01:50 AM

Well, I got the truck running today and I still have problems. I changed the dist. out and the number 7 plug was cracked. I set the timming at 8 deg.,idle at 600 and test drove it and It ran like a bat out of hell for about 15 minutes now It feels weak , but doesn't bangout any more. The header gasket at the number 4/6 exhaust ports blew out. Could that cause the problem? HELP PLEASE. Thanks.

jhow66 · 04-22-2008, 02:00 AM

No. Dist. moved? (loose)

jrdz2120 · 04-22-2008, 02:48 AM

I checked the timming and it is still@8deg. btc. Do you think all that heat dumping on the #6/4 plugs could cause it to run weak?

jhow66 · 04-22-2008, 06:29 AM

Quote:

Originally Posted by jrdz2120

I checked the timming and it is still@8deg. btc. Do you think all that heat dumping on the #6/4 plugs could cause it to run weak?

Decribe "weak".

jrdz2120 · 04-22-2008, 06:38 PM

The truck went from tire smoking instant throttle to running, but not strong as mentioned before in a span of 15/20 minutes.

jhow66 · 04-22-2008, 08:19 PM

Check gas filter-try it with gas cap off (vacuum in tank)

jrdz2120 · 04-22-2008, 08:53 PM

I'll give that a try .I'll also change the gasket at the header and give it another once over.Thanks,

jrdz2120 · 04-23-2008, 03:59 PM

Had a fouled plug #8. Rund ok ,but now kind of boggs from dead stop launch.
Maybe cap/ rotor fouled?

jhow66 · 04-23-2008, 07:10 PM

You need to take it to a buddy that knows carbs. Sounds like a carb adjustment problem. Cap and rotor don,t just "foul".

04-17-2008, 05:18 AM	#1
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Need help with my new 72 long bed I just got a 72 the other day. I ran it about a year and a half ago in my 2000 silverado 5.3 and was neck and neck. My problem is I picked it up cheap running bad. From what I can tell it has a 350, long tube headers, edelbrock performer intake and 750 carb, hei and 700r4. It idles smooth and revs smooth in park, but when in gear it struggles and misses. So far I have installed fresh plugs, wires ,cap, rotor,coil, and fuel filter. What I have found wrong is header collector leak, 12v wire from battery to alt. is melted and ignition switch if jiggled cuts out sometimes and not sure if carb is bad or was swapped out. any help or input will be great. Thanks.

04-17-2008, 07:35 AM	#2
streetstar Registered User Join Date: May 2007 Location: Moore, Oklahoma Posts: 2,396	Re: Need help with my new 72 long bed welcome to the board ! post a pic when you can Thats a tough predicament -- it can just feel like you're throwing money at it after awhile Hopefully someone will chime in but in the meantime ---- ttt __________________ Are you retired too? Nonsense! I'm in my prime

04-17-2008, 07:41 AM	#3
chevychase Registered User Join Date: Jun 2007 Location: Boca Raton, FL Posts: 476	Re: Need help with my new 72 long bed Have you checked the timing? __________________ Joe

04-17-2008, 03:05 PM	#4
matthufham Registered User Join Date: Feb 2005 Location: Carl Junction, Missouri Posts: 2,061	Re: Need help with my new 72 long bed how's the choke?

04-17-2008, 04:02 PM	#5
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Re: Need help with my new 72 long bed It has a manual choke that is not connected and I will check the timming, but not sure of where it is sipposed to be at.

04-20-2008, 01:55 AM	#6
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Re: Need help with my new 72 long bed Ok, so I have changed plugs, wires, cap, rotor coil,fuel pump,and fuel filter. I checked the timming and it was at 12btc@600 rpm. I set it at 4btc @ 600 rpm and It just started banging out worse. I also re-wired power leads from battery and fuse box to dist. soldered connections and changed ignition switch. All that is left is carb and dist. itself. Any input please? Thanks.

04-20-2008, 04:40 AM	#7
49m Registered User Join Date: Aug 2007 Location: Turners Station,Ky Posts: 842	Re: Need help with my new 72 long bed My camaro did that and it had a cracked head. __________________ My Rides 1969 Mustang gt coupe 1971 Chevy Cheyenne 1986 Iroc camaro 1986 K10 Short Bed 1987 Iroc Camaro 1990 rs Camaro 1992 350 ss truck 1998 Honda Civic 2005 Ram 2500 Cummins My Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=279831

04-20-2008, 05:22 AM	#8
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Re: Need help with my new 72 long bed Do you think so? There is no smoke, overheating , waterleaks and the oil is clean. Thanks.

04-20-2008, 05:23 AM	#9
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Need help with my new 72 long bed 12*BTDS with hose off and plugged? __________________ 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

04-20-2008, 05:29 AM	#10
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Re: Need help with my new 72 long bed Do you think so? There is no smoke, overheating , waterleaks and the oil is clean, but it just misses in gear. Thanks.

04-20-2008, 05:50 AM	#11
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Re: Need help with my new 72 long bed Yes, it was 12btds with the advance hose disconnected and plugged, but I set it to 4btdc and started sputtering worse. It feels like an ignition problem, but everything has been changed except the module and dist and carb. Help.

04-20-2008, 05:53 AM	#12
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: Need help with my new 72 long bed did u say you changed your points?? or is it hei... my truck was up on the highway and i was runnin about 75 or 80 and then all of a sudden i lost power and couldnt go faster then 45 but when i rev in neutral i had all power there..and it missed on takeoff alot too..so i fixed my points and it was fine __________________ 1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796

04-20-2008, 06:00 AM	#13
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Re: Need help with my new 72 long bed I'm sorry, I have a HEI in the truck.

04-20-2008, 06:24 AM	#14
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: Need help with my new 72 long bed ok my mistake im sorry __________________ 1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796

04-20-2008, 06:48 AM	#15
69long"n"low Registered User Join Date: Jan 2008 Location: SURREY BC, CANADA Posts: 278	Re: Need help with my new 72 long bed i was having problems like that before to check yor sparkplugs set timing to 8 degrees and make sure that choke is open all the way if your not using it oh ya and make sure that none of the sparkplug wires are touching anything metal



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04-20-2008, 07:35 AM	#16
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Need help with my new 72 long bed 5 & 7 crossed? Broke plug (outside)? __________________ 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

04-22-2008, 01:50 AM	#17
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Re: Need help with my new 72 long bed Well, I got the truck running today and I still have problems. I changed the dist. out and the number 7 plug was cracked. I set the timming at 8 deg.,idle at 600 and test drove it and It ran like a bat out of hell for about 15 minutes now It feels weak , but doesn't bangout any more. The header gasket at the number 4/6 exhaust ports blew out. Could that cause the problem? HELP PLEASE. Thanks.

04-22-2008, 02:00 AM	#18
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Need help with my new 72 long bed No. Dist. moved? (loose) __________________ 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

04-22-2008, 02:48 AM	#19
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Re: Need help with my new 72 long bed I checked the timming and it is still@8deg. btc. Do you think all that heat dumping on the #6/4 plugs could cause it to run weak?

04-22-2008, 06:38 PM	#21
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Re: Need help with my new 72 long bed The truck went from tire smoking instant throttle to running, but not strong as mentioned before in a span of 15/20 minutes.

04-22-2008, 08:19 PM	#22
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Need help with my new 72 long bed Check gas filter-try it with gas cap off (vacuum in tank) __________________ 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

04-22-2008, 08:53 PM	#23
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Re: Need help with my new 72 long bed I'll give that a try .I'll also change the gasket at the header and give it another once over.Thanks,

04-23-2008, 03:59 PM	#24
jrdz2120 Registered User Join Date: Apr 2008 Location: dallas,tx Posts: 46	Re: Need help with my new 72 long bed Had a fouled plug #8. Rund ok ,but now kind of boggs from dead stop launch. Maybe cap/ rotor fouled?

04-23-2008, 07:10 PM	#25
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Need help with my new 72 long bed You need to take it to a buddy that knows carbs. Sounds like a carb adjustment problem. Cap and rotor don,t just "foul". __________________ 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

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