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04-23-2015, 12:11 AM
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#26 | |
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18 Till I Die
Join Date: Mar 2005
Location: Alberta, Canada
Posts: 1,522
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Re: freshly rebuilt sbc will not start
Quote:
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2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home... 
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04-23-2015, 02:13 PM
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#27 |
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Registered User
 
Join Date: Dec 2013
Location: Omaha NE
Posts: 620
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Re: freshly rebuilt sbc will not start
Can't just leave us hangin' ! JP any luck?
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04-23-2015, 04:10 PM
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#28 | |
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Registered User
Join Date: Apr 2013
Location: Northern MN
Posts: 63
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Re: freshly rebuilt sbc will not start
Quote:
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1941 Chevy Cabover- Future carhauler build 1949 Chevy Pickup 1955 Chevy Pickup 1959 Apache fleetside 1965 Chevy Pickup- Current Ground up Build 1972 Gmc Pickup- Getting rebuilt engine and 700r4 |
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04-23-2015, 05:26 PM
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#29 |
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Registered User
Join Date: Feb 2009
Location: Adkins Texas
Posts: 157
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Re: freshly rebuilt sbc will not start
Did you replace the distributor cap and rotor? I just installed an engine that was running fine before I took it out. I also tried everything, seemed like the timing was off and just couldn't figure it out. Installed new cap and rotor and started right up. Just a thought and an easy thing to try.
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Never a failure, Always a lesson! 1968 Chevy SWB Fleetside ECE 4/6 327/350 1987 Chevy V20 Scottsdale 4X4 350/400 4.10 1987 Chevy Custom Deluxe SWB 305/7004R4 1991 Suburban Silverado V1500 4X4 350/700R4 2015 Chevy Crew Cab SWB (Daily Driver) 5.3 |
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04-23-2015, 05:45 PM
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#30 |
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Registered User
Join Date: Feb 2011
Location: Modesto, CA
Posts: 2,189
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Re: freshly rebuilt sbc will not start
I see you're getting a wealth of knowledge but diagnosing it really isn't nearly as complicated as it's made out to be. Unless i'm mistaken, you have verified you have spark, fuel, and obviously air. Do you have compression? Start from scratch. If you are dead certain your on TDC, is your harmonic balancer new, or used? If it's used, it could have slipped on the rubber making your timing incorrect. Silly mistakes can happen when people get complacent.
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04-23-2015, 06:15 PM
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#31 |
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Registered User
Join Date: May 2014
Location: Auburn
Posts: 145
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Re: freshly rebuilt sbc will not start
I'm very curious as to what is it..If the Mechanical timing is correct I would start at the Power lead to the Dizzy..it could be a bad Module too..A million things it could be
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04-23-2015, 07:47 PM
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#32 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,971
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Re: freshly rebuilt sbc will not start
Using the 40+ year old harmonic balancer? The outer ring can slip on the hub when the rubber between the inertia ring and the hub gets old and starts to disintegrate. If this happens your mark on the balancer will be off from TDC on the timing tab.
Also... careful not to keep cranking it over and over and over if it a flat tappet cam... Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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04-24-2015, 12:21 PM
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#33 |
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Registered User
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: freshly rebuilt sbc will not start
Wouldn't it be funky if the distributor cap was one of the Accel "corrected" caps? Like this one Corrected Distributor Cap
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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04-24-2015, 12:48 PM
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#34 | |
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Registered User
Join Date: Feb 2011
Location: Modesto, CA
Posts: 2,189
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Re: freshly rebuilt sbc will not start
Quote:
 since those came out I was wondering what havoc that would bring if wired traditionally!
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04-24-2015, 03:54 PM
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#35 |
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Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: freshly rebuilt sbc will not start
I think the "spark" essential element is missing. I would start considering BOOB parts. Happened to me when I rebuilt a Corvair. I replaced every ignition component with new parts and could not get the engine to start. Turned out to be a bad coil (or was it condenser...can't remember). Point is, just because it is new does not mean it is good.
BOOB = Bad Out Of Box. |
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04-24-2015, 04:27 PM
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#36 |
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Registered User
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: freshly rebuilt sbc will not start
I have also had a bad tach kill an ignition on a points distributor. This one is HEI that owner says it does have spark. Whether the spark happens at the right time and in the right sequence is another question.
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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04-24-2015, 04:46 PM
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#37 | |
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Registered User
Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
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Re: freshly rebuilt sbc will not start
Quote:
Perhaps a friend has one (currently working?) that you could substitute in for a 15 minute test. ....just thinking out loud here, but its perhaps time to get back to basics. All good Coley 
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....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500 |
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04-24-2015, 05:11 PM
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#38 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: freshly rebuilt sbc will not start
Start over and don't guess. Find TDC properly. Align the rotor tab with the cap. Set initial timing. Check fuel pressure during cranking to ensure it's not blowing past the needle and seat and flooding it. Put an inline spark check tool (five bucks) inline to verify you're actually getting spark.
It's kinda hard to help when someone says they KNOW everything is right but it doesn't run, after all... My entire frameoff fired on the first revolution not because I'm so smart, but because I'm so afraid of mistakes.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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04-24-2015, 05:25 PM
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#39 |
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The oddest Todd around
Join Date: May 2004
Location: Miami, Florida
Posts: 1,418
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Re: freshly rebuilt sbc will not start
Stupid question, but how do you know the timing is set correctly if the engine hasn't been fired up?
Kinda hard to set the timing perfectly with the engine not running...
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"The greatest pleasure is to vanquish your enemies and chase them before you, to rob them of their wealth and see those dear to them bathed in tears, to ride their horses and clasp to your bosom their wives and daughters." Ghengis Khan IIOY??? |
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04-24-2015, 05:28 PM
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#40 | |
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The oddest Todd around
Join Date: May 2004
Location: Miami, Florida
Posts: 1,418
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Re: freshly rebuilt sbc will not start
Quote:
Why do the numbers go weird on the wired do you think? 1,3,7,5 on one side and 8,4,2,6 on the other. Figured it would at least be 1,3,5,7 and 2,4,6,8...
__________________
"The greatest pleasure is to vanquish your enemies and chase them before you, to rob them of their wealth and see those dear to them bathed in tears, to ride their horses and clasp to your bosom their wives and daughters." Ghengis Khan IIOY??? |
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04-24-2015, 05:42 PM
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#41 |
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Registered User
Join Date: Apr 2015
Location: Barnesville PA
Posts: 16
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Re: freshly rebuilt sbc will not start
Start over. Pull all of the spark plugs, and valve cover over #1 cylinder. Turn engine over by hand, watching the valves open and close on #1 cyl. Put your finger over the #1 spark plug hole. You should feel compression pushing your finger out on compression stroke. When the intake valve closes, you will be very close to TDC. Pull the dizzy cap, and see if the rotor is pointed at #1. If not, pull the dizzy and reset.
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04-25-2015, 02:07 PM
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#42 |
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Registered User
Join Date: Apr 2015
Location: Barnesville PA
Posts: 16
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Re: freshly rebuilt sbc will not start
Any luck JP?
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04-25-2015, 03:05 PM
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#43 |
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Registered User
Join Date: Dec 2009
Location: Atlanta, Ga.
Posts: 1,050
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Re: freshly rebuilt sbc will not start
Inquiring minds need to know? Hope your out riding around?
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I don't think we get smarter as we get older. We just run out of Stupid things to do. |
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04-25-2015, 07:41 PM
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#44 |
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Registered User
Join Date: Mar 2012
Location: Boulder, CO
Posts: 350
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Re: freshly rebuilt sbc will not start
Make certain you're at #1 TDC, and set up the wires accordingly. Also, inspect the balancer carefully- it can be the source of much misery. Just went through this on the '72 Cheyenne BB. The HEI was easy, the nasty damper was annoying- I could get it to start and run by messing with the distributor, but the timing wouldn't stay consistent. The balance fell apart when I dropped it on the pavement.
Posted via Mobile Device |
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04-25-2015, 09:26 PM
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#45 |
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Registered User
Join Date: Dec 2014
Location: Supply,N.C.
Posts: 59
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Re: freshly rebuilt sbc will not start
Had same problem, mine was no. 2 chevytruckluver, I was almost sure I had it correct , but when putting the cap on and button pointing right , when I was sluding it in place it turn a little and I did not notice it , upon rechecking I saw it wasn't pointing to No.1 , Make sure it points after it down . My guess here is the problem.
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05-04-2015, 03:33 PM
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#46 |
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Registered User
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: freshly rebuilt sbc will not start
You get that thing running yet JP?
__________________
1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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05-05-2015, 11:29 AM
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#47 |
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Registered User
Join Date: Dec 2009
Location: Atlanta, Ga.
Posts: 1,050
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Re: freshly rebuilt sbc will not start
Still wondering and hoping he out riding around?
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I don't think we get smarter as we get older. We just run out of Stupid things to do. |
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05-05-2015, 03:24 PM
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#48 |
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Registered User
Join Date: Jul 2001
Location: Reno, Nv.
Posts: 70
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Re: freshly rebuilt sbc will not start
I fought a similar problem last summer with a new engine. Checked everything mentioned above at least twice. My problem was the valves needed to be adjusted a little bit looser on start up. Once running, readjusted valves and ran great. Drove me crazy for over a month.
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05-05-2015, 06:06 PM
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#49 |
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Registered User
Join Date: Jan 2015
Location: Ventura, CA
Posts: 818
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Re: freshly rebuilt sbc will not start
I'm hoping you will come back and tell us she's up and running. I hate problems like this.
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..................... ____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1970 C20 -_--_--_- ______ _--_--_- /___|__\____ -_--_-_ |_(0)|__|_(0)] 1972 K5 |
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05-05-2015, 11:49 PM
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#50 |
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Registered User
Join Date: Jun 2006
Location: Lutz, Florida
Posts: 838
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Re: freshly rebuilt sbc will not start
Do you have a full 12V going to the HEI? Some times the old resistor used in the old points distributor gets left in the circuit. The HEI needs full 12V to operate.
Hope you find whatever the issue is
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1967 Red, C10 Short Bed 6.0L T5 5 speed 1967 Orange and Black C50 6.2 Detroit Diesel NV4500, 2 Ton Pickup 1972 White, Chevy Blazer 2WD 67 Dog house 5.3 4L65 2016 Power Tour LH 1955 Red-Cream, Chevrolet Nomad, restoration on hold 2004 Black, Corvette Z06 LS6 convertible (Rock solid Fun) 2011/2018 Power Tour |
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