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#1 |
Saving one 72 at a time!!
![]() Join Date: Sep 2005
Location: Cypress, TX
Posts: 261
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Experienced Mechanic needs another opinion
I have a 350 SB that will not start....
I have fuel getting to the carb, plugs are moist but not flooded. I have fire to the plugs. When turning the motor over, it wants to start... but just won't. I changed the coil in the HEI and tried again (thinking I wasn't getting enough spark)-- still no dice... So I re-timed it by hand, TDC and re-aligned the rotor in the HEI..Just to make sure. Still no dice... The only other thing I can think is the modulator in the HEI is bad, or that the motor has jumped time. This motor is fresh, it has about 4 hours on it, and the HEI is brand spanking new. Please Help me out with some ideas. |
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#2 |
68 C/10
Join Date: Oct 2003
Location: Houma Louisiana
Posts: 367
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Re: Experienced Mechanic needs another opinion
When you say you retimed it, was the dizzy out, or did it line up ok?
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(2009) GMC Sierra Denali 6.2 AWD (67 C/10 fleetside SWB) (2018GMC Yukon Denali) Wifes Car |
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#3 |
Professional Grade
Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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Re: Experienced Mechanic needs another opinion
sounds like timing to me!
When I set it, I always use a timing light, even setting it by hand. Basically, I find TDC with the truck, making 100% sure I am on the compression stroke using a compression tester with the gauge taken off (makes a whistling noise when air goes through it), then stab the dizzy base in. After I have the base in, I install the cap + wires as close to where they should be as I can, and button it up, less the timing adjustment bolt. I then turn the ignition to ON, and put my inductive timing light onto plug wire number one. I then grab the dizzy cap, and turn it back and forth. Every time you spin past number 1, it should fire, and make the timing light flash. So, get it set as close to number 1 as you can, then tighten the dizzy cap a bit more, and try my best to start it. Sometimes you gotta put the idle screw way in so it'll keep running long enough for you to get around front, and set the timing with the light properly. Make sure you unplug your vac advance when you set the timing, and that your idle is low enough that you arn't getting any mechanical advance. This is crucial, cause as you get closer to the proper timing, she'll idle a bunch, due to you having the idle screw in, so set it to where it should be, turn the idle down, set it again, turn the idle down, set it, etc etc.
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) |
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#4 |
Registered User
Join Date: Nov 2004
Location: Central Ohio
Posts: 215
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Re: Experienced Mechanic needs another opinion
Module or pickup coil in hei ?, timing chain jumped ?
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71 K20 350/350/205, dealer air, 4" lift, Flowtech,Edel 1406 on 2101, procomp HEI,4.10's, 33x12.50x16.5 BFG MT's on slots. 4 wheel disc brakes. My lame K20 page My lame Eaton disc brake page ![]() |
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#5 |
Registered User
Join Date: Nov 2005
Location: WV
Posts: 227
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Re: Experienced Mechanic needs another opinion
look at the little peg(can't remember th proper name for it)inside center of cap they will burn up over time.
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1993 K1500 350 5 speed ![]() 1985 K10 Silverado Vortec 406 5 speed (in body shop) "I been drivin' this '85 pickup truck Them buddies of mine call it a bucket of rust She's a little beat up but she still runs like the wind Yeah, kinda like me I been banged and bruisedBeen around the block a time or two But I'm runnin' like new goin' places I never been No, I ain't broke I'm just broken in" 1963 Dodge Townwagon(its amazng what 30 years and zero miles will do to a vehicle ![]() Member#20327 |
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#6 |
Registered User
![]() Join Date: Aug 2005
Location: Hillsboro Oregon
Posts: 6,449
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Re: Experienced Mechanic needs another opinion
Open port on the carb or intake???
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#7 |
18 Till I Die
Join Date: Mar 2005
Location: Alberta, Canada
Posts: 1,522
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Re: Experienced Mechanic needs another opinion
Make sure you have 12v in "start" and "run". I have seen where they have 12v in start but as soon as you let go of the key to the run position there is no 12v anymore. It wants to start but then quicky dies when you let go of the key......M2C worth
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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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#8 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Experienced Mechanic needs another opinion
Could it be 180 degrees out on the distributer? You said the engine had 4 hours on it . Did it just all of a sudden decide not to start or did you get a backfire and then it wouldn't start?
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#9 |
Saving one 72 at a time!!
![]() Join Date: Sep 2005
Location: Cypress, TX
Posts: 261
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Re: Experienced Mechanic needs another opinion
Russell,
I know I have the motor at TDC, by my finger, exhaust sucks and compression blows my finger out... Balancer and marker lined up at zero, a little retarded by close enough to start... Rotor at #1 plug... My problem is that it won't start, Once I get it running I can finalize the timing. I need to easly determine in the chain jumped. I guess I could check to see it fire and mark happens at the same time. but thats kinda tough being a one man army... I have an old HEI, i'll try and clean up and drop it in tomorrow and see if I can eliminate it to the Distributor |
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#10 |
Saving one 72 at a time!!
![]() Join Date: Sep 2005
Location: Cypress, TX
Posts: 261
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Re: Experienced Mechanic needs another opinion
Vet vet,
It ran fine, then sat up for about 2 years, I started it up on Super Bowl Sunday, ran great, Then Monday I moved it out and let it run for a few minutes, when I went to put it up, it ran real rough and real rich, the barked a little when I shut it off. Then today it just wouldn't start. |
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#11 |
Senior Member
![]() Join Date: Jan 2004
Location: Olathe KS (Greater Kansas City MO Area)
Posts: 2,070
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Re: Experienced Mechanic needs another opinion
I hate to be such a simpleton here, but do you have good gas?
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#12 |
Saving one 72 at a time!!
![]() Join Date: Sep 2005
Location: Cypress, TX
Posts: 261
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Re: Experienced Mechanic needs another opinion
Mike,
Yea, I drained and refueled |
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#13 |
68 C/10
Join Date: Oct 2003
Location: Houma Louisiana
Posts: 367
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Re: Experienced Mechanic needs another opinion
Could it be stuck floats in the carb? Maybe gummed up?
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(2009) GMC Sierra Denali 6.2 AWD (67 C/10 fleetside SWB) (2018GMC Yukon Denali) Wifes Car Last edited by 68cajun; 02-12-2006 at 10:27 PM. |
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#14 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Experienced Mechanic needs another opinion
did you run a new wire to the HEI or is the original (resistor circuit)wiring being used ???
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#15 |
Saving one 72 at a time!!
![]() Join Date: Sep 2005
Location: Cypress, TX
Posts: 261
|
Re: Experienced Mechanic needs another opinion
68 Cajun,
If the floats were stuck, wouldn't the plugs be saturated? The plugs now are pretty dry, but I can see fuel dripping down the throat when I hold the primarys open and work the accelerator pump. I also tried to start it spraying Gumout directly down the primarys while turning it over. Cdowns, I did run a new wire during the restore, I checked volatge with the key "on" at the harness going into the "BAT" terminal on the cap- I have 12.4 volts What do you think besides that - do you think I should check if its holding voltage while I am trying to start it ??? appreciate the help guys. Cypress |
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#16 |
Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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Re: Experienced Mechanic needs another opinion
sounds like a problem with the dizzy or timing
remove cap and turn over make sure rotor in turning smooth my first try would be to pull the dizzy out. and inspect bottom gear, screw-clip crap near poll piece.bad broken poll piece wire got a points dizzy to put in.or another hei to test make sure rotor is at number 1 on cap on tdc |
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#17 |
Registered User
Join Date: Dec 2003
Location: here
Posts: 5,789
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Re: Experienced Mechanic needs another opinion
Im thinking its a fuel problem. If it ran fine one day & bad the next & you didnt change anything in between It cant hardly be a misaligned distributor or rotor. If the module went it wouldnt try to start like you said its doing. Id try a fuel filter or easier yet dump a little gas in the carb & see if it runs good for a second or two. If it does get a new pump or see if theres a carb crab. Good luck with it...corn
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#18 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Experienced Mechanic needs another opinion
You have gas fouled plugs.
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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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#19 |
Broke and still trying
Join Date: Apr 2003
Location: Alameda, CA
Posts: 562
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Re: Experienced Mechanic needs another opinion
check condition of rotor and cap...badly cracked or broken. I had that problem. Check the simplest and go for the worse. check wiring to HEI, then cap/rotor, then firing order, then plugs and so on. You'd be amazed how many little things keep an engine from starting.
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#20 | |
Senior Member
Join Date: Jan 2005
Location: Raleigh, NC
Posts: 894
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Re: Experienced Mechanic needs another opinion
Quote:
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#21 |
Registered User
![]() Join Date: Mar 2005
Location: Tinley Park Il.
Posts: 144
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Re: Experienced Mechanic needs another opinion
SPARK PLUGS. Take one off, conect the wire and ground the plug on top of the engine and crank the engine over so you can see how much spark is going true the plug.
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#22 |
Registered User
Join Date: Dec 2003
Location: here
Posts: 5,789
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Re: Experienced Mechanic needs another opinion
Or condensation in the cap. WD-40
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#23 |
Lurky lurky
Join Date: Sep 2005
Location: Maryville, TN
Posts: 553
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Re: Experienced Mechanic needs another opinion
Check for spark at the plugs.
Change the plugs out (if you have some more around). Try leaving the key "on" and jumping the starter to eliminat an electrical problem while the ignition switch is at "start." You say it was running as is a few weeks ago, so that eliminates the distributor being 180 out. Gas is fresh, so that's out. The only other thing I can say is maybe the valves aren't adjusted right/too tight and are either hanging open or staying closed or something else mechanical inside the engine. Good luck with it, I hope it's something simple. |
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#24 |
PROUD TO BE A MEMBER
Join Date: Sep 2005
Location: Jax Florida
Posts: 234
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Re: Experienced Mechanic needs another opinion
if i understood you this thing sat for two years ,any one move in the exhaust system while it sat ,ie mud dobbers ,mice ,kids toys ect.
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#25 |
Active Member
Join Date: Apr 2005
Location: Miami, Florida
Posts: 286
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Re: Experienced Mechanic needs another opinion
Check the fuel filter in the carb?
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