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07-09-2002, 07:32 PM
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#1 |
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Senior Member
Join Date: Jan 2002
Location: Vienna, Ohio, USA
Posts: 259
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Truck won't shut off
Truck has HEI wired to IGN unfused at fuse box. When I turn the key off it runs for another 5 to 10 seconds then shuts off.
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72 Chevy A/C P/B P/S Tilt 454 Engine 400 TCI Trans C30 Frame C10 Suspension Short Wheel Base (Dually) |
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07-09-2002, 08:03 PM
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#2 |
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So Many Ideas, So Little Money
Join Date: Sep 2001
Location: Marshalltown, IA
Posts: 1,610
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its not runnin too rich and just dieseling because of that is it?, my radio keeps playin for 3-5seconds after I shut it off, itswired to acc fused
Bryce
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72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu  Marshalltown, Iowa |
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07-09-2002, 08:24 PM
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#3 |
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Account Suspended
Join Date: Mar 2001
Location: Virginia Beach, Va. U.S.A.
Posts: 15,320
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Advance the timing a little and see if that fixes it.
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07-09-2002, 10:07 PM
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#4 |
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Registered User
Join Date: May 2002
Location: Spokane, WA
Posts: 93
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Do you have an electric fan? I know my truck has trouble shutting off when it's on. I'm getting around to fixing it soon.
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1969' LWB [Work in Progress] |
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07-09-2002, 11:12 PM
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#5 |
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Registered User
 
Join Date: Oct 2001
Location: Southern New Mexico
Posts: 649
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I have ALL OF A SUDDEN developed this problem and I just recently installed electric fans. The fans and HEI are sharing the same power plug on the fuse box.
Hmm I wonder BTW its not deiseling |
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07-10-2002, 01:10 AM
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#6 |
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Transcendental Trucker
Join Date: Dec 2001
Location: Rockaway Beach, OR
Posts: 374
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The electric fans will do it. Distributor and electric fans must not be connected in any way.
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Patrick Sullivan | sullivan@oregoncoast.com Rockaway Beach, Oregon 1972 Chevy Cheyenne C-20 1998 Dodge Dakota 4x4 So, fill to me the parting glass And drink a health whate'er befalls... Then gently rise and softly call Goodnight and joy be to you all! |
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07-10-2002, 03:59 AM
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#7 |
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Registered User
Join Date: May 2002
Location: Greer, SC
Posts: 82
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Please explain the logic behind all this. Are the fans holding enough charge to feed the HEI for a couple of seconds? My truck did the same thing a while back when I converted to HEI. After changing the resistance wire so the HEI could pull 12 v I had no problem. I still don't understand what was holding charge then.
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07-10-2002, 04:40 AM
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#8 |
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Transcendental Trucker
Join Date: Dec 2001
Location: Rockaway Beach, OR
Posts: 374
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After you turn the ignition off, the electric fan doesn't stop spinning immediately. For the 10 or so seconds it is still spinning, the fan itself is acting as a generator, feeding energy back up to your ignition system.
This Cartalk Puzzler explains in more detail.
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Patrick Sullivan | sullivan@oregoncoast.com Rockaway Beach, Oregon 1972 Chevy Cheyenne C-20 1998 Dodge Dakota 4x4 So, fill to me the parting glass And drink a health whate'er befalls... Then gently rise and softly call Goodnight and joy be to you all! |
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07-10-2002, 06:35 AM
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#9 |
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Registered User
Join Date: May 2002
Location: Greer, SC
Posts: 82
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But to generate that much power amazes me. Well I guess it isnt really all that much. An electric motor works with magnets on the outside with a commutator in the middle. An electro magnet is created in the center pulling the comm around. Now the generator has electro magnets on the comm and outside correct?? interesting none the less...
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07-10-2002, 06:53 AM
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#10 |
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Transcendental Trucker
Join Date: Dec 2001
Location: Rockaway Beach, OR
Posts: 374
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Aye, it confuses me as well. I'm gonna have to try it when I get an electric fan..
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Patrick Sullivan | sullivan@oregoncoast.com Rockaway Beach, Oregon 1972 Chevy Cheyenne C-20 1998 Dodge Dakota 4x4 So, fill to me the parting glass And drink a health whate'er befalls... Then gently rise and softly call Goodnight and joy be to you all! |
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07-10-2002, 11:46 AM
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#11 |
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Recovering Truck Driver
Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
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It could be a problem with your alternator, like the diode trio. disconnect your ammeter/volt meter and see if you still have the problem, they can supply voltage to the engine through the guage and keep it running.
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska |
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07-10-2002, 12:23 PM
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#12 |
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TOTY 2006
 
Join Date: Dec 1999
Location: Magalia CA USA
Posts: 2,270
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GMCJunkie's hubby's truck is doing the same thing, and he says it is the electric fan. He showed this to me last weekend when I went out to pick up the rear A/C parts for a suburban.....
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07-10-2002, 05:12 PM
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#13 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Its true, the fans will do it. At an idle, it only takes about 4 volts to fire the ignition....way less if you still have points. The fan(s) can, and do produce this kind of voltage.
John, you are one lucky b@stard. 
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07-10-2002, 10:41 PM
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#14 |
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Senior Member
Join Date: Jan 2002
Location: Vienna, Ohio, USA
Posts: 259
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Thanks Guys!!!!!
It was the electric fan, had it wired into the hot to distributor.
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72 Chevy A/C P/B P/S Tilt 454 Engine 400 TCI Trans C30 Frame C10 Suspension Short Wheel Base (Dually) |
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07-10-2002, 10:44 PM
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#15 |
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Registered User
Join Date: May 2000
Location: Victoria, BC, Canada
Posts: 2,410
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Its either running too rich or your idle is set too high. Knock it down a little and see if the problem persists.
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1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first. |
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