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#1 |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Truck turns over but wont fire
EDIT 4-30-23: I did start today!!!
1) I had my kill switch set up wrong so I bypassed it. 2) The plugs were completely fouled so I replaced them. 3) When I pulled the distributer I put in back in incorrectly so I fixed that (Thanks Ironangel for all of the great advice). 4) I had mislabeled the plug order on the distributer and therefore, connected the wrong distributer origin wires to the wrong plugs so I fixed that. LOL, check out the picture in post #22 5) The ignition wire had a bulky plastic housing over the female connector so it was very hard to know if it was actually ever properly connected to the battery male blade on the distributor. 6) It's also entirely possible that it wont start with the tach wire connected to the distributer. I'll try to start it tomorrow with the tach wire connected. I have a 1971 K10. I bought it, had a mechanic put in a crate engine and transmission. It took him 4 months. The wiring was a disaster under the dash so I drove it onto a trailer and brought it home. I drove it off the trailer and parked it. I pulled every inch of wire bumper to bumper and replaced it with the American AutoWire Classic update. It took me 4 months because I could only work on it for a few hours per week. I'm done and was overjoyed to start the finished product. It turns over but wont fire. I don't see where any wires got knocked lose. I thought about syphoning out the year old gas and adding new gas. What should I look at? Thanks for the help on this.
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1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James Last edited by K10-Kansas; 04-30-2023 at 11:07 PM. |
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#2 |
Senior Member
![]() Join Date: Feb 2022
Location: Ca
Posts: 497
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Re: Truck turns over but wont fire
Gas could be problem given the 8 months down time but I would verify you have spark first. Then verify fuel at the carb.
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#3 |
Registered User
Join Date: Jan 2000
Location: Wyoming USA
Posts: 2,445
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Re: Truck turns over but wont fire
Start with the basics does it have spark, fuel check to see if you have spark if you do go to fuel is it getting fuel. Did it ever run after engine replacement
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2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327 |
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#4 |
Senior Member
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Location: Kansas City
Posts: 496
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Re: Truck turns over but wont fire
Thanks. I looked up some videos on how to do that and I'll check it out.
__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#5 |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Re: Truck turns over but wont fire
Yes, it ran after the engine and transmission were put in. Thanks for your help on this.
__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#6 |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,094
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Re: Truck turns over but wont fire
I will add when trying to restart a vehicle that has not run in a while.
It is best to have a water source or fire extinguisher close by.
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________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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#7 |
Registered User
![]() Join Date: Sep 2001
Location: Cumming, GA
Posts: 470
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Re: Truck turns over but wont fire
My truck sat for 19 years and the gas in the tank was fine when I fired it up late last year. Today I used gas from the lawn mower gas can because I needed to, that gas was 3 years old and ran fine. Both of these surprised me, just saying I bet old gas isn’t your issue. I bet power to the distributor.
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#8 |
Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 756
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Re: Truck turns over but wont fire
Given it ran before you replaced all wiring....I would focus on wiring. Specifically, ignition (12vdc to yellow wire with key on)
You need to confirm if you have spark. pull a plug lay on block, crank...do you see spark? If so look for fuel delivery issue Your gas age is not a issue |
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#9 |
Registered User
Join Date: Apr 2011
Location: Fairview Park, Ohio
Posts: 1,031
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Re: Truck turns over but wont fire
Timing light is also a very easy way to check for spark
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My build page http://67-72chevytrucks.com/vboard/s...d.php?t=764662 My cabinet building site http://www.cbcabinets.com |
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#10 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Truck turns over but wont fire
Does the truck have an HEI or points ignition? I dont think your problem is fuel, it's something you've done or didn't do in installing the new harness.
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#11 |
68 C10 Longbed
![]() Join Date: Sep 2006
Location: Naples, Florida
Posts: 520
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Re: Truck turns over but wont fire
Yep agree, if it’s HEI be sure you have a solid 12 volts (I usually use the Fused ignition from the under dash fuse block) going to the coil/dizzy etc.. tape up that yellow wire and don’t use it — it’s a resistor wire to be used with points only.
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#12 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,602
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Re: Truck turns over but wont fire
Yellow wire isn’t a resistor wire.
It’s the wire used to supply 12v to the coil (from the starter solenoid) when starting. |
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#13 | |
Senior Member
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Location: Kansas City
Posts: 496
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Re: Truck turns over but wont fire
Quote:
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__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#14 | |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
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Re: Truck turns over but wont fire
Quote:
__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#15 |
Senior Member
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Location: Kansas City
Posts: 496
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Re: Truck turns over but wont fire
Yeah, it was my first time doing anything like this so I bet that's it.
__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#16 |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Re: Truck turns over but wont fire
Yeah, American Autowire had 2 sets of directions for HEI versus points so I followed the directions to sidestep the ballast resistor option.
__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#17 |
68 C10 Longbed
![]() Join Date: Sep 2006
Location: Naples, Florida
Posts: 520
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Re: Truck turns over but wont fire
Yes correct—poor selection of words but I still also get rid of it when switching to HEi.
Last edited by ghackett1; 04-16-2023 at 01:21 PM. |
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#18 | |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,699
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Re: Truck turns over but wont fire
Quote:
Now, back to the regularly scheduled program. |
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#19 | |
68 C10 Longbed
![]() Join Date: Sep 2006
Location: Naples, Florida
Posts: 520
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Re: Truck turns over but wont fire
Quote:
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#20 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Truck turns over but wont fire
Our trucks didn't have ballast resisters, they use a resister wire usually coming from the wire gutter along the firewall to the coil. If your truck had an idle solenoid for the TSC system it used a 10 or 12 gauge pink wire. Buy installing an HEI that resister wire is of no use any more. All you need to do is find a switched terminal on the fuse box, an open spade terminal that is hot only when the key is on, and run a 12 gauge wire from that terminal to the BAT terminal on the HEI. You can actually run a wire straight from the battery + to the HEI and crank the starter, if it fires up you know you had a power issue and need to run that wire from the switched terminal in the fuse block so the truck shuts off with the key. You can 86 that yellow wire too, dont need it anymore. Only two wires for an HEI, the red power supply and the tach wire. Battery should ground to the engine block, the HEI gets it's ground through the block. I mentioned that pink wire because that's what many use for the switched power to the HEI. Since you stripped the factory wiring it may not exist anymore. No biggie, just do the above and your golden. I'm in KC pretty regular, where are located, north hopefully? I ask because I'll be in KC probably tomorrow and later in the week...I'd be glad to swing by and help.
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() Last edited by Ironangel; 04-16-2023 at 01:54 PM. |
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#21 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 504
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Re: Truck turns over but wont fire
Maybe verify the condition of the grounds first. If you had to replace the wiring, those might be a mess too. Bad grounds will make troubleshooting a nightmare
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#22 | |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Re: Truck turns over but wont fire
Quote:
__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#23 |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Re: Truck turns over but wont fire
Thanks. Yeah I put in ground straps and then doubled up by also adding ground wires.
__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#24 |
State of Confusion!
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Location: Gulfport, MS USA
Posts: 46,860
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Re: Truck turns over but wont fire
It is not uncommon at all for the HEI module to just give up with out warning. If you take it out, most auto parts store can test them. I know a lot of folks always carry a spare one in the glove box.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#25 |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Re: Truck turns over but wont fire
The voltage on the 12v wire running to the battery connection on the HEI drops to 9.2 while cranking. The battery itself drops to 9.5 when cranking.
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1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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