Swapped motor starting issue - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jmoney01 · 07-31-2021, 09:24 PM

I swapped the 292 4 speed out for a 350 5 speed in my 1 ton. I have fire at the plugs, I think it is in time close enough to start, I have gas, but it's not even trying to start. Is there a wire that I'm missing? I have the hei, alt, and starter hooked up. No dummy light wires yet. I'm kinda lost. Fuel, fire, compression, start?? I've been here before, but this is giving me fits.

Thanks all

Ziegelsteinfaust · 07-31-2021, 10:38 PM

My guess based on you have fuel, air, and spark. Would be the distributor is out of time. If the dizzy tried to fire to far after TDC it will act like it is not even trying to start.

Nick_R_23 · 07-31-2021, 11:17 PM

Check all of your FACTS (Fuel, Air, Compression, Timing, Spark)

Check for +12v at the distributor when cranking.

Verify you have the correct TDC and not 180* out. If you remove the valve cover or are lucky enough to have the oil cap over #1 valves, you should see the #1 intake valve closing just before TDC, and the exhaust valve moving just after TDC. Movement should be nearly immediate when turning the engine by hand.

Verify that you have a squirt of fuel from the accelerator pump when the throttle linkage is cycled.

Verify that the throttle is cracked slightly (throttle lever resting on idle screw - no gap)

Perform a compression test to verify a healthy engine if needed.

**Palf70Step** · 08-01-2021, 07:39 AM

Timing way off is what comes to mind for me. Only other thing popping to mind is plug wires off also. Sounds more like a timing issue if you have spark at plugs and fuel at carb.

cadillac_al · 08-01-2021, 09:08 AM

Did you do anything to the 350 before installing it?

**Corts60** · 08-01-2021, 03:23 PM

Agree with above you are most likely out of time if you’re 100% you have spark and fuel.

07-31-2021, 10:38 PM	#2
Ziegelsteinfaust Registered User Join Date: Dec 2012 Location: Temple City Posts: 3,558	Re: Swapped motor starting issue My guess based on you have fuel, air, and spark. Would be the distributor is out of time. If the dizzy tried to fire to far after TDC it will act like it is not even trying to start.

07-31-2021, 11:17 PM	#3
Nick_R_23 Registered User Join Date: May 2016 Location: Willow, Alaska Posts: 836	Re: Swapped motor starting issue Check all of your FACTS (Fuel, Air, Compression, Timing, Spark) Check for +12v at the distributor when cranking. Verify you have the correct TDC and not 180* out. If you remove the valve cover or are lucky enough to have the oil cap over #1 valves, you should see the #1 intake valve closing just before TDC, and the exhaust valve moving just after TDC. Movement should be nearly immediate when turning the engine by hand. Verify that you have a squirt of fuel from the accelerator pump when the throttle linkage is cycled. Verify that the throttle is cracked slightly (throttle lever resting on idle screw - no gap) Perform a compression test to verify a healthy engine if needed.

08-01-2021, 07:39 AM	#4
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,608	Re: Swapped motor starting issue Timing way off is what comes to mind for me. Only other thing popping to mind is plug wires off also. Sounds more like a timing issue if you have spark at plugs and fuel at carb. __________________ 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!

08-01-2021, 09:08 AM	#5
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,332	Re: Swapped motor starting issue Did you do anything to the 350 before installing it? __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10

08-01-2021, 03:23 PM	#6
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,672	Re: Swapped motor starting issue Agree with above you are most likely out of time if you’re 100% you have spark and fuel. __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725

07-31-2021, 09:24 PM	#1
Jmoney01 Registered User Join Date: Dec 2018 Location: Borden Posts: 97	Swapped motor starting issue I swapped the 292 4 speed out for a 350 5 speed in my 1 ton. I have fire at the plugs, I think it is in time close enough to start, I have gas, but it's not even trying to start. Is there a wire that I'm missing? I have the hei, alt, and starter hooked up. No dummy light wires yet. I'm kinda lost. Fuel, fire, compression, start?? I've been here before, but this is giving me fits. Thanks all

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