250 6 cylinder won't start - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mdoncall · 05-03-2005, 11:20 PM

Great to find a website for Chevy truck owners and i could sure use some help from any and all with a motor prob i have.I have a 1972 Chevy C/10 with the original 250 six banger in it.The truck has been sitting for four years without being ran and i recently decided to put it back in use and start a restore project on it.The truck was running fine when it was last ran four years ago.I'll try to keep this brief and not take up too much space here.I have installed new plugs,points,condenser,plug wires,coil,dist.cap and a rotor button.She still won't run.I made sure the rotor button was installed correctly and the points gapped right and the firing order was right.I'm at an end and don't have a clue as to what to check next.Sorry for the lengthy post but any and all help is much appreciated.

**VetteVet** · 05-04-2005, 01:40 AM

Well you mentioned the ignition system but what about fuel and compression. Are you getting a spark? Did you clean out the fuel tank, put in a new filter and clean the carb. You could have some valves stuck open. Did you change the oil and filter. You should. I would pull the valve cover and see if all the valves are moving.

Fred T · 05-04-2005, 02:36 AM

Vette asks some good questions. Start with the basics.

Fuel. Does the carb squirt fuel when the throttle is pumped? If not, check the flow by disconnecting the fuel line and pumping into a container by cranking the engine. No flow, check the lines, filter and pump.

Ignition. Remove a spark plug that you can lay on a grounded surface and crank the engine. No spark, remove the distributor cap and see if the points are opening. Use a voltmeter and start checking voltages, making sure you have power in and out of the coil and distributor.

If you have fuel and spark, check your plug wires for the proper order. The firing order is 1-5-3-4-2-6. #1 on the cap is about 2 o'clock, the spot closest to the #1 plug. Go clockwise on the firing order. As long as you didn't move the distributor the timing should be okay, but that is next to check.

**VetteVet** · 05-04-2005, 01:14 PM

Fred he said he has the 250 six banger , isn't that the inline six? What would the firing order be for that?

**'68OrangeSunshine** · 05-06-2005, 01:43 AM

Quote:

Originally Posted by VetteVet

Fred he said he has the 250 six banger , isn't that the inline six? What would the firing order be for that?

1_5_3_6_2_4. Clockwise Firing Order.
Clockwise to ADV, CCW to retard.
HTH

79C10 · 05-04-2005, 01:49 PM

The 250 is an inline six.

My bet is on the carburator. sitting for four years has no doubt dried out some of the gaskets in the carb not to mention other places. I bet it needs to be rebuilt. I would check spark first and if you have spark the dump a little gas down the carb and then see if she'll fire up.

05-04-2005, 01:40 AM	#2
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,703	Well you mentioned the ignition system but what about fuel and compression. Are you getting a spark? Did you clean out the fuel tank, put in a new filter and clean the carb. You could have some valves stuck open. Did you change the oil and filter. You should. I would pull the valve cover and see if all the valves are moving. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

05-04-2005, 02:36 AM	#3
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Vette asks some good questions. Start with the basics. Fuel. Does the carb squirt fuel when the throttle is pumped? If not, check the flow by disconnecting the fuel line and pumping into a container by cranking the engine. No flow, check the lines, filter and pump. Ignition. Remove a spark plug that you can lay on a grounded surface and crank the engine. No spark, remove the distributor cap and see if the points are opening. Use a voltmeter and start checking voltages, making sure you have power in and out of the coil and distributor. If you have fuel and spark, check your plug wires for the proper order. The firing order is 1-5-3-4-2-6. #1 on the cap is about 2 o'clock, the spot closest to the #1 plug. Go clockwise on the firing order. As long as you didn't move the distributor the timing should be okay, but that is next to check. __________________ Fred There is no such thing as too much cam...just not enough engine.

05-04-2005, 01:14 PM	#4
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,703	Fred he said he has the 250 six banger , isn't that the inline six? What would the firing order be for that? __________________ 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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05-03-2005, 11:20 PM	#1
mdoncall Registered User Join Date: Apr 2005 Posts: 1	250 6 cylinder won't start Great to find a website for Chevy truck owners and i could sure use some help from any and all with a motor prob i have.I have a 1972 Chevy C/10 with the original 250 six banger in it.The truck has been sitting for four years without being ran and i recently decided to put it back in use and start a restore project on it.The truck was running fine when it was last ran four years ago.I'll try to keep this brief and not take up too much space here.I have installed new plugs,points,condenser,plug wires,coil,dist.cap and a rotor button.She still won't run.I made sure the rotor button was installed correctly and the points gapped right and the firing order was right.I'm at an end and don't have a clue as to what to check next.Sorry for the lengthy post but any and all help is much appreciated.

05-04-2005, 01:49 PM	#6
79C10 Registered User Join Date: Jan 2005 Location: Northern Vermont Posts: 159	The 250 is an inline six. My bet is on the carburator. sitting for four years has no doubt dried out some of the gaskets in the carb not to mention other places. I bet it needs to be rebuilt. I would check spark first and if you have spark the dump a little gas down the carb and then see if she'll fire up.



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