Truck Is running like crap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jfrank133 · 07-24-2005, 08:46 AM

well i finish intalling the head gasket on my 305, after finishing i ran the truck and it ran good for the 1st 3 miles and then it started running very ruff, I thought it was the timing but the timing is good, I double check distributor and its also good, i placed piston #1 top dead center and checked the distributor and its pointing to piston #1, do i need to rotate the distrubutor again, and line it up again. Im lost right now dont know my next move, please help.

Nolowrider · 07-24-2005, 10:12 AM

I think I would double check the valves (too tight or too looses) and check the head bolts (may need to re-tourque). As for the dizzy, do you have a computer on the vehicle? If you do, I think the timming is controlled by that, cannot adjust without a special plug for the computer. If not, the rotor should be pointing to the #1 lug on the dizzy, not the actual #1 piston in the block. Hope this helped.

jfrank133 · 07-25-2005, 09:25 AM

Thanks for the response Nolowrider, I tourque all the bolts to spec from the heads to the intake manifold, Heads Torque to: 65 ft-lbs, manifold to: 30 ft-lbs. There is no computer on the truck. right before putting all back i made sure that the timing was set correctly and it is pointing to the #1 lug instead of the #1 piston. The Valves looked good when i reinstalled the heads. I was told that it could be my fuel injected carb, but i never missed with it, when i replaced the heads, Is there anything that can go wrong with the carb if i took it off?

86 GMG · 07-25-2005, 10:27 AM

i dont know for sure so take this with a grain of salt but it seem to me a trottle body carb can get messed up some how if you take it off and turn it upside down? like i said i dont know for sure come on guys out there help educate us young wiper snappers

jfrank133 · 07-25-2005, 11:32 AM

I did turned it upside down when i cleaned the carb, is there something that i must do to check the carb out and make sure all the interior components are working properly.

piecesparts · 07-25-2005, 01:14 PM

You say the valves looked good. Did you take the head off and re-install it without adjusting the valves? That is a no-no, you should adjust the valves when you do work like this.

larry may · 07-30-2005, 11:50 PM

Could be bent push rod 1 or more , did you check distributor cap for chip or crack , heaven forbid flat lobe on camshaft.

magnethead · 07-31-2005, 11:20 AM

something tells me that is probably the problem..

07-25-2005, 10:27 AM	#4
86 GMG Registered User Join Date: Apr 2005 Location: Tulsa Oklahoma Posts: 943	i dont know for sure so take this with a grain of salt but it seem to me a trottle body carb can get messed up some how if you take it off and turn it upside down? like i said i dont know for sure come on guys out there help educate us young wiper snappers __________________ square body trucks an addiction or an investment either way they consume all my extra time and money

07-24-2005, 08:46 AM	#1
jfrank133 AUSTIN TX Join Date: Sep 2004 Location: Austin, Texas Posts: 135	Truck Is running like crap well i finish intalling the head gasket on my 305, after finishing i ran the truck and it ran good for the 1st 3 miles and then it started running very ruff, I thought it was the timing but the timing is good, I double check distributor and its also good, i placed piston #1 top dead center and checked the distributor and its pointing to piston #1, do i need to rotate the distrubutor again, and line it up again. Im lost right now dont know my next move, please help.

07-24-2005, 10:12 AM	#2
Nolowrider Senior Member Join Date: Jan 2005 Location: New Orleans Posts: 1,365	I think I would double check the valves (too tight or too looses) and check the head bolts (may need to re-tourque). As for the dizzy, do you have a computer on the vehicle? If you do, I think the timming is controlled by that, cannot adjust without a special plug for the computer. If not, the rotor should be pointing to the #1 lug on the dizzy, not the actual #1 piston in the block. Hope this helped.

07-25-2005, 09:25 AM	#3
jfrank133 AUSTIN TX Join Date: Sep 2004 Location: Austin, Texas Posts: 135	Thanks for the response Nolowrider, I tourque all the bolts to spec from the heads to the intake manifold, Heads Torque to: 65 ft-lbs, manifold to: 30 ft-lbs. There is no computer on the truck. right before putting all back i made sure that the timing was set correctly and it is pointing to the #1 lug instead of the #1 piston. The Valves looked good when i reinstalled the heads. I was told that it could be my fuel injected carb, but i never missed with it, when i replaced the heads, Is there anything that can go wrong with the carb if i took it off?

07-25-2005, 11:32 AM	#5
jfrank133 AUSTIN TX Join Date: Sep 2004 Location: Austin, Texas Posts: 135	I did turned it upside down when i cleaned the carb, is there something that i must do to check the carb out and make sure all the interior components are working properly.

07-25-2005, 01:14 PM	#6
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	You say the valves looked good. Did you take the head off and re-install it without adjusting the valves? That is a no-no, you should adjust the valves when you do work like this.

07-30-2005, 11:50 PM	#7
larry may Senior Member Join Date: Jul 2005 Location: MISSOURI Posts: 3,256	Could be bent push rod 1 or more , did you check distributor cap for chip or crack , heaven forbid flat lobe on camshaft.

07-31-2005, 11:20 AM	#8
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	something tells me that is probably the problem..



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