81 chevy no power

jake1971 · 03-26-2009, 01:06 PM

305 ci. 350 trans Q carb hei dis. will start and run,but has no power.sounds odd when runs.when i put it in gear and give it gas,sounds like the valves rattle.put in new cap,rotter,wires,coil,check timing,no change.

Case 7230 · 03-26-2009, 01:54 PM

All I can suggest is to check for a restricted exhaust.

leolkfrm · 03-26-2009, 03:15 PM

welcome to the forum
did it happen over time or all of a sudden?

jake1971 · 03-27-2009, 09:42 AM

Quote:

Originally Posted by leolkfrm

welcome to the forum
did it happen over time or all of a sudden?

it happen suddenly,i was about a 1/2 mile from home.i just got it there .

Case 7230 · 03-27-2009, 10:49 AM

Check that your EGR valve is not stuck open.

hotrodpc · 03-27-2009, 12:49 PM

I didn't know 305's have any power to begin with, it may be normal. OK, I know, not funny. How many miles? Check EGR is a good suggestion. Since it happened the way you say it did, is it possible it jumped time? Maybe time for chain and gears. I guess one way to tell would be use a timing light. If your marks are way off, then you pretty much know the chain jumped time. It will still run a tooth or 2 off, but not very well. If it is the chain, it should have problems ideling too and only want to run at higher rpm. I'd say if it idles OK, this is not your problem, but the same goes for stuck EGR too.

gmctrucks · 03-27-2009, 06:43 PM

I say if it's the OEM Cat just replace it Ebay has good free flowing Cats cheap. Like Magnaflow.

hotrodpc · 03-27-2009, 06:55 PM

True, if it still has OEM Cat, you sure won't be wasting your money even if that is not your problem.

jake1971 · 03-29-2009, 11:16 AM

Quote:

Originally Posted by hotrodpc

True, if it still has OEM Cat, you sure won't be wasting your money even if that is not your problem.

I thank everyone who gave me help.They were all good things to check.And the 305 joke is true,but the price was good a few years ago.I check the fuel pressure and it was ok and pulled the fuel filter.I open it up and it was ok,on dirt.Put in a new one and started it up,no change.So i sprayed the Q carb with choke and carb cleaner,some in the vent tube and started it.It ran a little better.So i sprayed a lot down the vent tube and let it sit far a long time.This time when i started it ,it ran good for a 305.I think the float is sticking.After look over the Q carb real good,the throttle shafts are lose and its in bad shape.Time for a new carb.If anyone know of a good carb that helps with good gas milage,Let me know.Once more i would like to thank everone for the help.

gmctrucks · 03-29-2009, 04:18 PM

Again I say look on Ebay for a Carb & Cat if yours is the original.

03-26-2009, 01:06 PM	#1
jake1971 Junior Member Join Date: Mar 2009 Posts: 3	81 chevy no power 305 ci. 350 trans Q carb hei dis. will start and run,but has no power.sounds odd when runs.when i put it in gear and give it gas,sounds like the valves rattle.put in new cap,rotter,wires,coil,check timing,no change.

03-26-2009, 03:15 PM	#3
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,927	welcome to the forum did it happen over time or all of a sudden? __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

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03-26-2009, 01:54 PM	#2
Case 7230 Senior Member Join Date: Dec 2007 Posts: 666	All I can suggest is to check for a restricted exhaust.

03-27-2009, 10:49 AM	#5
Case 7230 Senior Member Join Date: Dec 2007 Posts: 666	Check that your EGR valve is not stuck open.

03-27-2009, 12:49 PM	#6
hotrodpc Senior Member Join Date: Jul 2008 Location: OK Posts: 6,936	I didn't know 305's have any power to begin with, it may be normal. OK, I know, not funny. How many miles? Check EGR is a good suggestion. Since it happened the way you say it did, is it possible it jumped time? Maybe time for chain and gears. I guess one way to tell would be use a timing light. If your marks are way off, then you pretty much know the chain jumped time. It will still run a tooth or 2 off, but not very well. If it is the chain, it should have problems ideling too and only want to run at higher rpm. I'd say if it idles OK, this is not your problem, but the same goes for stuck EGR too.

03-27-2009, 06:43 PM	#7
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,645	I say if it's the OEM Cat just replace it Ebay has good free flowing Cats cheap. Like Magnaflow.

03-27-2009, 06:55 PM	#8
hotrodpc Senior Member Join Date: Jul 2008 Location: OK Posts: 6,936	True, if it still has OEM Cat, you sure won't be wasting your money even if that is not your problem.

03-29-2009, 04:18 PM	#10
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,645	Again I say look on Ebay for a Carb & Cat if yours is the original.