hesitation? pcv? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

willow72 · 04-20-2005, 05:57 PM

my truck has a hesatation when i take off. if i hold my foot on the brake and give it gas it runs pretty rough until i hit about 2000 rpms then it smoothes out the timing is set at 10 degrees like the engine suppose too be could it be the distribitor its a gm hei witha msd box hooked to it. question #2do yall think its ok to run a pcv valve in both valve covers or not?

**pjmoreland** · 04-20-2005, 06:27 PM

I don't see why it would be a problem to put a PCV valve in both covers as long as you still have a breather on one of your valve covers to let clean air into the crank case. You wouldn't want to replace the breather with a second PCV valve.

willow72 · 04-20-2005, 07:15 PM

no im wanting to replace the hose that hooks too the bottom of the air filter that sets on the carb i didnt know you had to lrt clean air into the crank case i just figured that since i only have 2 holes in 1 valve cover and 1 hole in the other one that 1 hole is for adding oil 1 for the pcv valve 1 for the hose in the air filter on carb im pretty sure they are all hooked to vacume off the carb except the oil cap which is basicaly a chrome coverd rubber gromet should i have a forth hole?thanks for any input on any of these questions, john

**pjmoreland** · 04-20-2005, 07:41 PM

The fat hose coming from your air filter is providing clean air to your crank case, and your carburetor sucks the air and any fuel vapors that are in your crank case up through the PCV valve. You can replace the fat hose coming from your air filter with a breather if you don't want to deal with the hose.

willow72 · 04-21-2005, 06:35 AM

ttt

ezernut9mm · 04-21-2005, 06:41 AM

my hei is kinda wore out. check the posts the advance weights sit on and see if they are wore. also check the springs. make sure everything inside is working properly. i think this is part of my hesitation. along with a carb that needs rebuilding.

also, i think stock timing is 8* btdc, but 10 shouldn't really matter i don't think.

just some food for thought...

willow72 · 04-21-2005, 05:40 PM

thanks i will do that it all started right after i burned a hole right thru the cap can it just get dirty in there and cause something like that too?

willow72 · 04-22-2005, 06:31 AM

ttt

ezernut9mm · 04-22-2005, 07:00 AM

i'm sure dirt particles can cause the spark to jump around and fire properly, but i think the biggest problem with a hole in the cap would be getting moinsture in the cap causing it to not run or run really rough.

04-20-2005, 05:57 PM	#1
willow72 Registered User Join Date: Nov 2003 Location: dallas/ftwoth Posts: 112	hesitation? pcv? my truck has a hesatation when i take off. if i hold my foot on the brake and give it gas it runs pretty rough until i hit about 2000 rpms then it smoothes out the timing is set at 10 degrees like the engine suppose too be could it be the distribitor its a gm hei witha msd box hooked to it. question #2do yall think its ok to run a pcv valve in both valve covers or not?

04-21-2005, 06:41 AM	#6
ezernut9mm Registered User Join Date: Feb 2005 Location: kansas city, mo. Posts: 224	my hei is kinda wore out. check the posts the advance weights sit on and see if they are wore. also check the springs. make sure everything inside is working properly. i think this is part of my hesitation. along with a carb that needs rebuilding. also, i think stock timing is 8* btdc, but 10 shouldn't really matter i don't think. just some food for thought... __________________ '06 silverado (daily driver) '02 nissan sentra (wal-mart warrior)

04-22-2005, 07:00 AM	#9
ezernut9mm Registered User Join Date: Feb 2005 Location: kansas city, mo. Posts: 224	i'm sure dirt particles can cause the spark to jump around and fire properly, but i think the biggest problem with a hole in the cap would be getting moinsture in the cap causing it to not run or run really rough. __________________ '06 silverado (daily driver) '02 nissan sentra (wal-mart warrior)

04-20-2005, 06:27 PM	#2
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,982	I don't see why it would be a problem to put a PCV valve in both covers as long as you still have a breather on one of your valve covers to let clean air into the crank case. You wouldn't want to replace the breather with a second PCV valve.

04-20-2005, 07:15 PM	#3
willow72 Registered User Join Date: Nov 2003 Location: dallas/ftwoth Posts: 112	no im wanting to replace the hose that hooks too the bottom of the air filter that sets on the carb i didnt know you had to lrt clean air into the crank case i just figured that since i only have 2 holes in 1 valve cover and 1 hole in the other one that 1 hole is for adding oil 1 for the pcv valve 1 for the hose in the air filter on carb im pretty sure they are all hooked to vacume off the carb except the oil cap which is basicaly a chrome coverd rubber gromet should i have a forth hole?thanks for any input on any of these questions, john

04-20-2005, 07:41 PM	#4
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,982	The fat hose coming from your air filter is providing clean air to your crank case, and your carburetor sucks the air and any fuel vapors that are in your crank case up through the PCV valve. You can replace the fat hose coming from your air filter with a breather if you don't want to deal with the hose.

04-21-2005, 06:35 AM	#5
willow72 Registered User Join Date: Nov 2003 Location: dallas/ftwoth Posts: 112	ttt

04-21-2005, 05:40 PM	#7
willow72 Registered User Join Date: Nov 2003 Location: dallas/ftwoth Posts: 112	thanks i will do that it all started right after i burned a hole right thru the cap can it just get dirty in there and cause something like that too?

04-22-2005, 06:31 AM	#8
willow72 Registered User Join Date: Nov 2003 Location: dallas/ftwoth Posts: 112	ttt



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