need some help from the inline six guys - The 1947 - Present Chevrolet & GMC Truck Message Board Network

big10ratrod77 · 08-15-2010, 09:20 AM

well i got my 79 home yesterday put like 30 miles on it yesterday driving it around on my short road

well its got a few minor porblems the choke dosent work and its hard starting first thing in the morning, the choke set up is an eletric choke on a rockchester verijet progressive 2bbl eny ideas how to solve that problem?

the only other problem with it is that when you accelerate sometimes it hesitates and then revs up perty high. do yall think i need to do a rebuild on my carb? or is somthin just not adjusted right?

thanks
josh

D13 · 08-15-2010, 06:45 PM

Stumble then rev is usually a bad accelerator pump. Time for a rebuild.

As far as the choke, make sure it has power, trace the wiring circuit to be sure it is correct. Not sure about choke availability, last resort is a hand choke.

Every now and then these show up on evilflay....

1LowToy · 08-15-2010, 07:48 PM

I have the same carb. They are set from the factory so horibly lean the need to warm up before you can drive it in colder weather. I've checked all the emissions equipment and so on, they just run lean. I've even had the smog guy from the state say my truck is horibly lean according to the emissions readings.

Some say it's due to a cracked head between the intake and exhaust. I have not found a problem in mine like that at this point and have not seen it for myself.

My carburator was loose at the base and from the base to the bowl before the rebuild.

I have found there is a hose from the PCV valve that sets right above the exhaust manifold. Very hot area and yes it did have a hole in it.

I rebuilt the carb, set the float level to spec. When/if I pull the carb off again i'm going to open up the idle jet hole (Drill the idle adjustment jet hole).
I found in the quadra jet performance write ups the idle adjustment jets were incredibly small and causing lean conditions. The cold start conditions shhould be resolved with this mod. I did for now back out the idle screw quite a bit and it does cold start better.

Next set of spark plugs will be one range cooler and gapped smaller.

08-15-2010, 09:20 AM	#1
big10ratrod77 Registered User Join Date: Aug 2009 Location: hillborough nc Posts: 410	need some help from the inline six guys well i got my 79 home yesterday put like 30 miles on it yesterday driving it around on my short road well its got a few minor porblems the choke dosent work and its hard starting first thing in the morning, the choke set up is an eletric choke on a rockchester verijet progressive 2bbl eny ideas how to solve that problem? the only other problem with it is that when you accelerate sometimes it hesitates and then revs up perty high. do yall think i need to do a rebuild on my carb? or is somthin just not adjusted right? thanks josh __________________ 77 chevy BIG 10 350/sm465/12bolt w 3.73 bout 240 horse power NO power steerin 79 chevy 1/2 ton 250/three on the tree/3.08s soon to get built 250/floor shift conversion/3.08s 81 mercedes 300d 25 MPG 77 chevy BIG DOOLEY 454/sm-465/14 bolt 4.10s "fully loaded" 73 plymouth duster 225 slant six/230 3 speed/8 1/4 trying to acheve 300 horse six http://www.cardomain.com/ride/3135091 '77 chevy trucks. built to stay tough. life is short build a hot rod

08-15-2010, 06:45 PM	#2
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: need some help from the inline six guys Stumble then rev is usually a bad accelerator pump. Time for a rebuild. As far as the choke, make sure it has power, trace the wiring circuit to be sure it is correct. Not sure about choke availability, last resort is a hand choke. Every now and then these show up on evilflay.... __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

08-15-2010, 07:48 PM	#3
1LowToy Registered User Join Date: Nov 2009 Location: Sonora California Posts: 860	Re: need some help from the inline six guys I have the same carb. They are set from the factory so horibly lean the need to warm up before you can drive it in colder weather. I've checked all the emissions equipment and so on, they just run lean. I've even had the smog guy from the state say my truck is horibly lean according to the emissions readings. Some say it's due to a cracked head between the intake and exhaust. I have not found a problem in mine like that at this point and have not seen it for myself. My carburator was loose at the base and from the base to the bowl before the rebuild. I have found there is a hose from the PCV valve that sets right above the exhaust manifold. Very hot area and yes it did have a hole in it. I rebuilt the carb, set the float level to spec. When/if I pull the carb off again i'm going to open up the idle jet hole (Drill the idle adjustment jet hole). I found in the quadra jet performance write ups the idle adjustment jets were incredibly small and causing lean conditions. The cold start conditions shhould be resolved with this mod. I did for now back out the idle screw quite a bit and it does cold start better. Next set of spark plugs will be one range cooler and gapped smaller. Last edited by 1LowToy; 08-15-2010 at 08:08 PM.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.