rochester quadrajunk? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

krazy_texan · 03-14-2005, 02:06 PM

it is on a 1979 305 that is actually in an elcamino but should not be any different than a truck i am assuming. this piece of crap that has been dubbed a carburetor will not work worth a crap, we rebuilt it about a week ago and we cannot get it tuned it has been running like crap and today it wont even start and backfires really bad through the tailpipes and everyonce in a while through the carb but not very much i dont know what to do but i am thinking of putting a new carb on this thing anyways as we have been talking about it for a long time but i would still like to be educated on these carbs.

Esteban86K5 · 03-14-2005, 02:38 PM

A quality rebuild is worth it IMO. My truck will literally run on it's side and the only reason it died was becasue i had so little gas in the tank the pick-up was no longer submerged. Mine was rebuilt by Jet Performance. Definately worth it.

Here us the link to the video in case you don't believe me.

Road Virus · 03-14-2005, 05:15 PM

Here is an excellent book on Rochester Quadrajet Carbs.

http://www.amazon.com/exec/obidos/AS...243249-5535051

pedrofixlater · 03-14-2005, 05:59 PM

Dude you have more than a carb problem listen to your engine back firing and also coming through the carb. the carb may be bad but sounds like you got bigger problems than the carb 305's are famous for bad cams. timing

stepside454 · 03-14-2005, 08:48 PM

yep...the Q-jet may be owed an apologie . Ive seen more Q-jets get blamed for stuff LOL

krazy_texan · 03-14-2005, 10:36 PM

i am having a hard time beleiving that it could be a cam problem as the engine has less than 5000 miles on it and the transmission less than 500 both rebuilt and installed by shops but i will run that by my dad.

Esteban86K5 · 03-14-2005, 10:38 PM

Then have your quad rebuilt by a GOOD shop and see what happens.

*1FaastC10* · 03-14-2005, 11:50 PM

get some books, these carbs get a bad rap because they're a little tricky to tune, so most people automatically think they're junk, when in fact it is their own lack of knowledge that causes the vehicle to run bad.

jimfulco · 03-15-2005, 01:52 AM

Old saw: 90% of carburetor problems are in the ignition.

apstguy · 03-15-2005, 06:38 AM

I have this book - If you own a Quadrajet - you need this book.

Quote:

Originally Posted by Road Virus

Here is an excellent book on Rochester Quadrajet Carbs.

http://www.amazon.com/exec/obidos/AS...243249-5535051

white82 · 03-15-2005, 08:56 AM

sounds like either a ignition problem or float set 2 high or booth if the float is set 2 hight it will suck up in the 4 barrel ventura and cause it to sound like it has a massave cam in it and then it starts the poping process where the plugs are getting raw fuel dripping on them

1985K10 · 03-15-2005, 06:38 PM

I was having the same problem with a junk Holley carb. What did I do? Bought a Edelbrock, did it fix the problem? NO! I set the timing right and not one more backfire.

Could be the carb, but it wouldnt hurt to check the timing.

krazy_texan · 03-17-2005, 11:18 PM

i am going to officially going to appologize for calling a quadrajunk because i had a friend come and tune it and now it runs like a spotted but ape now, so i guess i am going to get a book and do my homework

Esteban86K5 · 03-17-2005, 11:27 PM

Glad to hear that you found you problem.

white82 · 03-17-2005, 11:28 PM

glad u got it in tune as i been going through the same thing this week but my was a worn out dirttrack carb that was leaking at the butterfly plate. i put another one i had lying around after i cleaned it up it was flooding so i tore it apart once more and discovered the float was takeing in gas. i put in a new float did some tuneing and man what a difference!!!

mhicks · 03-18-2005, 09:34 AM

If you need another one rebuilt take over to Hudson Oaks. In Diamond Oaks housing development there is a man by the name of Larry Wells. He is supposably the best there is when it comes to Quadrajets. People ship them to him from all over the US. His company is Wells Speed Equipment. He is at 312 Diamond Oaks Drive and is number is 599-3600. I have used him several times and he is good.

03-14-2005, 02:06 PM	#1
krazy_texan Registered User Join Date: Oct 2002 Location: West Des Moines, Ia Posts: 3,233	rochester quadrajunk? it is on a 1979 305 that is actually in an elcamino but should not be any different than a truck i am assuming. this piece of crap that has been dubbed a carburetor will not work worth a crap, we rebuilt it about a week ago and we cannot get it tuned it has been running like crap and today it wont even start and backfires really bad through the tailpipes and everyonce in a while through the carb but not very much i dont know what to do but i am thinking of putting a new carb on this thing anyways as we have been talking about it for a long time but i would still like to be educated on these carbs. __________________ Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO

03-14-2005, 02:38 PM	#2
Esteban86K5 Registered User Join Date: Oct 2003 Location: Bakersfield Posts: 133	A quality rebuild is worth it IMO. My truck will literally run on it's side and the only reason it died was becasue i had so little gas in the tank the pick-up was no longer submerged. Mine was rebuilt by Jet Performance. Definately worth it. Here us the link to the video in case you don't believe me. __________________ Be American Buy American My Pics

03-14-2005, 05:15 PM	#3
Road Virus Registered User Join Date: Feb 2005 Location: Edmonton, AB, Canada Posts: 19	Here is an excellent book on Rochester Quadrajet Carbs. http://www.amazon.com/exec/obidos/AS...243249-5535051 __________________ 1987 GMC 3/4ton 4x4 (new daily driver) 1997 Chevy 1/2ton 2wd (soon to be for sale) 1984 Hurst Olds with T-tops (project) 1981 Olds Cutlass (future project) My Homepage

03-14-2005, 05:59 PM	#4
pedrofixlater 75 STEPSIDE Join Date: Mar 2005 Location: Suffolk, VA Posts: 92	Dude you have more than a carb problem listen to your engine back firing and also coming through the carb. the carb may be bad but sounds like you got bigger problems than the carb 305's are famous for bad cams. timing __________________ Pete 75 Chevy Stepside 70 Buick Skylark/GS

03-14-2005, 08:48 PM	#5
stepside454 Registered User Join Date: Nov 2003 Location: st. louis area Posts: 1,551	yep...the Q-jet may be owed an apologie . Ive seen more Q-jets get blamed for stuff LOL __________________ 75 GMC C-15 short/step factory 454, lowered

03-14-2005, 10:36 PM	#6
krazy_texan Registered User Join Date: Oct 2002 Location: West Des Moines, Ia Posts: 3,233	i am having a hard time beleiving that it could be a cam problem as the engine has less than 5000 miles on it and the transmission less than 500 both rebuilt and installed by shops but i will run that by my dad. __________________ Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO

03-14-2005, 10:38 PM	#7
Esteban86K5 Registered User Join Date: Oct 2003 Location: Bakersfield Posts: 133	Then have your quad rebuilt by a GOOD shop and see what happens. __________________ Be American Buy American My Pics

03-14-2005, 11:50 PM	#8
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,400	get some books, these carbs get a bad rap because they're a little tricky to tune, so most people automatically think they're junk, when in fact it is their own lack of knowledge that causes the vehicle to run bad.

03-15-2005, 01:52 AM	#9
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	Old saw: 90% of carburetor problems are in the ignition.

03-15-2005, 08:56 AM	#11
white82 White 82 Join Date: Feb 2004 Location: Eustace, Texas Posts: 100	sounds like either a ignition problem or float set 2 high or booth if the float is set 2 hight it will suck up in the 4 barrel ventura and cause it to sound like it has a massave cam in it and then it starts the poping process where the plugs are getting raw fuel dripping on them __________________ 1966 GTO 455 e-heads, 1982 Chevy k10 4'' lift 33’' tires, 2008 Pontiac g6 v6

03-15-2005, 06:38 PM	#12
1985K10 Registered User Join Date: Oct 2003 Location: CT Posts: 315	I was having the same problem with a junk Holley carb. What did I do? Bought a Edelbrock, did it fix the problem? NO! I set the timing right and not one more backfire. Could be the carb, but it wouldnt hurt to check the timing. __________________ Anthony 07 Tahoe LT 70 Chevelle 450HP 383-TH400 77 GMC Royal Sierra~Resto in progress~

03-17-2005, 11:18 PM	#13
krazy_texan Registered User Join Date: Oct 2002 Location: West Des Moines, Ia Posts: 3,233	i am going to officially going to appologize for calling a quadrajunk because i had a friend come and tune it and now it runs like a spotted but ape now, so i guess i am going to get a book and do my homework __________________ Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO

03-17-2005, 11:27 PM	#14
Esteban86K5 Registered User Join Date: Oct 2003 Location: Bakersfield Posts: 133	Glad to hear that you found you problem. __________________ Be American Buy American My Pics

03-17-2005, 11:28 PM	#15
white82 White 82 Join Date: Feb 2004 Location: Eustace, Texas Posts: 100	glad u got it in tune as i been going through the same thing this week but my was a worn out dirttrack carb that was leaking at the butterfly plate. i put another one i had lying around after i cleaned it up it was flooding so i tore it apart once more and discovered the float was takeing in gas. i put in a new float did some tuneing and man what a difference!!! __________________ 1966 GTO 455 e-heads, 1982 Chevy k10 4'' lift 33’' tires, 2008 Pontiac g6 v6

03-18-2005, 09:34 AM	#16
mhicks Registered User Join Date: Jan 2004 Location: Weatherford,Tx Posts: 747	If you need another one rebuilt take over to Hudson Oaks. In Diamond Oaks housing development there is a man by the name of Larry Wells. He is supposably the best there is when it comes to Quadrajets. People ship them to him from all over the US. His company is Wells Speed Equipment. He is at 312 Diamond Oaks Drive and is number is 599-3600. I have used him several times and he is good.



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