![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
|
![]()
i had some new exhaust ran today to quite it down some(for me and my neighbors) i got dual magnaflows, with the exhaust dumped AFTER the axle. sounds nice and mellow at idle and screams when i get on it. it runs a lot better too. my dad took it to a performance shop in mustang, while i was at school, and they said that they couldnt time the engine correctly because the carb was so way off. they said it was idleing too high(which it has been). also, the idle mixture screws are messed up, they do not effect it at all. no matter how much i turn it in or out, i know i can drill the holes out, but, i shouldnt have too. the idle speed screw is also crossthreaded, it came that way when i got it, and it is so hard to turn it in and out. this weekend i'll be borrowing an 800cfm edelbrock eps carb to see how it runs, and possibly sending the qjet back. i've been thinking of getting one of those holley street avenger carbs.
|
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Sep 2003
Location: Lewisville, NC
Posts: 1,836
|
is it running very rich also? I had a holley once that was messed up and the idle screws couldn't be adjusted to work right at all, sent it back and got another one and the replacement one work fine. Adjusting the idle screws all the way in should kill the motor, if not then something is wrong.
__________________
1985 Scottsdale Shortbed 4x4 Stout 350 with some "upgrades"-700r4-33x12.5" Mud Tires, Warn 8274-50 winch. 2005 Chevrolet Colorado Regular Cab 2wd 4-banger, 5 speed, Street Pack with 3.73 axle. |
![]() |
![]() |
![]() |
#3 |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
|
it is running really rich. it smells like a lot of gas all the time. and i can turn the idle screws, both of them, all the way in and it will not kill the motor.
|
![]() |
![]() |
![]() |
#4 |
BeWarE tHe eViL CrAnkTOe!
Join Date: Oct 2002
Location: Yukon, OK
Posts: 3,605
|
So if it was broken when you got it...tell me again why you didnt send it back immediately??
__________________
~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - 1986 Chevy Custom SWB *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods ![]() www.cardomain.com/id/ramairdave AIM Screenname - Jester84 |
![]() |
![]() |
![]() |
#5 | |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
|
Quote:
![]() really though, i figured that it just wasnt tuned right and i could tinker with it to get it to work. |
|
![]() |
![]() |
![]() |
#6 |
Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
|
If its getting tooo much gas it will loose power. I would just try and get a replacement. If it still doesn't do what its supposed to then change to edelbrock or demon.
__________________
1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
![]() |
![]() |
![]() |
#7 |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
|
i was looking at those speed demon carbs. i've heard they are supposed to be pretty good.
|
![]() |
![]() |
![]() |
#8 |
www.73-87chevytrucks.com
![]() Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
|
If the meter screws are working, it make me think you have a vacuum leak. Partially cover the choke horn and see what happens.
Otherwise, I would send the carb back for replacement if you don't find an answer.
__________________
Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com |
![]() |
![]() |
![]() |
#9 | |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
|
Quote:
|
|
![]() |
![]() |
![]() |
#10 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
|
Well, if covering the air horn with your hand doesn't kill the engine, you have a vacuum leak. This would explain a high speed miss also.
|
![]() |
![]() |
![]() |
#11 |
www.73-87chevytrucks.com
![]() Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
|
Ditto, you have a LARGE vacuum leak hiding somewhere. That is why the mixture screws are ineffective. You can only control air going through the carb
![]() ![]()
__________________
Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com |
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Oct 2002
Location: Phoenix, Arizona
Posts: 4,703
|
One way to find the leak:
You can spray something flamable around the intake (or other places you think might be leaking) and the engine speed will change when you spray where the leak is. Carb cleaner works well.
__________________
* AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION * |
![]() |
![]() |
![]() |
#13 |
Account Suspended
Join Date: Oct 2002
Location: Elkhart, IN
Posts: 6,400
|
you could also have an internal vac leak inside the engine. usually happens on the lower part of the intake seals when it does happen.
|
![]() |
![]() |
![]() |
#14 |
Mudslides 'r my specialty
Join Date: Dec 2003
Location: STL
Posts: 1,106
|
Don't you have to disconnect some vacuum lines while adjusting the idle screws (or it doesn't do anything)?
__________________
Always on the lookout for old cars and parts...(20s, 30s, 40s, 50s, 60s, etc.) http://www.cardomain.com/memberpage/500339 |
![]() |
![]() |
![]() |
#15 | |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
|
Quote:
|
|
![]() |
![]() |
![]() |
#16 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
|
Did you cap your hand over the air horn on the carb??
|
![]() |
![]() |
![]() |
#17 | |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
|
Quote:
|
|
![]() |
![]() |
![]() |
#18 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
|
Well??? What happened???
|
![]() |
![]() |
![]() |
#19 |
Registered User
Join Date: Sep 2003
Location: The Netherlands
Posts: 994
|
I'm not getting this, it's running way rich and you want to drill out the idle mixture passages?? Try restricting them with some short sections of steel wire dropped into them. I've had plenty of carbs that needed to be leaned out like that to get idling correctly. (holleys especially tend to suck out of the box)
|
![]() |
![]() |
![]() |
#20 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
|
Drilling out the idle discharge ports (idle mixture screw holes) does not make it richer. It gives it more air. You must remember the idle mixture screws control the amount of air not fuel.
|
![]() |
![]() |
![]() |
#21 |
Registered User
Join Date: Sep 2003
Location: The Netherlands
Posts: 994
|
oops... I have all lingo mixed up LOL
|
![]() |
![]() |
![]() |
#22 |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
|
okay, i just went and tried covering the air horn on the carb. i put a rag over the top and it started to die. when i pulled it off, it revved up quickly and settled back down. so that means no vacuum leak, right?
|
![]() |
![]() |
![]() |
#23 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
|
Right.
__________________
Mike 1985 Chevy C-10 |
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|