The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-05-2010, 11:31 AM   #1
lovnthe70
Registered User
 
lovnthe70's Avatar
 
Join Date: Nov 2008
Location: Tempe, AZ
Posts: 181
New Carb Running hot at idle

so i put on a rebuilt carb its a qjet and i dialed it in to what seems to run pretty good, but ever since i put on this new carb my engine temp rises at idle when at stoplights and what not from about 190 to 200, and my temp switch is in the block just above the manifold so i think the temps read about 10 higher than they actually are, at least according to a digital temp reader. Is this normal? i am worried cause i live in phoenix where it gets hot as hell and if it is doing this in the winter i don’t want to see what happens when i am sitting at a stoplight and its 105 degrees out! does it sound like i am running to rich or lean on my fuel mixture or idle? Has also been sputtering and running for a few seconds after i turn it off....like its angry i am not going to drive it more! my idling oil pressure seems to fluctuate, sometimes its 30 sometimes its 40 then when i drive its up around 60-70. thanks for the help it is a newly rebuilt engine with about 700 miles on it.
__________________
1970 GMC- 454

DONT GIVE ME NO JIBBA JABBA!!!
lovnthe70 is offline   Reply With Quote
Old 02-05-2010, 01:16 PM   #2
77 350 Shorty Wide
Registered User
 
77 350 Shorty Wide's Avatar
 
Join Date: Dec 2006
Location: Yakima, WA
Posts: 325
Re: New Carb Running hot at idle

Good Morning,

Usually speaking an engine that continues to run after the ignition is turned off indicates ignition is too far advanced. Check your timing. Advanced to far can also affect engine temps. Bad gas and low octane can also contribute to this. God Bless, Terry
77 350 Shorty Wide is offline   Reply With Quote
Old 02-05-2010, 01:18 PM   #3
lovnthe70
Registered User
 
lovnthe70's Avatar
 
Join Date: Nov 2008
Location: Tempe, AZ
Posts: 181
Re: New Carb Running hot at idle

alright thanks ill look into that, didnt even consider it because i just set the timing about 2 weeks ago. So should i run 89 octane? i have been using 87.
__________________
1970 GMC- 454

DONT GIVE ME NO JIBBA JABBA!!!
lovnthe70 is offline   Reply With Quote
Old 02-05-2010, 01:21 PM   #4
prostreetC-10
My Carbon Footprint
 
prostreetC-10's Avatar
 
Join Date: Oct 2008
Location: Orygun
Posts: 5,527
Re: New Carb Running hot at idle

Almost guaranteed it's not the carb. too many other possibilities.
prostreetC-10 is offline   Reply With Quote
Old 02-05-2010, 01:22 PM   #5
lovnthe70
Registered User
 
lovnthe70's Avatar
 
Join Date: Nov 2008
Location: Tempe, AZ
Posts: 181
Re: New Carb Running hot at idle

i just figured the carb because that same day i didnt have any of these issues untill i swaped on the carb.
__________________
1970 GMC- 454

DONT GIVE ME NO JIBBA JABBA!!!
lovnthe70 is offline   Reply With Quote
Old 02-05-2010, 06:44 PM   #6
coloradosean2009
Registered User
 
coloradosean2009's Avatar
 
Join Date: Aug 2009
Location: Denver, CO
Posts: 291
Re: New Carb Running hot at idle

You have a vac leak. Check the carb gasket with a can of spray cleaner while the engine is running. If the idle changes, you have a leak.
__________________
__________________________________________

Sean
1972 C20
2005 4Runner

coloradosean2009 is offline   Reply With Quote
Old 02-05-2010, 06:54 PM   #7
lovnthe70
Registered User
 
lovnthe70's Avatar
 
Join Date: Nov 2008
Location: Tempe, AZ
Posts: 181
Re: New Carb Running hot at idle

Quote:
Originally Posted by coloradosean2009 View Post
You have a vac leak. Check the carb gasket with a can of spray cleaner while the engine is running. If the idle changes, you have a leak.
alright ill do that when i get home, i adjusted my idle at lunch and it stoped gurgeling and shaking after i shut it down so as far as i can tell i got that fixed for now. thanks.
__________________
1970 GMC- 454

DONT GIVE ME NO JIBBA JABBA!!!
lovnthe70 is offline   Reply With Quote
Reply

Bookmarks

Tags
idle, oil pressure, qjet, temperature


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 03:12 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com