Slant *        6        Forum
Home Home Home
The Place to Go for Slant Six Info!
Click here to help support the Slant Six Forum!
It is currently Mon Dec 02, 2024 9:26 am

All times are UTC-08:00




Post new topic  Reply to topic  [ 6 posts ] 
Author Message
 Post subject: After 190, it just dies
PostPosted: Thu Jul 21, 2005 2:44 pm 
Offline
EFI Slant 6
User avatar

Joined: Thu Jul 15, 2004 12:56 am
Posts: 496
Location: Los Angeles
Car Model:
the car runs great under 190, but i notice on these hot los angeles days that when it warms up and reaches about 190, it starts to idle rough and if i hit the gas it just dies... something with the fuel maybe?

i got home and opened the hood and put some wood under the tires and set it in drive, the engine idles rough as hell, but in park it's just like a baby

any thoughts on this?

_________________
70 Plymouth Valiant 4dr
Image


Top
   
 Post subject:
PostPosted: Thu Jul 21, 2005 3:28 pm 
Offline
Board Sponsor & Contributor

Joined: Thu Oct 31, 2002 5:39 pm
Posts: 24449
Location: North America
Car Model:
Could well be a faulty HIC valve on your carburetor. The HIC, or Hot Idle Compensator, is located on the driver's side of the carburetor behind a rectangular sheetmetal cover plate approximately 1/2" wide by 1" tall, and has a tapered pintle that covers a vacuum port inside its housing. A bimetallic strip normally forces this pintle against the port so no air is admitted. When the strip gets sufficiently hot, it flexes, pulling the pintle away from the port and admitting extra air. They were fitted to some 1970-up slant-6 carburetors, particularly those used with California emissions. These can over time go out of calibration, admitting too much extra air and upsetting the idle mixture. Even if the HIC is working correctly, if the base idle mixture is on the lean side, the extra air admitted by the HIC can push the mixture over the "too lean" edge—especially with California's oxygenated gasoline.

Other things to check include plain old ordinary heat-induced gasoline boiling (fix it This way) and heat-induced failure of the ignition coil—same goes for the electronic control unit if you're running electronic ignition.

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.

Image


Top
   
 Post subject:
PostPosted: Thu Jul 21, 2005 5:19 pm 
Offline
Board Sponsor
User avatar

Joined: Tue Jul 08, 2003 11:33 am
Posts: 2378
Location: Central GA
Car Model: Many & varied, including stock & hopped up /6's
Quote:
Could well be a faulty HIC valve on your carburetor.....
So it sounds like your car has a case of the HICcups.

D/W

_________________
Image
If it ain't broke, fix it!


Top
   
 Post subject:
PostPosted: Thu Jul 21, 2005 5:49 pm 
Offline
Board Sponsor & Contributor

Joined: Thu Oct 31, 2002 5:39 pm
Posts: 24449
Location: North America
Car Model:
Quote:
Quote:
Could well be a faulty HIC valve on your carburetor.....
So it sounds like your car has a case of the HICcups.
Careful, there, Dennis...you live in Georgia; some people might consider you a HIC!

-DS (is it Friday yet?)

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.

Image


Top
   
PostPosted: Thu Jul 21, 2005 7:10 pm 
Offline
Turbo EFI
User avatar

Joined: Sat Nov 29, 2003 5:45 pm
Posts: 1903
Location: Hamilton the STEEL CITY, ON
Car Model:
Quote:
the car runs great under 190, but i notice on these hot los angeles days that when it warms up and reaches about 190, it starts to idle rough and if i hit the gas it just dies... something with the fuel maybe?

i got home and opened the hood and put some wood under the tires and set it in drive, the engine idles rough as hell, but in park it's just like a baby

any thoughts on this?
Damn, you must have some tall gears in that Dart! :wink:

_________________
I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.


Top
   
 Post subject:
PostPosted: Fri Jul 22, 2005 6:57 am 
Offline
Turbo EFI
User avatar

Joined: Fri Jul 16, 2004 5:22 am
Posts: 1134
Location: Carrollton, TX
Car Model:
... or he just shifts at a 21,000 rpm redline... :)

VM


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 6 posts ] 

All times are UTC-08:00


Who is online

Users browsing this forum: Google [Bot] and 11 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited