Car won't start- change in weather? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 09-12-2006, 09:11 AM
Registered User
 
Last photo:
Join Date: Dec 2005
Location: Charleston, SC
Posts: 65
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Car won't start- change in weather?

My '72 Pontiac Luxury LeMans has the stock 350 engine with stock rochester 2-bbl and TH350 trans. Although it often doesn't start right away, this morning it didnt start at all. All this summer, with several days of realfeel 105F in a row, the car never failed to start.

I don't know if its because we had our first cool morning in months or what?

I cleaned up the posts on the battery, getting plenty of juice, and the starter cranks fine, engine just won't catch. I don't know if my wife may have flooded it, but starter fluid didnt do the trick as it normally would. I'm pretty sure I'm getting gas coming from the carb...

A few months ago, I changed the vacuum advance on the mid-70's HEI to an adjustable advance unit. Does this thing have to be dialed differently for cooler weather?

Any ideas on whats happening? Bad fuel pump? Choke not engaged or working properly?

Please help, this is my wife's daily driver- I had to borrow a neighbor's truck this morning.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-12-2006, 09:30 AM
Rambo_The_Dog's Avatar
Registered User
 

Last journal entry: Shop Remodel Progress
Join Date: Dec 2005
Location: Pacific Northwest
Posts: 736
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by A-BodyFan
My '72 Pontiac Luxury LeMans has the stock 350 engine with stock rochester 2-bbl and TH350 trans. Although it often doesn't start right away, this morning it didnt start at all. All this summer, with several days of realfeel 105F in a row, the car never failed to start.

I don't know if its because we had our first cool morning in months or what?

I cleaned up the posts on the battery, getting plenty of juice, and the starter cranks fine, engine just won't catch. I don't know if my wife may have flooded it, but starter fluid didnt do the trick as it normally would. I'm pretty sure I'm getting gas coming from the carb...

A few months ago, I changed the vacuum advance on the mid-70's HEI to an adjustable advance unit. Does this thing have to be dialed differently for cooler weather?

Any ideas on whats happening? Bad fuel pump? Choke not engaged or working properly?

Please help, this is my wife's daily driver- I had to borrow a neighbor's truck this morning.
Are you getting a spark to the plugs?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-12-2006, 09:32 AM
Jmark's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2003
Location: phoenix
Age: 61
Posts: 4,786
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
You need to verify that it IS getting gas when you push the pedal. If you are, check for spark when cranking. If you are NOT getting spark, or getting a very weak (orangeish/yellow), you need to find the problem. Also, on the older HEI dist's, I used to see the pickup wires break over time due to the vac advance pulling and releasing a few million times. What usually happened then, was it would run ok at idle and cruise but cut out completely as soon as the vac advance pulled the pickup around during a hard acceleration. The circuit would break and kill the ignition.

Going to take some methodical checking and just start with the basics, gas and spark. Might want to pull a few plugs and see if they are soaked too, carb could have taken a dump too.

Mark
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-12-2006, 09:45 AM
Member
 
Last photo:
Join Date: Nov 2002
Location: BC Canada
Posts: 243
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
If it ran fine all summer the chances are that it is not something broke. The first thing I would do after checking the plugs for gas foul, try to start it and if it doesn't start fairly quickly, take the air cleaner off and have a look where the choke is. If its closed completely, stick something metal in there to prop the choke open a bit and try to start again. I have found quite often with old worn chokes, if they start good in summer, the first cool they close too much and won't start and as it gets colder they will work again. Also there is usually a summer\winter on the spring cover. Try dialing that to get it to work. These checks at least don't cost anything.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-12-2006, 02:30 PM
T-bucket23's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Engine basic condition - how to check Last photo:
Join Date: Aug 2005
Location: Massachusetts
Age: 56
Posts: 5,084
Wiki Edits: 26

Thanks: 7
Thanked 100 Times in 86 Posts
Probably the choke. If you pump and release the pedal the choke should be closed tight. As soon as the car starts the vacuum pull off will open it up enough to let a little air in until it warms up.
Check the choke first, it is the most likely problem related to temperature. it it appears to be functioning properly then check for spark and fuel.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-12-2006, 06:41 PM
66Caprice's Avatar
Move It On Over!
 
Last photo:
Join Date: Jun 2004
Location: Tucson, AZ
Age: 54
Posts: 227
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I would check for spark first before looking at fuel issues. If you're not getting spark, the HEI ignition module could be bad.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 09-13-2006, 10:12 AM
Registered User
 
Last photo:
Join Date: Dec 2005
Location: Charleston, SC
Posts: 65
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Well, turns out it was all in the choke technique. As in choking my wife for not adjusting her technique for starting the car!!!!

I was left with a flooded mess and little time. Not really her fault, she's not one bit mechanically inclined, just likes to look cool driving vintage rides.

Anyway, I cleaned up the battery terminals, checked out the choke linkage/ cleaned it up a little, and instructed the little lady on how to set the choke on chilly mornings. I only wish I had had the time and battery juice to continue with the trouble-shooting yesterday morning.

Thanks to all who responded. I love it when its the easiest fix first!
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Painting roof tips needed..... Bluepen Body - Exterior 7 09-10-2005 09:26 PM
car won't start please help SBC S-10 Engine 4 08-11-2005 08:42 PM
change modular car will start shut off and won't start back up Ramman Engine 1 11-26-2004 08:20 PM
Need color/top ideas.... Cracker Red Body - Exterior 4 09-07-2004 08:14 PM


All times are GMT -6. The time now is 07:31 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.