Hard Starting When Hot - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-23-2004, 08:55 PM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Mar 2004
Location: Melbourne, FL
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Harborcity is on a distinguished road
Default Hard Starting When Hot

Newby question,

I have a '96 SE with a little over 326,000 miles on her, starts fine when cold, but hard to start when driving for awhile. When I try to restart, it takes 5-6 tries before she will fire.

Any suggestions???
Harborcity is offline   Reply With Quote
Old 03-23-2004, 09:02 PM   #2
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

Crank sensor? If it is faulty, it will allow the car to start 1 out of 6 times, on average.
J Wikoff is offline   Reply With Quote
Old 03-23-2004, 10:36 PM   #3
Senior Member
Posts like a Turbo
 
Join Date: Sep 2003
Location: Halifax Nova Scotia ASE Master Service Tech
Posts: 376
Thanks: 0
Thanked 0 Times in 0 Posts
A Bonnie Canuck is on a distinguished road
Default

Every time when hot? Is it an extended crank before it will start? Do you have fuel pressure (check the schraeder valve on the rail)(Caution with a hot engine though, use a rag).

When the crank sensor is faulty it'* output will drop as it gets hotter until the point that it cannot open the zenor diodes within the ICM resulting in the car stalling and not starting again until it cools down.

First thing is finding out if it is fuel or spark that is not allowing it to start when hot. Have you checked for codes yet?
A Bonnie Canuck is offline   Reply With Quote
Old 03-23-2004, 10:41 PM   #4
Senior Member
True Car Nut
 
Join Date: Jun 2003
Location: Purgatory
Posts: 6,313
Thanks: 0
Thanked 0 Times in 0 Posts
PontiacDad is on a distinguished road
Default

By hot do you mean up to temp (normal) or hot as in over heated?
PontiacDad is offline   Reply With Quote
Old 03-23-2004, 11:32 PM   #5
Senior Member
True Car Nut
 
Join Date: Sep 2002
Location: Chicago, IL
Posts: 2,409
Thanks: 0
Thanked 1 Time in 1 Post
acg_ssei is on a distinguished road
Default

Quote:
Originally Posted by A Bonnie Canuck
Every time when hot? Is it an extended crank before it will start? Do you have fuel pressure (check the schraeder valve on the rail)(Caution with a hot engine though, use a rag).
Ahhh... This sounds like a leaking fuel pressure regulator. It doesn't leak to the outside; it leaks through its regulator diaphragm into the vacuum line, which cheerfully snorks up the gasoline and drowns its sensors, basically. It only does this on a hot restart since the pressurized fuel system pushes it through the hole; the system recovers (somehow) when the engine is cold, possibly because a cold start mode ignores sensor readings and squirts enough gas in to get started with a rich mixture no matter what.

So anyway, this is a quick easy check. With the engine off, locate the fuel-pressure regulator at one end of the fuel rail -- it'* a little round canister with one vacuum line attached -- and just unplug the vacuum line. If it pees gasoline at you, it'* leaking. (It won't come blasting out, but have a rag nearby anyway.) If there'* any gas present in the vacuum port, replace the regulator and you're all set.
acg_ssei is offline   Reply With Quote
Old 03-24-2004, 11:20 AM   #6
Senior Member
Posts like a Camaro
 
Join Date: Dec 2003
Location: Massachusetts
Posts: 1,019
Thanks: 0
Thanked 0 Times in 0 Posts
CFoote is on a distinguished road
Default

Andy stupid question.....can you replace the fuel pressure reguatlor without depressurizing the fuel system?
CFoote is offline   Reply With Quote
Old 03-24-2004, 11:37 AM   #7
Senior Member
Expert Gearhead
 
Join Date: Dec 2002
Location: Mississauga, Ontario
Posts: 20,892
Thanks: 0
Thanked 1 Time in 1 Post
Jim W is on a distinguished road
Default

No...open up the gas cap, located the schrader valive on your fuel rail, remove that cap, get a rag and a sharp tip instrument or tool. I used a mini Philips head screwdriver and push down on the nozzle. Cover it up with a cloth, fuel comes out of there at 35-40 psi
Jim W is offline   Reply With Quote
Old 03-24-2004, 01:02 PM   #8
Junior Member
 
Join Date: Mar 2003
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
vital49 is on a distinguished road
Default

326,000 on a an original Series II?!?!? That'* gotta be a record! Wonder how many upper intakes he'* gone through?!?! He can probably tell us who makes the best ones.
vital49 is offline   Reply With Quote
Old 03-24-2004, 02:14 PM   #9
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Mar 2004
Location: Melbourne, FL
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Harborcity is on a distinguished road
Default

Thanks for the tips.......Still original intake, but after reading the forum.........i'm a little nervous.......
Harborcity is offline   Reply With Quote
Old 03-24-2004, 10:02 PM   #10
Senior Member
True Car Nut
 
Join Date: Sep 2002
Location: Chicago, IL
Posts: 2,409
Thanks: 0
Thanked 1 Time in 1 Post
acg_ssei is on a distinguished road
Default

Quote:
Originally Posted by CFoote
Andy stupid question.....can you replace the fuel pressure reguatlor without depressurizing the fuel system?
As the others have said, No.

Of course, if the problem is a leaking pressure regulator, you won't _have_ pressure in the fuel system. Har!

So anyway, did you do the vacuum port check as I described, and find gasoline in there, or what?
acg_ssei is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
hot hot hot jhill52788 1992-1999 2 07-07-2007 06:18 PM
HOT blonde drives HOT Ferrari (video risky) 00indyssei Lounge 18 07-31-2005 07:44 PM
HOT HOT HOT! BonneMeMN Lounge 22 06-25-2005 12:46 AM
How hot is too hot? egladman 1992-1999 12 07-19-2004 12:42 AM
Feelin Hot Hot Hot LittleHoov General GM Chat 10 08-07-2003 01:41 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:41 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.