02 Bonneville hard to start - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Thread Tools Search this Thread
Old 02-26-2008, 12:51 AM   #1
Junior Member
Thread Starter
Join Date: Feb 2008
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
87National is on a distinguished road
Default 02 Bonneville hard to start

This is kind of a unique problem that popped up recently. It starts just fine first thing in the morning or after work...etc. when it has been parked for a few hours. However, when I drive a short distance then shut it off and try to start it again, it will turn over but not want to start unless I feather the gas a little. Any idea what is going on here? Again it only happens when I start it cold, drive a few blocks, shut it down and then try to start it again.
87National is offline   Reply With Quote
Old 02-26-2008, 09:16 AM   #2
Junior Member
Posts like a Ricer Type-R
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road

Classic symptoms of a leaky fuel pressure regulator. As the car starts to cool after shutdown, manifold vacuum pulls fuel through the vacuum line past the leaking diaphram of the regulator, and the fuel pools in the manifold.

Your next start will be rich for this reason. Feathering the throttle allows enough air to come in to compensate for the extra fuel. Try holding the throttle to the floor (this disables the injectors) and crank a couple times for a couple seconds to clear out that fuel and start again to see if that helps.

After driving, pull the vacuum line off the FPR on your fuel rail and smell it. If it smells like fuel (it shouldn't at all) replace it.

That'* the first thing that comes to mind.
willwren is offline   Reply With Quote
Old 02-26-2008, 11:58 AM   #3
Posts like a V-Tak
Join Date: Aug 2007
Posts: 82
Thanks: 0
Thanked 0 Times in 0 Posts
fbody69 is on a distinguished road

I agree... the fuel pressure regulator could be the problem. I had the same problem but it wasn't the fuel reg itself. It was the plastic vacuum line that runs to the reg. It was cracked. I was just beginning to check out the reg and when I pulled the vacuum line off it the other end came right off too. It was cracked almost all the way through where it comes out of the supply. Fixed the line and I've been 'good to go' for 10000 miles...
fbody69 is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
4T65E hard shifting when driven hard pontiacandryan 1992-1999 14 06-29-2009 05:25 PM
96 Bonneville hard to start hermit4033 1992-1999 10 04-17-2007 11:28 AM
hard start after sitting 96 bonneville se 3800 motor integrator1 1992-1999 3 10-16-2006 10:18 PM
Carter AFB and Hard to start 64 Bonneville Germanyjon Classics (Star Chief and 1957 to 1986) 8 06-13-2005 10:52 PM
92 Bonne, Hard Start dspman67 1992-1999 14 04-09-2003 06:16 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 06:03 AM.

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.