2005 Pontiac Montana hard start when hot - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Pontiac When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-05-2011, 11:45 PM   #1
Retired Senior Admin

Expert Gearhead
Thread Starter
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default 2005 Pontiac Montana hard start when hot

So my wife has been complaining about her Montana having hard starts. This seems to only happen when hot, and you park it and lets say run in to the store then come right back out. Lets hear your thoughts on what it could be. I have not had a chance to look it over, but I'm thinking fuel pressure regulator.
Danthurs is offline   Reply With Quote
Old 03-05-2011, 11:49 PM   #2
Senior Member
Certified GM nut
 
SignOfZeta's Avatar
 
Join Date: Mar 2005
Location: New Milford, CT
Posts: 2,284
Thanked 16 Times in 13 Posts
SignOfZeta has a spectacular aura aboutSignOfZeta has a spectacular aura about
Default

You're probably right.

If that fails, bench-test the starter. In my experience, trouble cranking when hot is the first sign of failure.
SignOfZeta is offline   Reply With Quote
Old 03-05-2011, 11:53 PM   #3
Retired Senior Admin

Expert Gearhead
Thread Starter
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

It cranks just fine, just doesn't like to fire. Only seems to do it after a short time not running. If it'd parked for a few hours then no problem. I suspect the FPR is leaking gas into the vacuum line.
Danthurs is offline   Reply With Quote
Old 03-05-2011, 11:56 PM   #4
Senior Member
Certified GM nut
 
SignOfZeta's Avatar
 
Join Date: Mar 2005
Location: New Milford, CT
Posts: 2,284
Thanked 16 Times in 13 Posts
SignOfZeta has a spectacular aura aboutSignOfZeta has a spectacular aura about
Default

You know the drill, Dan: pull the FPR vacuum line and take a whiff.
SignOfZeta is offline   Reply With Quote
Old 03-05-2011, 11:58 PM   #5
Retired Senior Admin

Expert Gearhead
Thread Starter
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

That'* the plan.
Danthurs is offline   Reply With Quote
Old 03-12-2011, 09:58 PM   #6
Retired Senior Admin

Expert Gearhead
Thread Starter
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Well, I got a chance to look it over the other day. And there is no FPR. Well, why would this be easy, right?

So now I'm open to ideas. This is a 2005 3.5l Montana
Danthurs is offline   Reply With Quote
Old 03-12-2011, 10:01 PM   #7
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

EGR issue?

IAC? Hold throttle about 2% while cranking.
Mike is offline   Reply With Quote
Old 03-12-2011, 10:10 PM   #8
Retired Senior Admin

Expert Gearhead
Thread Starter
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

I'll have to take a peek at that. The EGR is easy enough to test. This only seems to happen after the engine is up to temp. You go to a store, shut it off, run in, buy something come out and it will crank with no start. Might take 4 times but will then start and run right. This is why I was convinced it was a bad FPR. Was looking at the listed TSB for the truck and only thing I see is harmonic balancer not seated.
Danthurs is offline   Reply With Quote
Old 03-12-2011, 10:13 PM   #9
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Using a fuel pressure tester, will that tell you if a FPR is going bad?
Mike is offline   Reply With Quote
Old 03-12-2011, 10:16 PM   #10
Retired Senior Admin

Expert Gearhead
Thread Starter
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

This engine has no FPR. But to test a FPR you just pull the vacuum line and smell it. If you smell gas, it'* bad. A friend with a GP had the same exact problem with his car. Told him to pull the vacuum line, and the FPR was spraying gas. Bought a new FPR and problem was gone.
Danthurs is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
2006 Pontiac Montana Cold start issues PontiacWreck Pontiac 16 03-06-2015 04:50 PM
2004 Pontiac Montana - Hard Start When Hot, P0114, Temperature Sensor No Voltage-ECT MSU Pontiac 9 05-01-2014 01:54 AM
2005 Pontiac Montana 6-Button Remote coldfusion11 Pontiac 1 10-28-2011 03:54 PM
HOT HOT HOT! BonneMeMN Lounge 22 06-25-2005 12:46 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 08:11 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.