Recurring hesitation problem. - Taurus Car Club of America : Ford Taurus Forum
Register Home Forums Active Topics Topic Finder Photos Members List Search Today's Posts Mark Forums Read Auto EscrowAuto Loans
TaurusClub.com is the premier Ford Taurus Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 12-01-2012, 08:10 PM   #1 (permalink)
Junior Member
 
Member Number: 26880
Join Date: Mar 2010
Visit: My Garage
Posts: 28
Trader Score: 0 reviews
Rep Power: 0
aussiedave has a little shameless behaviour in the past
Default Recurring hesitation problem.

I have been posting on this forum with this problem for over two years with this problem.
In that time I have cleaned or changed:-
air filter
Plugs, wires and distributor module
fuel filter
PVC valve
Cleaned IAC and Air flow sensors.
I think that's it...
The problem seems greatly improved each time I perform some operation, but not quite completely fixed.
Recently put it into the shop with another problem where the car wanted to stall in gear and stopped in traffic - turned out it was the PVC valve and they tell us they can't find the hesitation problem either.
Any further ideas would be appreciated.
ad.
aussiedave is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 12-01-2012, 08:49 PM   #2 (permalink)
Technical Advisor
 
behlinla's Avatar
 
Member Number: 14275
Join Date: Dec 2007
Location: Wisconsin
Chapter: Midwest
Drives: A blue car
Visit: My Garage
Posts: 7,524
Trader Score: 0 reviews
Rep Power: 81
behlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond repute
Default

More info please. Year and engine. When exactly do you have hesitation (from a stop, from cruise, from coasting closed throttle, etc). Is it above a certain RPM range? Check engine light ever on? Fuel trim info if you have it?
behlinla is offline   Reply With Quote Quick reply to this message
Old 12-01-2012, 09:28 PM   #3 (permalink)
Devoted Member
 
Lgbpop's Avatar
 
Member Number: 7489
Join Date: Mar 2006
Location: Fort Myers, Florida USA
Chapter: Southeast
Drives: '90 Taurus GL Wagon 3.0L; '65 Rambler Ambassador 990 convertible
Visit: My Garage
Posts: 3,303
Trader Score: 0 reviews
Rep Power: 48
Lgbpop has a brilliant futureLgbpop has a brilliant futureLgbpop has a brilliant future
Default

Check your vacuum lines, one at a time, for dry rot and/or cracks and pinholes. Also check the vacuum storage tanks buried inside the outer front fenders. That's a general possible cause for hesitation, rough idle and stalling - certainly not the only cause, but worth doing as preventive maintenance at the very least. I started out checking each of mine, then just decided to systematically replace the lines with all new hose and tubing. Each one I track down and replace results in smoother idle.
Lgbpop is offline   Reply With Quote Quick reply to this message
Old 12-01-2012, 10:35 PM   #4 (permalink)
Junior Member
 
Member Number: 26880
Join Date: Mar 2010
Visit: My Garage
Posts: 28
Trader Score: 0 reviews
Rep Power: 0
aussiedave has a little shameless behaviour in the past
Default

Quote:
Originally Posted by behlinla View Post
More info please. Year and engine. When exactly do you have hesitation (from a stop, from cruise, from coasting closed throttle, etc). Is it above a certain RPM range? Check engine light ever on? Fuel trim info if you have it?
'03 3.0L, not duratec. Problem happens after stopping in traffic in idle. Problem caused check engine light to come on but reset after replacing PVC valve.
If I push the gas pedal hard, that is when the hesitation is most noticeable.
Thanks.
ad.

Last edited by aussiedave; 12-01-2012 at 10:38 PM.
aussiedave is offline   Reply With Quote Quick reply to this message
Old 12-01-2012, 11:00 PM   #5 (permalink)
Sam
breeves002
 
Sam's Avatar
 
Member Number: 49890
Join Date: Sep 2012
Location: St. Louis, MO
Chapter: Midwest
Drives: 2008 Mercury Sable Premier
Visit: My Garage
Posts: 6,124
Trader Score: 8 reviews
Rep Power: 68
Sam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond repute
Default

Check engine light isn't on? Did you just clear the codes? They could still be there. What were the codes? Does the CEL flash when you have this hesitation?
__________________
Sam

2008 Mercury Sable Premier
2012 Kia Soul Base AT 1.6GDI
2004 Acura TSX 2.4
Moved On: 2000 Sable LS Premium Duratec
Sam is offline   Reply With Quote Quick reply to this message
Old 12-01-2012, 11:04 PM   #6 (permalink)
Technical Advisor
 
behlinla's Avatar
 
Member Number: 14275
Join Date: Dec 2007
Location: Wisconsin
Chapter: Midwest
Drives: A blue car
Visit: My Garage
Posts: 7,524
Trader Score: 0 reviews
Rep Power: 81
behlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond repute
Default

2003 OHV engine. Got it.

I would start by checking the fuel pressure. You'll have to do this with a scan tool. Check the pressure at idle, at 2000 RPM (or while driving), and monitor it while doing a throttle snap. Fuel pressure should appear to remain the same level on the scan tool. Now remove the vacuum hose from the fuel pressure sensor and repeat the throttle snap test. Fuel pressure should not drop significantly.

How long ago was PCV valve changed and codes reset?

Last edited by behlinla; 12-02-2012 at 08:49 AM. Reason: No fuel Schrader valve on your car (thanks Jeff)
behlinla is offline   Reply With Quote Quick reply to this message
Old 12-02-2012, 01:10 AM   #7 (permalink)
Junior Member
 
Member Number: 26880
Join Date: Mar 2010
Visit: My Garage
Posts: 28
Trader Score: 0 reviews
Rep Power: 0
aussiedave has a little shameless behaviour in the past
Default

Quote:
Originally Posted by Breeves002 View Post
Check engine light isn't on? Did you just clear the codes? They could still be there. What were the codes? Does the CEL flash when you have this hesitation?
The repair shop must have cleared the codes and I don't know what they were - the missus picked the car up - she mentioned something about fuel mixture.
Not sure about the CEL flashing - wife didn't mention it.
Sorry I couldn't be more helpful.
ad.
aussiedave is offline   Reply With Quote Quick reply to this message
Old 12-02-2012, 08:35 AM   #8 (permalink)
Technical Advisor
 
Member Number: 11378
Join Date: Feb 2007
Location: Milwaukee, WI
Visit: My Garage
Posts: 5,024
Trader Score: 0 reviews
Rep Power: 63
Jeff K has a reputation beyond reputeJeff K has a reputation beyond reputeJeff K has a reputation beyond reputeJeff K has a reputation beyond repute
Default

03 is a returnless fuel system, and there is no schraeder valve on the rail for checking fuel press with a gauge. You need a scan tool to get pressure reading from the rail press / temp sensor. That is if you believe the sensor reading!
__________________
05 Taurus SEL Duratec - my daily driver
04 Taurus SES Duratec - wifes car
95 Taurus GL Vulcan winter car
Toy #1 - 86 Tbird 5.0 (original owner) - LOTS of mods
Toy #2 - 88 Tbird Turbo Coupe - LOTS of mods
02 Pontiac Grand Prix GT
67 Honda 450 Super Sport - completely customized
Jeff K is offline   Reply With Quote Quick reply to this message
Old 12-02-2012, 11:21 AM   #9 (permalink)
Junior Member
 
Member Number: 26880
Join Date: Mar 2010
Visit: My Garage
Posts: 28
Trader Score: 0 reviews
Rep Power: 0
aussiedave has a little shameless behaviour in the past
Default

Quote:
Originally Posted by behlinla View Post
2003 OHV engine. Got it.

I would start by checking the fuel pressure. You'll have to do this with a scan tool. Check the pressure at idle, at 2000 RPM (or while driving), and monitor it while doing a throttle snap. Fuel pressure should appear to remain the same level on the scan tool. Now remove the vacuum hose from the fuel pressure sensor and repeat the throttle snap test. Fuel pressure should not drop significantly.

How long ago was PCV valve changed and codes reset?
PCV replaced and CEL reset was 1 week ago.
Thnx.
ad.
aussiedave is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply


Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Taurus Car Club of America : Ford Taurus Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
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.



Thread Tools

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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 03:37 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.3.2